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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2017	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Trading Symbol	KRO
Entity Registrant Name	KRONOS WORLDWIDE INC
Entity Central Index Key	0001257640
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		115,902,098

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 316.7	$ 50.7
Restricted cash	1.3	1.6
Accounts and other receivables	355.4	244.6
Inventories, net	335.3	343.5
Prepaid expenses and other	12.5	10.0
Total current assets	1,021.2	650.4
Other assets:
Investment in TiO2 manufacturing joint venture	75.1	78.9
Marketable securities	4.3	6.0
Deferred income taxes	120.0	8.1
Other	3.6	2.2
Total other assets	203.0	95.2
Property and equipment:
Land	41.4	37.3
Buildings	219.2	195.8
Equipment	1,074.2	947.4
Mining properties	118.8	108.1
Construction in progress	52.6	38.7
Gross property and equipment	1,506.2	1,327.3
Less accumulated depreciation and amortization	1,020.0	893.3
Net property and equipment	486.2	434.0
Total assets	1,710.4	1,179.6
Current liabilities:
Current maturities of long-term debt	0.1	3.6
Accounts payable and accrued liabilities	217.0	173.5
Income taxes	22.9	5.0
Total current liabilities	240.0	182.1
Noncurrent liabilities:
Long-term debt	467.5	335.4
Accrued pension cost	254.2	227.3
Accrued postretirement benefits cost	7.4	6.9
Deferred income taxes	8.9	10.5
Other	21.7	22.4
Total noncurrent liabilities	759.7	602.5
Stockholders' equity:
Common stock	1.2	1.2
Additional paid-in capital	1,399.0	1,398.8
Retained deficit	(297.3)	(552.2)
Accumulated other comprehensive loss	(392.2)	(452.8)
Total stockholders' equity	710.7	395.0
Total liabilities and stockholders' equity	1,710.4	1,179.6
Commitments and contingencies (Notes 11 and 13)

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 464.5	$ 356.1	$ 1,275.7	$ 1,030.6
Cost of sales	312.3	280.6	890.3	859.2
Gross margin	152.2	75.5	385.4	171.4
Selling, general and administrative expense	53.0	43.6	152.4	129.7
Other operating income (expense):
Currency transaction gains (losses), net	(4.3)	(1.0)	(8.0)	3.2
Other operating expense, net	(3.3)	(2.9)	(11.0)	(6.7)
Income from operations	91.6	28.0	214.0	38.2
Other income (expense):
Interest and dividend income	0.4	0.1	0.7	0.5
Loss on prepayment of debt, net	(7.1)		(7.1)
Interest expense	(5.0)	(5.2)	(14.5)	(15.4)
Income before income taxes	79.9	22.9	193.1	23.3
Income tax expense (benefit)	6.1	0.7	(114.0)	3.2
Net income	$ 73.8	$ 22.2	$ 307.1	$ 20.1
Net income per basic and diluted share	$ 0.64	$ 0.19	$ 2.65	$ 0.17
Cash dividends per share	$ 0.15	$ 0.15	$ 0.45	$ 0.45
Weighted average shares used in the calculation of net income per share	115.9	115.9	115.9	115.9

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 73.8	$ 22.2	$ 307.1	$ 20.1
Other comprehensive income (loss), net of tax:
Currency translation	29.9	9.0	53.7	18.4
Marketable securities	(0.6)	0.9	(1.2)	1.1
Interest rate swap	1.8	0.8	2.0	(2.9)
Total other comprehensive income, net	33.5	13.5	60.6	25.0
Comprehensive income	107.3	35.7	367.7	45.1
Defined Benefit Pension Plans
Other comprehensive income (loss), net of tax:
Defined benefit plans	$ 2.4	2.9	6.3	8.7
OPEB
Other comprehensive income (loss), net of tax:
Defined benefit plans		$ (0.1)	$ (0.2)	$ (0.3)

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings (deficit)	Accumulated other comprehensive loss
Beginning Balance at Dec. 31, 2015					$ (412.0)
Net income	$ 20.1
Other comprehensive income, net of tax	25.0
Ending Balance at Sep. 30, 2016					(387.0)
Beginning Balance at Jun. 30, 2016					(400.5)
Net income	22.2
Other comprehensive income, net of tax	13.5
Ending Balance at Sep. 30, 2016					(387.0)
Beginning Balance at Dec. 31, 2016	395.0	$ 1.2	$ 1,398.8	$ (552.2)	(452.8)
Net income	307.1			307.1
Other comprehensive income, net of tax	60.6				60.6
Issuance of common stock	0.2		0.2
Dividends paid	(52.2)			(52.2)
Ending Balance at Sep. 30, 2017	710.7	1.2	1,399.0	(297.3)	(392.2)
Beginning Balance at Jun. 30, 2017					(425.7)
Net income	73.8
Other comprehensive income, net of tax	33.5
Ending Balance at Sep. 30, 2017	$ 710.7	$ 1.2	$ 1,399.0	$ (297.3)	$ (392.2)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 307.1	$ 20.1
Depreciation and amortization	30.7	30.7
Deferred income taxes	(139.9)	(2.5)
Loss on prepayment of debt	7.1
Payment for termination of interest rate swap contract	(3.3)
Benefit plan expense greater than cash funding	9.2	4.2
Distributions from TiO2 manufacturing joint venture, net	3.8	3.1
Other, net	1.7	(0.3)
Change in assets and liabilities:
Accounts and other receivables	(77.0)	(36.9)
Inventories	39.9	81.1
Prepaid expenses	(1.5)	(3.3)
Accounts payable and accrued liabilities	43.8	(9.0)
Income taxes	15.3	1.6
Accounts with affiliates	(15.1)	(18.2)
Other, net	(3.5)	(1.9)
Net cash provided by operating activities	218.3	68.7
Cash flows from investing activities:
Capital expenditures	(40.7)	(34.3)
Net cash used in investing activities	(40.7)	(34.3)
Indebtedness:
Borrowings	731.5	209.9
Principal payments	(594.3)	(194.2)
Deferred financing fees	(8.3)
Dividends paid	(52.2)	(52.2)
Net cash provided by (used in) financing activities	76.7	(36.5)
Cash, cash equivalents and restricted cash - net change from:
Operating, investing and financing activities	254.3	(2.1)
Currency translation	11.4	1.1
Balance at beginning of period	52.3	94.3
Balance at end of period	318.0	93.3
Cash paid for:
Interest, net of amount capitalized	15.4	13.9
Income taxes	18.7	4.4
Accrual for capital expenditures	3.7	$ 4.8
Valhi
Cash flows from investing activities:
Loans	(2.8)
Collections	$ 2.8

Organization and Basis of Presentation	9 Months Ended
Organization and Basis of Presentation	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Basis of Presentation	Note 1 - Organization and basis of presentation: Organization - At September 30, 2017, Valhi, Inc. (NYSE: VHI) held approximately 50% of our outstanding common stock and a wholly-owned subsidiary of NL Industries, Inc. (NYSE: NL) held approximately 30% of our common stock, Valhi owned approximately 83% of NL’s outstanding common stock and a wholly-owned subsidiary of Contran Corporation held approximately 93% of Valhi’s outstanding common stock. All of Contran’s outstanding voting stock is held by a family trust established for the benefit of Lisa K. Simmons and Serena Simmons Connelly and their children, for which Ms. Simmons and Ms. Connelly are co-trustees, or is held directly by Ms. Simmons and Ms. Connelly or entities related to them. Consequently, Ms. Simmons and Ms. Connelly may be deemed to control Contran, Valhi, NL and us. Basis of presentation - The unaudited Condensed Consolidated Financial Statements contained in this Quarterly Report have been prepared on the same basis as the audited Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2016 that we filed with the Securities and Exchange Commission (SEC) on March 10, 2017 (2016 Annual Report). In our opinion, we have made all necessary adjustments (which include only normal recurring adjustments, other than the reversal of the deferred income tax asset valuation allowance recognized in the second quarter of 2017, as discussed in Note 11) in order to state fairly, in all material respects, our consolidated financial position, results of operations and cash flows as of the dates and for the periods presented. We have condensed the Consolidated Balance Sheet at December 31, 2016 contained in this Quarterly Report as compared to our audited Consolidated Financial Statements at that date, and we have omitted certain information and footnote disclosures (including those related to the Consolidated Balance Sheet at December 31, 2016) normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). Our results of operations for the interim periods ended September 30, 2017 may not be indicative of our operating results for the full year. The Condensed Consolidated Financial Statements contained in this Quarterly Report should be read in conjunction with our 2016 Consolidated Financial Statements contained in our 2016 Annual Report. Unless otherwise indicated, references in this report to “we,” “us” or “our” refer to Kronos Worldwide, Inc. and its subsidiaries (NYSE: KRO) taken as a whole.

Accounts and Other Receivables

9 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Accounts and Other Receivables

Note 2 - Accounts and other receivables:

	December 31,			September 30,
	2016			2017
	(In millions)
Trade receivables	$	224.8		$	326.8
Recoverable VAT and other receivables		16.7			16.1
Receivable from affiliates:
Income taxes, net - Valhi		.7			1.3
Louisiana Pigment Company, L.P.		-			9.3
Other		2.8			3.5
Refundable income taxes		.3			-
Allowance for doubtful accounts		(.7	)		(1.6	)
Total	$	244.6		$	355.4

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Inventories, Net

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Inventories, Net

Note 3 - Inventories, net:

	December 31,		September 30,
	2016		2017
	(In millions)
Raw materials	$	68.7	$	89.4
Work in process		22.3		17.8
Finished products		195.7		162.9
Supplies		56.8		65.2
Total	$	343.5	$	335.3

Marketable Securities

9 Months Ended

Sep. 30, 2017

Investments Debt And Equity Securities [Abstract]

Marketable Securities

Note 4 - Marketable securities:

Our marketable securities consist of investments in the publicly-traded shares of related parties: Valhi, NL and CompX International Inc. NL owns the majority of CompX’s outstanding common stock. All of our marketable securities are accounted for as available-for-sale securities, which are carried at fair value using quoted market prices in active markets for each marketable security, and represent a Level 1 input within the fair value hierarchy. See Note 14. Because we have classified all of our marketable securities as available-for-sale, any unrealized gains or losses on the securities are recognized through other comprehensive income, net of deferred income taxes.

	Fair value
	measurement	Market		Cost
Marketable security	level	value		basis		Unrealized gain
		(In millions)
December 31, 2016:
Valhi common stock	1	$	5.9	$	3.2	$	2.7
NL and CompX common stocks	1		.1		.1		-
Total		$	6.0	$	3.3	$	2.7

September 30, 2017:
Valhi common stock	1	$	4.2	$	3.2	$	1.0
NL and CompX common stocks	1		.1		.1		-
Total		$	4.3	$	3.3	$	1.0

At December 31, 2016 and September 30, 2017, we held approximately 1.7 million shares of Valhi’s common stock. We also held a nominal number of shares of CompX and NL common stocks. At December 31, 2016 and September 30, 2017, the quoted per share market price of Valhi’s common stock was $3.46 and $2.43, respectively.

The Valhi, CompX and NL common stocks we own are subject to the restrictions on resale pursuant to certain provisions of SEC Rule 144. In addition, as a majority-owned subsidiary of Valhi we cannot vote our shares of Valhi common stock under Delaware General Corporation law, but we do receive dividends from Valhi on these shares, when declared and paid.

Other Noncurrent Assets

9 Months Ended

Sep. 30, 2017

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Noncurrent Assets

Note 5 - Other noncurrent assets:

	December 31,		September 30,
	2016		2017
	(In millions)
Pension asset	$	.6	$	.9
Deferred financing costs, net		.4		.8
Other		1.2		1.9
Total	$	2.2	$	3.6

Long-Term debt

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Long-Term Debt

Note 6 - Long-term debt:

	December 31,		September 30,
	2016		2017
	(In millions)
Kronos International, Inc. 3.75% Senior Secured Notes	$	-	$	464.2
Term loan		335.9		-
Other		3.1		3.4
Total debt		339.0		467.6
Less current maturities		3.6		.1
Total long-term debt	$	335.4	$	467.5

Senior Secured Notes - On September 13, 2017, Kronos International, Inc. (“KII”), our wholly-owned subsidiary, issued €400 million aggregate principal amount of its 3.75% Senior Secured Notes due September 15, 2025 (the “Senior Notes”), at par value ($477.6 million when issued). We used $338.6 million of the net proceeds of the new Senior Notes to prepay in full the outstanding principal balance of our term loan (along with accrued and unpaid interest through the prepayment date) and $21.0 million to repay the outstanding balance under our North American revolving credit facility. The remaining net proceeds of the Senior Notes are available for our general corporate purposes. The new Senior Notes:

•

bear interest at 3.75% per annum, payable semi-annually on March 15 and September 15 of each year, beginning on March 15, 2018;

•

have a maturity date of September 15, 2025. Prior to September 15, 2020, we may redeem some or all of the Senior Notes at a price equal to 100% of the principal amount thereof, plus a “make-whole” premium (as defined in the indenture governing the Senior Notes). On or after September 15, 2020, we may redeem the Senior Notes at redemption prices ranging from 102.813% of the principal amount, declining to 100% on or after September 15, 2023. In addition, on or before September 15, 2020, we may redeem up to 40% of the Senior Notes with the net proceeds of certain public or private equity offerings at 103.75% of the principal amount. If we experience certain specified change of control events, we would be required to make an offer to purchase the Senior Notes at 101% of the principal amount. We would also be required to make an offer to purchase a specified portion of the Senior Notes at par value in the event that we generate a certain amount of net proceeds from the sale of assets outside the ordinary course of business, and such net proceeds are not otherwise used for specified purposes within a specified time period;

•

are fully and unconditionally guaranteed, jointly and severally, on a senior secured basis by Kronos Worldwide, Inc. and each of our direct and indirect domestic, wholly-owned subsidiaries;

•

are collateralized by a first priority lien on (i) 100% of the common stock or other ownership interests of each existing and future direct domestic subsidiary of KII and the guarantors, and (ii) 65% of the voting common stock or other ownership interests and 100% of the non-voting common stock or other ownership interests of each foreign subsidiary that is directly owned by KII or any guarantor;

•

contain a number of covenants and restrictions which, among other things, restrict our ability to incur or guarantee additional debt, incur liens, pay dividends or make other restricted payments, or merge or consolidate with, or sell or transfer substantially all of our assets to, another entity, and contain other provisions and restrictive covenants customary in lending transactions of this type (however, there are no ongoing financial maintenance covenants); and

•

contain customary default provisions, including a default under any of our other indebtedness in excess of $50.0 million.

The carrying value of the Senior Notes at September 30, 2017 is stated net of unamortized debt issuance costs of $7.4 million.

Term loan - During the first six months of 2017, we made our required quarterly term loan principal payments aggregating $1.8 million. Concurrent with the issuance of our Senior Notes, in September 2017, we voluntarily prepaid in full the outstanding $338.6 million principal balance of our term loan (and such term loan facility was terminated). As a result of such prepayment, we recognized a loss on prepayment of debt aggregating $7.1 million in the third quarter of 2017 consisting principally of (i) the write-off of unamortized debt issuance costs and original issue discount associated with the term loan of $2.7 million and $.7 million, respectively, and (ii) a charge of $3.3 million related to the early termination of our interest rate swap contract discussed in Note 14. Funds for the aggregate prepayment were provided by the net proceeds from the Senior Notes discussed above. The average interest rate on the term loan for the year-to-date period ended September 13, 2017 (the pay-off date) was 4.1%.

North American revolving credit facility - In January 2017, we extended the maturity date of our North American revolving credit facility to the earlier of (i) January 30, 2022 or (ii) 90 days prior to the maturity date of our then-existing term loan indebtedness (or 90 days prior to the maturity date of any indebtedness incurred in a permitted refinancing of such existing term loan indebtedness). The issuance of the Senior Notes is a permitted refinancing of our term loan, and accordingly, the maturity date of the North American revolving credit facility is January 30, 2022.

During the first nine months of 2017, we borrowed $253.9 million and repaid $253.9 million under our North American revolving credit facility. The average interest rate on outstanding borrowings for the year-to-date period ended September 13, 2017 when the outstanding balance was repaid was 4.8%. As discussed above, in September 2017 we used a portion of the net proceeds from the Senior Notes to repay our then-outstanding principal balance of $21.0 million. At September 30, 2017, we had approximately $100.0 million available for additional borrowing under this revolving credit facility.

European revolving credit facility - In September 2017, we amended our European revolving credit facility. The amendment extended the maturity date of the European revolving credit facility by five years to September 2022 and reduced the maximum amount we may borrow under the credit facility from €120 million to €90 million. In addition, the amendment reduced the interest rate on outstanding borrowings under this credit facility from the Euro Interbank Offered Rate (EURIBOR) plus 1.90% per annum to EURIBOR plus 1.60% per annum. Our European revolving credit facility requires the maintenance of certain financial ratios, and one of such requirements is based on the ratio of net debt to last twelve months earnings before income tax, interest, depreciation and amortization expense (EBITDA) of the borrowers. Based upon the borrowers’ last twelve months EBITDA as of September 30, 2017 and the net debt to EBITDA financial test, the full €90 million amount of the credit facility ($106.1 million) is available for borrowing at September 30, 2017.

Other - We are in compliance with all of our debt covenants at September 30, 2017.

Accounts Payable and Accrued Liabilities

9 Months Ended

Sep. 30, 2017

Payables And Accruals [Abstract]

Accounts Payable and Accrued Liabilities

Note 7 - Accounts payable and accrued liabilities:

	December 31,		September 30,
	2016		2017
	(In millions)
Accounts payable	$	84.9	$	116.8
Accrued sales discounts and rebates		20.9		25.7
Employee benefits		17.7		24.9
Reserve for uncertain tax positions		3.3		-
Interest rate swap contract		2.9		-
Accrued workforce reduction costs		1.2		.2
Payable to affiliate -
Louisiana Pigment Company, L.P.		14.7		12.2
Other		27.9		37.2
Total	$	173.5	$	217.0

See Note 14 for a discussion of the interest rate swap contract.

Other Noncurrent Liabilities

9 Months Ended

Sep. 30, 2017

Other Liabilities Disclosure [Abstract]

Other Noncurrent Liabilities

Note 8 - Other noncurrent liabilities:

	December 31,		September 30,
	2016		2017
	(In millions)
Reserve for uncertain tax positions	$	7.3	$	1.3
Employee benefits		7.8		8.4
Interest rate swap contract		.2		-
Other		7.1		12.0
Total	$	22.4	$	21.7

Employee Benefit Plans

9 Months Ended

Sep. 30, 2017

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

Note 9 - Employee benefit plans:

Defined benefit plans - The components of net periodic defined benefit pension cost are presented in the table below.

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Service cost	$	2.5		$	3.0		$	7.5		$	8.5
Interest cost		3.9			3.6			11.6			10.3
Expected return on plan assets		(3.9	)		(2.6	)		(11.6	)		(7.6	)
Amortization of prior service cost		.1			-			.2			.2
Recognized actuarial losses		2.9			3.5			8.9			10.0
Total	$	5.5		$	7.5		$	16.6		$	21.4

Postretirement benefits - The components of net periodic postretirement benefits other than pension (OPEB) cost are presented in the table below.

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Service cost	$	-		$	-		$	.1		$	.1
Interest cost		.1			.1			.2			.2
Amortization of prior service credit		(.2	)		(.1	)		(.6	)		(.4	)
Recognized actuarial losses		.1			-			.2			.1
Total	$	-		$	-		$	(.1	)	$	-

Contributions - We expect our 2017 contributions for our pension and other postretirement plans to be approximately $15 million.

Other Operating Income (Expense), Net	9 Months Ended
Other Operating Income (Expense), Net	Sep. 30, 2017
Other Operating Income Expense [Abstract]
Other Operating Income (Expense), Net	Note 10 - Other operating income (expense), net: Other operating income (expense), net in the first nine months of 2016 includes income of $3.4 million, recognized in the first and second quarters, related to cash received from settlement of a business interruption insurance claim arising in 2014. No additional material amounts are expected to be received with respect to such insurance claim.

Income Taxes

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Note 11 - Income taxes:

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Expected tax expense, at U.S. federal statutory income tax rate of 35%	$	8.1		$	28.0		$	8.2		$	67.6
Non-U.S. tax rates		(1.0	)		(3.4	)		(1.4	)		(8.2	)
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies		(.8	)		.2			(1.6	)		6.8
Valuation allowance		(.8	)		(7.8	)		2.1			(170.4	)
U.S. - Canada APA		(5.6	)		-			(5.6	)		-
Adjustment to reserve for uncertain tax positions, net		.4			(8.1	)		.6			(7.6	)
Nondeductible expenses		.3			.5			.7			1.1
Canada - Germany APA		-			(3.2	)		-			(3.2	)
U.S. state income tax and other, net		.1			(.1	)		.2			(.1	)
Income tax expense (benefit)	$	.7		$	6.1		$	3.2		$	(114.0	)

Comprehensive provision for income taxes allocable to:
Net income	$	.7		$	6.1		$	3.2		$	(114.0	)
Other comprehensive income (loss):
Currency translation		-			6.4			-			19.7
Marketable securities		.5			(.3	)		.6			(.6	)
Pension plans		.1			1.1			.4			3.2
OPEB plans		-			-			(.1	)		(.1	)
Interest rate swap		.4			1.0			(1.6	)		1.1
Total	$	1.7		$	14.3		$	2.5		$	(90.7	)

The amount shown in the above table of our income tax rate reconciliation for non-U.S. tax rates represents the result determined by multiplying the pre-tax earnings or losses of each of our non-U.S. subsidiaries by the difference between the applicable statutory income tax rate for each non-U.S. jurisdiction and the U.S. federal statutory tax rate of 35%. The amount shown on such table for incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies includes, as applicable, (i) current income taxes (including withholding taxes, if applicable), if any, associated with any current-year earnings of our non-U.S. subsidiaries to the extent such current-year earnings were distributed to us in the current year, (ii) deferred income taxes (or deferred income tax benefit) associated with the current-year change in the aggregate amount of undistributed earnings of our Canadian subsidiary, which earnings are not subject to a permanent reinvestment plan, in an amount representing the current-year change in the aggregate current income tax that would be generated (including withholding taxes, if applicable) when such aggregate undistributed earnings are distributed to us, and (iii) current U.S. income taxes (or current income tax benefit), including U.S. personal holding company tax, as applicable, attributable to current-year income (losses) of one of our non-U.S. subsidiaries, which subsidiary is treated as a dual resident for U.S. income tax purposes, to the extent the current-year income (losses) of such subsidiary is subject to U.S. income tax under the U.S. dual-resident provisions of the Internal Revenue Code.

We have substantial net operating loss (NOL) carryforwards in Germany (the equivalent of $638 million for German corporate purposes and $71 million for German trade tax purposes at December 31, 2016) and in Belgium (the equivalent of $93 million for Belgian corporate tax purposes at December 31, 2016), all of which have an indefinite carryforward period. As a result, we have net deferred income tax assets with respect to these two jurisdictions, primarily related to these NOL carryforwards. The German corporate tax is similar to the U.S. federal income tax, and the German trade tax is similar to the U.S. state income tax. Prior to June 30, 2015, and using all available evidence, we had concluded no deferred income tax asset valuation allowance was required to be recognized with respect to these net deferred income tax assets under the more-likely-than-not recognition criteria, primarily because (i) the carryforwards have an indefinite carryforward period, (ii) we utilized a portion of such carryforwards during the most recent three-year period, and (iii) we expected to utilize the remainder of the carryforwards over the long term. We had also previously indicated that facts and circumstances could change, which might in the future result in the recognition of a valuation allowance against some or all of such deferred income tax assets. However, as of June 30, 2015, and given our operating results during the second quarter of 2015 and our expectations at that time for our operating results for the remainder of 2015, we did not have sufficient positive evidence to overcome the significant negative evidence of having cumulative losses in the most recent twelve consecutive quarters in both our German and Belgian jurisdictions at June 30, 2015 (even considering that the carryforward period of our German and Belgian NOL carryforwards is indefinite, one piece of positive evidence). Accordingly, at June 30, 2015, we concluded that we were required to recognize a non-cash deferred income tax asset valuation allowance under the more-likely-than-not recognition criteria with respect to our German and Belgian net deferred income tax assets at such date. We recognized an additional non-cash deferred income tax asset valuation allowance during the second half of 2015 due to losses recognized by our German and Belgian operations during such period. During 2016, we recognized an aggregate $2.2 million non-cash tax benefit as the result of a net decrease in such deferred income tax valuation allowance, as the impact of utilizing a portion of our German NOLs during such period more than offset the impact of additional losses recognized by our Belgian operations during such period. Such valuation allowance aggregated approximately $173 million at December 31, 2016 ($153 million with respect to Germany and $20 million with respect to Belgium). During the first six months of 2017, we recognized an aggregate non-cash income tax benefit of $12.7 million as a result of a net decrease in such deferred income tax asset valuation allowance, due to the utilization of a portion of both the German and Belgian NOLs during such period. At June 30, 2017, we concluded we had sufficient positive evidence under the more-likely-than-not recognition criteria to support reversal of the entire valuation allowance related to our German and Belgian operations. Such sufficient positive evidence at June 30, 2017 included, among other things, the existence of cumulative profits in the most recent twelve consecutive quarters (Germany) or profitability in recent quarters during which such profitability was trending upward throughout such period (Belgium), the ability to demonstrate future profitability in Germany and Belgium for a sustainable period, and the indefinite carryforward period for the German and Belgian NOLs. As discussed below regarding accounting for income taxes at interim dates, a large portion ($149.9 million) of the remaining valuation allowance as of June 30, 2017 was reversed in the second quarter, with the remainder to be reversed during the second half of 2017 (including $7.8 million reversed in the third quarter).

In accordance with the ASC 740-270 guidance regarding accounting for income taxes at interim dates, the amount of the valuation allowance reversed at June 30, 2017 ($149.9 million, of which $141.9 million related to Germany and $8.0 million related to Belgium) relates to our change in judgment at that date regarding the realizability of the related deferred income tax asset as it relates to future years (i.e. 2018 and after). A change in judgment regarding the realizability of deferred tax assets as it relates to the current year is considered in determining the estimated annual effective tax rate for the year and is recognized throughout the year, including interim periods subsequent to the date of the change in judgment. Accordingly, our income tax benefit in the first nine months of 2017 includes an aggregate non-cash income tax benefit of $170.4 million related to the reversal of the German and Belgian valuation allowance, comprised of $12.7 million recognized in the first six months of 2017 related to the utilization of a portion of both the German and Belgian NOLs during such period, $149.9 million related to the portion of the valuation allowance reversed as of June 30, 2017, and $7.8 million recognized in the third quarter of 2017 related to the utilization of a portion of both the German and Belgian NOLs during such period. In addition, our deferred income tax asset valuation allowance increased $9.0 million in the first nine months of 2017 as a result of changes in currency exchange rates, which increase was recognized as part of other comprehensive income (loss). The remaining deferred income tax asset valuation allowance of $11.7 million as of September 30, 2017 will be reversed during the fourth quarter of 2017.

Tax authorities are examining certain of our U.S. and non-U.S. tax returns and have or may propose tax deficiencies, including penalties and interest. Because of the inherent uncertainties involved in settlement initiatives and court and tax proceedings, we cannot guarantee that these matters will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain. As a result of ongoing audits in certain jurisdictions, in 2008 we filed Advance Pricing Agreement Requests with the tax authorities in the U.S., Canada and Germany. These requests have been under review with the respective tax authorities since 2008 and prior to 2016, it was uncertain whether an agreement would be reached between the tax authorities and whether we would agree to execute and finalize such agreements.

•

During the third quarter of 2016, Contran, as the ultimate parent of our U.S. Consolidated income tax group, executed and finalized an Advance Pricing Agreement with the U.S. Internal Revenue Service and our Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (collectively, the “U.S.-Canada APA”) effective for tax years 2005 - 2015. Pursuant to the terms of the U.S.-Canada APA, the U.S. and Canadian tax authorities agreed to certain prior year changes to taxable income of our U.S. and Canadian subsidiaries. As a result of such agreed-upon changes, we recognized a $5.6 million current U.S. income tax benefit in the third quarter of 2016. In addition, our Canadian subsidiary incurred a cash income tax payment of approximately CAD $3 million (USD $2.3 million) related to the U.S.-Canada APA, but such payment was fully offset by previously provided accruals, and such income tax was paid in the third quarter of 2017.

•

During the third quarter of 2017, our Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (the “Canada-Germany APA”) effective for tax years 2005 - 2017. Pursuant to the terms of the Canada-Germany APA, the Canadian and German tax authorities agreed to certain prior year changes to taxable income of our Canadian and German subsidiaries. As a result of such agreed-upon changes, we reversed a significant portion of our reserve for uncertain tax positions and recognized a non-cash income tax benefit of $8.1 million related to such reversal in the third quarter of 2017. In addition, we recognized a $2.6 million non-cash income tax benefit related to an increase in our German NOLs and a $.6 million German cash tax refund related to the Canada-Germany APA in the third quarter of 2017.

We believe we have adequate accruals for additional taxes and related interest expense which could ultimately result from tax examinations. We believe the ultimate disposition of tax examinations should not have a material adverse effect on our consolidated financial position, results of operations or liquidity. We currently estimate that our unrecognized tax benefits will not change materially during the next twelve months.

Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Accumulated Other Comprehensive Loss

Note 12 - Accumulated other comprehensive loss:

Changes in accumulated other comprehensive loss are presented in the table below. See Note 4 for further discussion of our marketable securities, Note 9 for discussion of our defined benefit pension plans and OPEB plans, and Note 14 for discussion of our interest rate swap contract.

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(242.6	)	$	(245.8	)	$	(252.0	)	$	(269.6	)
Other comprehensive income		9.0			29.9			18.4			53.7
Balance at end of period	$	(233.6	)	$	(215.9	)	$	(233.6	)	$	(215.9	)

Marketable securities:
Balance at beginning of period	$	(.4	)	$	1.2		$	(.6	)	$	1.8
Other comprehensive income (loss) - unrealized gains (losses) arising during the period		.9			(.6	)		1.1			(1.2	)
Balance at end of period	$	.5		$	.6		$	.5		$	.6

Defined benefit pension plans:
Balance at beginning of period	$	(153.4	)	$	(180.9	)	$	(159.2	)	$	(184.8	)
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost		2.9			2.4			8.7			6.3
Balance at end of period	$	(150.5	)	$	(178.5	)	$	(150.5	)	$	(178.5	)

OPEB plans:
Balance at beginning of period	$	1.9		$	1.6		$	2.1		$	1.8
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost		(.1	)		-			(.3	)		(.2	)
Balance at end of period	$	1.8		$	1.6		$	1.8		$	1.6

Interest rate swap:
Balance at beginning of period	$	(6.0	)	$	(1.8	)	$	(2.3	)	$	(2.0	)
Other comprehensive income (loss):
Unrealized gains (losses) arising during the period		.2			(.7	)		(4.6	)		(1.5	)
Less reclassification adjustment for amounts included in earnings		.6			2.5			1.7			3.5
Balance at end of period	$	(5.2	)	$	-		$	(5.2	)	$	-

Total accumulated other comprehensive loss:
Balance at beginning of period	$	(400.5	)	$	(425.7	)	$	(412.0	)	$	(452.8	)
Other comprehensive income		13.5			33.5			25.0			60.6
Balance at end of period	$	(387.0	)	$	(392.2	)	$	(387.0	)	$	(392.2	)

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 13 - Commitments and contingencies: We are involved in various environmental, contractual, product liability, patent (or intellectual property), employment and other claims and disputes incidental to our business. At least quarterly our management discusses and evaluates the status of any pending litigation to which we are a party. The factors considered in such evaluation include, among other things, the nature of such pending cases, the status of such pending cases, the advice of legal counsel and our experience in similar cases (if any). Based on such evaluation, we make a determination as to whether we believe (i) it is probable a loss has been incurred, and if so if the amount of such loss (or a range of loss) is reasonably estimable, or (ii) it is reasonably possible but not probable a loss has been incurred, and if so if the amount of such loss (or a range of loss) is reasonably estimable, or (iii) the probability a loss has been incurred is remote. We have not accrued any material amounts for either of the two pending matters discussed below, as it is not reasonably possible we have incurred a loss that would be material to our consolidated financial condition, results of operations or liquidity. In March 2013, we were served with the complaint, Los Gatos Mercantile, Inc. d/b/a Los Gatos Ace Hardware, et al v. E.I. Du Pont de Nemours and Company, et al. (United States District Court, for the Northern District of California, Case No. 3:13-cv-01180-SI). The defendants include us, E.I. Du Pont de Nemours & Company, Huntsman International LLC and Millennium Inorganic Chemicals, Inc. As amended by plaintiffs’ third amended complaint (Harrison, Jan, et al v. E.I. Du Pont de Nemours and Company, et al), plaintiffs seek to represent a class consisting of indirect purchasers of titanium dioxide in the states of Arizona, Arkansas, California, the District of Columbia, Florida, Iowa, Kansas, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, New Mexico, New York, North Carolina, Oregon and Tennessee that indirectly purchased titanium dioxide from one or more of the defendants on or after March 1, 2002. The complaint alleges that the defendants conspired and combined to fix, raise, maintain, and stabilize the price at which titanium dioxide was sold in the United States and engaged in other anticompetitive conduct. The case is now proceeding in the trial court. We believe the action is without merit, will deny all allegations of wrongdoing and liability and intend to defend against the action vigorously. Based on our quarterly status evaluation of this case, we have determined that it is not reasonably possible that a loss that is material has been incurred in this case. In September 2016, we were served with the complaint, Home Depot U.S.A., Inc. v. E.I. Dupont Nemours and Company, et al. (United States District Court, for the Northern District of California, Case No. 3:16-cv-04865). The defendants include us, E.I. Du Pont de Nemours & Company, Huntsman International LLC and Millennium Inorganic Chemicals, Inc. The plaintiff alleges that it indirectly purchased titanium dioxide from one or more of the defendants on or after March 1, 2002. The complaint alleges that the defendants conspired and combined to fix, raise, maintain, and stabilize the price at which titanium dioxide was sold in the United States and engaged in other anticompetitive conduct. The case is now proceeding in the trial court. We believe the action is without merit, will deny all allegations of wrongdoing and liability and intend to defend against the action vigorously. Based on our quarterly status evaluation of this case, we have determined that it is not reasonably possible that a loss has been incurred in this case.

Financial Instruments

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Financial Instruments

Note 14 - Financial instruments:

The following table summarizes the valuation of our financial instruments recorded on a fair value basis as of December 31, 2016 and September 30, 2017:

	Fair Value Measurements
				Quoted		Significant
				prices in		other			Significant
				active		observable			unobservable
				markets		inputs			inputs
	Total			(Level 1)		(Level 2)			(Level 3)
	(In millions)
Asset (liability)
December 31, 2016:
Interest rate swap contract	$	(3.1	)	$	-	$	(3.1	)	$	-
Noncurrent marketable securities (See Note 4)		6.0			6.0		-			-

September 30, 2017:
Noncurrent marketable securities (See Note 4)	$	4.3		$	4.3	$	-		$	-

Our earnings and cash flows are subject to fluctuations due to changes in currency exchange rates and interest rates. Our risk management policy allows for the use of derivative financial instruments to prudently manage exposure to currency exchange rates and interest rates. Derivatives that we use are primarily currency forward contracts and interest rate swaps. We have not entered into these contracts for trading or speculative purposes in the past, nor do we currently anticipate entering into such contracts for trading or speculative purposes in the future.

Currency forward contracts - Certain of our sales generated by our non-U.S. operations are denominated in U.S. dollars. We periodically use currency forward contracts to manage a very nominal portion of currency exchange rate risk associated with trade receivables denominated in a currency other than the holder’s functional currency or similar exchange rate risk associated with future sales. Derivatives used to hedge forecasted transactions and specific cash flows associated with financial assets and liabilities denominated in currencies other than the U.S. dollar and which meet the criteria for hedge accounting are designated as cash flow hedges. Consequently, the effective portion of gains and losses is deferred as a component of accumulated other comprehensive income and is recognized in earnings at the time the hedged item affects earnings. Contracts that do not meet the criteria for hedge accounting are marked-to-market at each balance sheet date with any resulting gain or loss recognized in income currently as part of net currency transaction gains and losses. The fair value of the currency forward contracts is determined using Level 1 inputs based on the currency spot forward rates quoted by banks or currency dealers.

At December 31, 2016 and September 30, 2017, we had no currency forward contracts outstanding. We did not use hedge accounting for any of our contracts to the extent we held such contracts in 2016.

Interest rate swap contract - As part of our interest rate risk management strategy, in August 2015 we entered into a pay- fixed/receive-variable interest rate swap contract with Wells Fargo Bank, N.A. to minimize our exposure to volatility in LIBOR as it relates to our forecasted outstanding variable-rate indebtedness. Under this interest rate swap, we paid a fixed rate of 2.016% per annum, payable quarterly, and received a variable rate of three-month LIBOR (subject to a 1.00% floor), also payable quarterly, in each case based on the notional amount of the swap then outstanding. The effective date of the swap contract was September 30, 2015. The notional amount of the swap started at $344.8 million and declined by $875,000 each quarter beginning December 31, 2015, with an original final maturity of the swap contract in February 2020. This swap contract was designated as a cash flow hedge and qualified as an effective hedge at inception under ASC Topic 815 in respect to our term loan indebtedness. The effective portion of changes in fair value on this interest rate swap was recorded as a component of other comprehensive income, net of deferred income taxes. Commencing in the fourth quarter of 2015, as interest expense accrued on LIBOR-based variable rate debt, we classified the amount we paid under the pay-fixed leg of the swap and the amount we received under the receive-variable leg of the swap as part of interest expense (as well as part of the amount we report as cash paid for interest in our Condensed Consolidated Statements of Cash Flows), with the net effect that the amount of interest expense we recognized on our LIBOR-based variable rate debt each quarter, as it relates to the notional amount of the swap outstanding each quarter, was based on a fixed rate of 2.016% per annum in lieu of the level of LIBOR prevailing during the quarter.

In September 2017, in connection with the voluntary prepayment and termination of our term loan discussed in Note 6, we voluntarily terminated this swap contract, as we no longer had any exposure to volatility in respect of LIBOR. The cost to us to early terminate the swap contract was $3.3 million, which we paid to Wells Fargo concurrent with the termination. Such $3.3 million charge is classified as part of our loss on prepayment of debt discussed in Note 6. Such $3.3 million amount is also classified as part of the cash paid for interest disclosed in our Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2017.

Prior to the termination of the interest rate swap contract, a pretax unrealized loss arising in 2017 of $2.3 million was recognized in other comprehensive income (loss) related to the interest rate swap and $2.1 million was reclassified from accumulated other comprehensive loss into earnings and is included in interest expense in our Consolidated Statements of Income. Since the inception of the swap until the swap contract termination, there had been no gains or losses recognized in earnings representing hedge ineffectiveness with respect to the interest rate swap.

The fair value of the interest rate swap was estimated by a third party using inputs that are observable or that can be corroborated by observable market data such as interest rate yield curves, and therefore, was classified within Level 2 of the valuation hierarchy.

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2016 and September 30, 2017.

	December 31, 2016				September 30, 2017
	Carrying amount		Fair value		Carrying amount		Fair value
	(In millions)
Cash, cash equivalents and restricted cash	$	52.3	$	52.3	$	318.0	$	318.0
Long-term debt:
Fixed rate Senior Notes		-		-		464.2		480.4
Variable rate term loan		335.9		334.6		-		-
Common stockholders' equity		395.0		1,383.8		710.7		2,646.0

At September 30, 2017, the estimated market price of our Senior Notes was €1,019 per €1,000 principal amount. The fair value of our Senior Notes is based on quoted market prices; however, these quoted market prices represented Level 2 inputs because the markets in which the Senior Notes trade were not active. The fair value of our common stockholders’ equity is based upon quoted market prices at each balance sheet date, which represent Level 1 inputs. Due to their near-term maturities, the carrying amounts of accounts receivable and accounts payable are considered equivalent to fair value. See Notes 2 and 7.

Recent Accounting Pronouncements Not Yet Adopted	9 Months Ended
Recent Accounting Pronouncements Not Yet Adopted	Sep. 30, 2017
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Recent Accounting Pronouncements not yet Adopted	Note 15 - Recent accounting pronouncements not yet adopted: In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606). This standard replaces existing revenue recognition guidance, which in many cases was tailored for specific industries, with a uniform accounting standard applicable to all industries and transactions. The new standard, as amended, is currently effective for us beginning with the first quarter of 2018. Entities may elect to adopt ASU No. 2014-09 retrospectively for all periods for all contracts and transactions which occurred during the period (with a few exceptions for practical expediency) or retrospectively with a cumulative effect recognized as of the date of adoption. ASU No. 2014-09 is a fundamental rewriting of existing GAAP with respect to revenue recognition, and we are still evaluating the effect the standard will have on our Consolidated Financial Statements. We currently expect to adopt the standard in the first quarter of 2018 using the modified retrospective approach to adoption. Our sales generally involve single performance obligations to ship goods pursuant to customer purchase orders without further underlying contracts, and as such we expect adoption of this standard will have a minimal effect on our revenues. We are in the process of evaluating the additional disclosure requirements. In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects related to the recognition, measurement, presentation and disclosure of financial instruments. The ASU requires equity investments (except for those accounted for under the equity method of accounting or those that result in the consolidation of the investee) to generally be measured at fair value with changes in fair value recognized in net income. The amendment also requires a number of other changes, including among others: simplifying the impairment assessment for equity instruments without readily determinable fair values; eliminating the requirement for public business entities to disclose methods and assumptions used to determine fair value for financial instruments measured at amortized cost; requiring an exit price notion when measuring the fair value of financial instruments for disclosure purposes; and requiring separate presentation of financial assets and liabilities by measurement category and form of asset. The changes indicated above will be effective for us beginning in the first quarter of 2018, with prospective application required, and early adoption is not permitted. The most significant aspect of adopting this ASU will be the requirement to recognize changes in fair value of our available-for-sale marketable equity securities in net income (currently changes in fair value of such securities are recognized in other comprehensive income). In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which is a comprehensive rewriting of the lease accounting guidance which aims to increase comparability and transparency with regard to lease transactions. The primary change will be the recognition of lease assets for the right-of-use of the underlying asset and lease liabilities for the obligation to make payments by lessees on the balance sheet for leases currently classified as operating leases. The ASU also requires increased qualitative disclosure about leases in addition to quantitative disclosures currently required. Companies are required to use a modified retrospective approach to adoption with a practical expedient which will allow companies to continue to account for existing leases under the prior guidance unless a lease is modified, other than the requirement to recognize the right-of-use asset and lease liability for all operating leases. The changes indicated above will be effective for us beginning in the first quarter of 2019, with early adoption permitted. We are in the process of assessing all of our current leases. We have not yet evaluated the effect this ASU will have on our Consolidated Financial Statements, but given the material amount of our future minimum payments under non-cancellable operating leases at December 31, 2016 discussed in Note 17 to our 2016 Annual Report, we expect to recognize a material right-of-use lease asset and lease liability upon adoption of the ASU. In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715) Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires that the service cost component of net periodic defined benefit pension and OPEB cost be reported in the same line item as other compensation costs for applicable employees incurred during the period. Other components of such net benefit cost are required to be presented in the income statement separately from the service cost component, and below income from operations (if such a subtotal is presented). These other net benefit cost components must be disclosed either on the face of the financial statements or in the notes to the financial statements. In addition only the service cost component is eligible for capitalization in assets where applicable (inventory or internally constructed fixed assets for example). The amendments in ASU 2017-06 are effective for us beginning in the first quarter of 2018, early adoption as of the beginning of an annual period is permitted, retrospective presentation is required for the income statement presentation of the service cost component and other components of net benefit cost, and prospective application is required for the capitalization in assets of the service cost component of net benefit cost. We expect to adopt this ASU in the first quarter of 2018. We currently include all of our net benefit cost for defined benefit pension plans as part of compensation expense which is capitalized into inventory, we present a subtotal for income from operations and our net periodic defined benefit pension cost is currently included in the determination of income from operations. Accordingly, adoption of this standard will change the amount of our aggregate compensation cost capitalized in inventory, and change the determination of the amount we report as income from operations. As disclosed in Note 10 to our 2016 Annual Report, the service cost component represented approximately $9.9 million of our total net periodic defined benefit pension costs of $22.0 million in 2016. None of the components of our net OPEB cost, or our total OPEB cost, were material in 2016.

Organization and Basis of Presentation (Policies)	9 Months Ended
Organization and Basis of Presentation (Policies)	Sep. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	Organization - At September 30, 2017, Valhi, Inc. (NYSE: VHI) held approximately 50% of our outstanding common stock and a wholly-owned subsidiary of NL Industries, Inc. (NYSE: NL) held approximately 30% of our common stock, Valhi owned approximately 83% of NL’s outstanding common stock and a wholly-owned subsidiary of Contran Corporation held approximately 93% of Valhi’s outstanding common stock. All of Contran’s outstanding voting stock is held by a family trust established for the benefit of Lisa K. Simmons and Serena Simmons Connelly and their children, for which Ms. Simmons and Ms. Connelly are co-trustees, or is held directly by Ms. Simmons and Ms. Connelly or entities related to them. Consequently, Ms. Simmons and Ms. Connelly may be deemed to control Contran, Valhi, NL and us.
Basis of Presentation	Basis of presentation - The unaudited Condensed Consolidated Financial Statements contained in this Quarterly Report have been prepared on the same basis as the audited Consolidated Financial Statements in our Annual Report on Form 10-K for the year ended December 31, 2016 that we filed with the Securities and Exchange Commission (SEC) on March 10, 2017 (2016 Annual Report). In our opinion, we have made all necessary adjustments (which include only normal recurring adjustments, other than the reversal of the deferred income tax asset valuation allowance recognized in the second quarter of 2017, as discussed in Note 11) in order to state fairly, in all material respects, our consolidated financial position, results of operations and cash flows as of the dates and for the periods presented. We have condensed the Consolidated Balance Sheet at December 31, 2016 contained in this Quarterly Report as compared to our audited Consolidated Financial Statements at that date, and we have omitted certain information and footnote disclosures (including those related to the Consolidated Balance Sheet at December 31, 2016) normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). Our results of operations for the interim periods ended September 30, 2017 may not be indicative of our operating results for the full year. The Condensed Consolidated Financial Statements contained in this Quarterly Report should be read in conjunction with our 2016 Consolidated Financial Statements contained in our 2016 Annual Report. Unless otherwise indicated, references in this report to “we,” “us” or “our” refer to Kronos Worldwide, Inc. and its subsidiaries (NYSE: KRO) taken as a whole.
Derivatives	We periodically use currency forward contracts to manage a very nominal portion of currency exchange rate risk associated with trade receivables denominated in a currency other than the holder’s functional currency or similar exchange rate risk associated with future sales. Derivatives used to hedge forecasted transactions and specific cash flows associated with financial assets and liabilities denominated in currencies other than the U.S. dollar and which meet the criteria for hedge accounting are designated as cash flow hedges. Consequently, the effective portion of gains and losses is deferred as a component of accumulated other comprehensive income and is recognized in earnings at the time the hedged item affects earnings. Contracts that do not meet the criteria for hedge accounting are marked-to-market at each balance sheet date with any resulting gain or loss recognized in income currently as part of net currency transaction gains and losses.
New Accounting Pronouncements, Policy	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606). This standard replaces existing revenue recognition guidance, which in many cases was tailored for specific industries, with a uniform accounting standard applicable to all industries and transactions. The new standard, as amended, is currently effective for us beginning with the first quarter of 2018. Entities may elect to adopt ASU No. 2014-09 retrospectively for all periods for all contracts and transactions which occurred during the period (with a few exceptions for practical expediency) or retrospectively with a cumulative effect recognized as of the date of adoption. ASU No. 2014-09 is a fundamental rewriting of existing GAAP with respect to revenue recognition, and we are still evaluating the effect the standard will have on our Consolidated Financial Statements. We currently expect to adopt the standard in the first quarter of 2018 using the modified retrospective approach to adoption. Our sales generally involve single performance obligations to ship goods pursuant to customer purchase orders without further underlying contracts, and as such we expect adoption of this standard will have a minimal effect on our revenues. We are in the process of evaluating the additional disclosure requirements. In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects related to the recognition, measurement, presentation and disclosure of financial instruments. The ASU requires equity investments (except for those accounted for under the equity method of accounting or those that result in the consolidation of the investee) to generally be measured at fair value with changes in fair value recognized in net income. The amendment also requires a number of other changes, including among others: simplifying the impairment assessment for equity instruments without readily determinable fair values; eliminating the requirement for public business entities to disclose methods and assumptions used to determine fair value for financial instruments measured at amortized cost; requiring an exit price notion when measuring the fair value of financial instruments for disclosure purposes; and requiring separate presentation of financial assets and liabilities by measurement category and form of asset. The changes indicated above will be effective for us beginning in the first quarter of 2018, with prospective application required, and early adoption is not permitted. The most significant aspect of adopting this ASU will be the requirement to recognize changes in fair value of our available-for-sale marketable equity securities in net income (currently changes in fair value of such securities are recognized in other comprehensive income). In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which is a comprehensive rewriting of the lease accounting guidance which aims to increase comparability and transparency with regard to lease transactions. The primary change will be the recognition of lease assets for the right-of-use of the underlying asset and lease liabilities for the obligation to make payments by lessees on the balance sheet for leases currently classified as operating leases. The ASU also requires increased qualitative disclosure about leases in addition to quantitative disclosures currently required. Companies are required to use a modified retrospective approach to adoption with a practical expedient which will allow companies to continue to account for existing leases under the prior guidance unless a lease is modified, other than the requirement to recognize the right-of-use asset and lease liability for all operating leases. The changes indicated above will be effective for us beginning in the first quarter of 2019, with early adoption permitted. We are in the process of assessing all of our current leases. We have not yet evaluated the effect this ASU will have on our Consolidated Financial Statements, but given the material amount of our future minimum payments under non-cancellable operating leases at December 31, 2016 discussed in Note 17 to our 2016 Annual Report, we expect to recognize a material right-of-use lease asset and lease liability upon adoption of the ASU. In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715) Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires that the service cost component of net periodic defined benefit pension and OPEB cost be reported in the same line item as other compensation costs for applicable employees incurred during the period. Other components of such net benefit cost are required to be presented in the income statement separately from the service cost component, and below income from operations (if such a subtotal is presented). These other net benefit cost components must be disclosed either on the face of the financial statements or in the notes to the financial statements. In addition only the service cost component is eligible for capitalization in assets where applicable (inventory or internally constructed fixed assets for example). The amendments in ASU 2017-06 are effective for us beginning in the first quarter of 2018, early adoption as of the beginning of an annual period is permitted, retrospective presentation is required for the income statement presentation of the service cost component and other components of net benefit cost, and prospective application is required for the capitalization in assets of the service cost component of net benefit cost. We expect to adopt this ASU in the first quarter of 2018. We currently include all of our net benefit cost for defined benefit pension plans as part of compensation expense which is capitalized into inventory, we present a subtotal for income from operations and our net periodic defined benefit pension cost is currently included in the determination of income from operations. Accordingly, adoption of this standard will change the amount of our aggregate compensation cost capitalized in inventory, and change the determination of the amount we report as income from operations. As disclosed in Note 10 to our 2016 Annual Report, the service cost component represented approximately $9.9 million of our total net periodic defined benefit pension costs of $22.0 million in 2016. None of the components of our net OPEB cost, or our total OPEB cost, were material in 2016.

Accounts and Other Receivables (Tables)

9 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Accounts and Other Receivables

	December 31,			September 30,
	2016			2017
	(In millions)
Trade receivables	$	224.8		$	326.8
Recoverable VAT and other receivables		16.7			16.1
Receivable from affiliates:
Income taxes, net - Valhi		.7			1.3
Louisiana Pigment Company, L.P.		-			9.3
Other		2.8			3.5
Refundable income taxes		.3			-
Allowance for doubtful accounts		(.7	)		(1.6	)
Total	$	244.6		$	355.4

Inventories, Net (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories, Net

	December 31,		September 30,
	2016		2017
	(In millions)
Raw materials	$	68.7	$	89.4
Work in process		22.3		17.8
Finished products		195.7		162.9
Supplies		56.8		65.2
Total	$	343.5	$	335.3

Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2017

Investments Debt And Equity Securities [Abstract]

Classification of Marketable Securities

	Fair value
	measurement	Market		Cost
Marketable security	level	value		basis		Unrealized gain
		(In millions)
December 31, 2016:
Valhi common stock	1	$	5.9	$	3.2	$	2.7
NL and CompX common stocks	1		.1		.1		-
Total		$	6.0	$	3.3	$	2.7

September 30, 2017:
Valhi common stock	1	$	4.2	$	3.2	$	1.0
NL and CompX common stocks	1		.1		.1		-
Total		$	4.3	$	3.3	$	1.0

Other Noncurrent Assets (Tables)

9 Months Ended

Sep. 30, 2017

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Schedule of Other Noncurrent Assets

	December 31,		September 30,
	2016		2017
	(In millions)
Pension asset	$	.6	$	.9
Deferred financing costs, net		.4		.8
Other		1.2		1.9
Total	$	2.2	$	3.6

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Components of Long Term Debt

	December 31,		September 30,
	2016		2017
	(In millions)
Kronos International, Inc. 3.75% Senior Secured Notes	$	-	$	464.2
Term loan		335.9		-
Other		3.1		3.4
Total debt		339.0		467.6
Less current maturities		3.6		.1
Total long-term debt	$	335.4	$	467.5

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Accounts Payable and Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

Payables And Accruals [Abstract]

Components of Accounts Payable and Accrued Liabilities

	December 31,		September 30,
	2016		2017
	(In millions)
Accounts payable	$	84.9	$	116.8
Accrued sales discounts and rebates		20.9		25.7
Employee benefits		17.7		24.9
Reserve for uncertain tax positions		3.3		-
Interest rate swap contract		2.9		-
Accrued workforce reduction costs		1.2		.2
Payable to affiliate -
Louisiana Pigment Company, L.P.		14.7		12.2
Other		27.9		37.2
Total	$	173.5	$	217.0

Other Noncurrent Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

Other Liabilities Disclosure [Abstract]

Components of Other Noncurrent Liabilities

	December 31,		September 30,
	2016		2017
	(In millions)
Reserve for uncertain tax positions	$	7.3	$	1.3
Employee benefits		7.8		8.4
Interest rate swap contract		.2		-
Other		7.1		12.0
Total	$	22.4	$	21.7

Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Defined Benefit Pension Plans

Components of Net Periodic Benefit Cost

Defined benefit plans - The components of net periodic defined benefit pension cost are presented in the table below.

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Service cost	$	2.5		$	3.0		$	7.5		$	8.5
Interest cost		3.9			3.6			11.6			10.3
Expected return on plan assets		(3.9	)		(2.6	)		(11.6	)		(7.6	)
Amortization of prior service cost		.1			-			.2			.2
Recognized actuarial losses		2.9			3.5			8.9			10.0
Total	$	5.5		$	7.5		$	16.6		$	21.4

OPEB

Components of Net Periodic Benefit Cost

Postretirement benefits - The components of net periodic postretirement benefits other than pension (OPEB) cost are presented in the table below.

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Service cost	$	-		$	-		$	.1		$	.1
Interest cost		.1			.1			.2			.2
Amortization of prior service credit		(.2	)		(.1	)		(.6	)		(.4	)
Recognized actuarial losses		.1			-			.2			.1
Total	$	-		$	-		$	(.1	)	$	-

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Components of Effective Income Tax Rate Reconciliation and Comprehensive Provision for Income Taxes Allocation

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Expected tax expense, at U.S. federal statutory income tax rate of 35%	$	8.1		$	28.0		$	8.2		$	67.6
Non-U.S. tax rates		(1.0	)		(3.4	)		(1.4	)		(8.2	)
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies		(.8	)		.2			(1.6	)		6.8
Valuation allowance		(.8	)		(7.8	)		2.1			(170.4	)
U.S. - Canada APA		(5.6	)		-			(5.6	)		-
Adjustment to reserve for uncertain tax positions, net		.4			(8.1	)		.6			(7.6	)
Nondeductible expenses		.3			.5			.7			1.1
Canada - Germany APA		-			(3.2	)		-			(3.2	)
U.S. state income tax and other, net		.1			(.1	)		.2			(.1	)
Income tax expense (benefit)	$	.7		$	6.1		$	3.2		$	(114.0	)

Comprehensive provision for income taxes allocable to:
Net income	$	.7		$	6.1		$	3.2		$	(114.0	)
Other comprehensive income (loss):
Currency translation		-			6.4			-			19.7
Marketable securities		.5			(.3	)		.6			(.6	)
Pension plans		.1			1.1			.4			3.2
OPEB plans		-			-			(.1	)		(.1	)
Interest rate swap		.4			1.0			(1.6	)		1.1
Total	$	1.7		$	14.3		$	2.5		$	(90.7	)

Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Loss

	Three months ended						Nine months ended
	September 30,						September 30,
	2016			2017			2016			2017
	(In millions)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(242.6	)	$	(245.8	)	$	(252.0	)	$	(269.6	)
Other comprehensive income		9.0			29.9			18.4			53.7
Balance at end of period	$	(233.6	)	$	(215.9	)	$	(233.6	)	$	(215.9	)

Marketable securities:
Balance at beginning of period	$	(.4	)	$	1.2		$	(.6	)	$	1.8
Other comprehensive income (loss) - unrealized gains (losses) arising during the period		.9			(.6	)		1.1			(1.2	)
Balance at end of period	$	.5		$	.6		$	.5		$	.6

Defined benefit pension plans:
Balance at beginning of period	$	(153.4	)	$	(180.9	)	$	(159.2	)	$	(184.8	)
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost		2.9			2.4			8.7			6.3
Balance at end of period	$	(150.5	)	$	(178.5	)	$	(150.5	)	$	(178.5	)

OPEB plans:
Balance at beginning of period	$	1.9		$	1.6		$	2.1		$	1.8
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost		(.1	)		-			(.3	)		(.2	)
Balance at end of period	$	1.8		$	1.6		$	1.8		$	1.6

Interest rate swap:
Balance at beginning of period	$	(6.0	)	$	(1.8	)	$	(2.3	)	$	(2.0	)
Other comprehensive income (loss):
Unrealized gains (losses) arising during the period		.2			(.7	)		(4.6	)		(1.5	)
Less reclassification adjustment for amounts included in earnings		.6			2.5			1.7			3.5
Balance at end of period	$	(5.2	)	$	-		$	(5.2	)	$	-

Total accumulated other comprehensive loss:
Balance at beginning of period	$	(400.5	)	$	(425.7	)	$	(412.0	)	$	(452.8	)
Other comprehensive income		13.5			33.5			25.0			60.6
Balance at end of period	$	(387.0	)	$	(392.2	)	$	(387.0	)	$	(392.2	)

Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Valuation of Financial Instruments Recorded on Fair Value Basis

The following table summarizes the valuation of our financial instruments recorded on a fair value basis as of December 31, 2016 and September 30, 2017:

	Fair Value Measurements
				Quoted		Significant
				prices in		other			Significant
				active		observable			unobservable
				markets		inputs			inputs
	Total			(Level 1)		(Level 2)			(Level 3)
	(In millions)
Asset (liability)
December 31, 2016:
Interest rate swap contract	$	(3.1	)	$	-	$	(3.1	)	$	-
Noncurrent marketable securities (See Note 4)		6.0			6.0		-			-

September 30, 2017:
Noncurrent marketable securities (See Note 4)	$	4.3		$	4.3	$	-		$	-

Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2016 and September 30, 2017.

	December 31, 2016				September 30, 2017
	Carrying amount		Fair value		Carrying amount		Fair value
	(In millions)
Cash, cash equivalents and restricted cash	$	52.3	$	52.3	$	318.0	$	318.0
Long-term debt:
Fixed rate Senior Notes		-		-		464.2		480.4
Variable rate term loan		335.9		334.6		-		-
Common stockholders' equity		395.0		1,383.8		710.7		2,646.0

Organization and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017
Valhi Inc \| Kronos Worldwide, Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage in subsidiary	50.00%
Valhi Inc \| NL Industries Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage in company	83.00%
NL Industries Inc. \| Kronos Worldwide, Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage	30.00%
Contran
Organization And Basis Of Presentation [Line Items]
Controlling interest description	Consequently, Ms. Simmons and Ms. Connelly may be deemed to control Contran, Valhi, NL and us.
Contran \| Valhi Inc
Organization And Basis Of Presentation [Line Items]
Ownership percentage of parent company held by related party	93.00%

Accounts and Other Receivables - Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (1.6)	$ (0.7)
Total	355.4	244.6
Trade receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	326.8	224.8
Recoverable VAT and other receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	16.1	16.7
Other
Accounts Notes And Loans Receivable [Line Items]
Receivable from affiliates	3.5	2.8
Refundable income taxes
Accounts Notes And Loans Receivable [Line Items]
Refundable income taxes		0.3
Valhi \| Income taxes, net
Accounts Notes And Loans Receivable [Line Items]
Receivable from affiliates	1.3	$ 0.7
Louisiana Pigment Company, L.P.
Accounts Notes And Loans Receivable [Line Items]
Receivable from affiliates	$ 9.3

Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 89.4	$ 68.7
Work in process	17.8	22.3
Finished products	162.9	195.7
Supplies	65.2	56.8
Total	$ 335.3	$ 343.5

Marketable Securities - Classification of Marketable Securities (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Market value	$ 4.3	$ 6.0
Cost basis	3.3	3.3
Unrealized gain	1.0	2.7
Level 1 \| Common stock \| Valhi
Schedule Of Available For Sale Securities [Line Items]
Market value	4.2	5.9
Cost basis	3.2	3.2
Unrealized gain	1.0	2.7
Level 1 \| Common stock \| NL And CompX
Schedule Of Available For Sale Securities [Line Items]
Market value	0.1	0.1
Cost basis	$ 0.1	$ 0.1

- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References + Details

Marketable Securities - Additional Information (Detail) - Valhi Inc - Common stock - $ / shares shares in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Investments in publicly-traded shares	1.7	1.7
Quoted market price of per share	$ 2.43	$ 3.46

Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Disclosure Other Non Current Assets Schedule Of Other Non Current Assets [Abstract]
Pension asset	$ 0.9	$ 0.6
Deferred financing costs, net	0.8	0.4
Other	1.9	1.2
Total	$ 3.6	$ 2.2

Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Secured Notes	$ 464.2
Term loan		$ 335.9
Other	3.4	3.1
Total debt	467.6	339.0
Less current maturities	0.1	3.6
Total long-term debt	467.5	$ 335.4
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Secured Notes	$ 464.2

Long-Term Debt - Senior Secured Notes - Additional Information (Detail)		1 Months Ended	9 Months Ended
	Sep. 13, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 13, 2017 EUR (€)
Term Loan
Debt Instrument [Line Items]
Repayments of debt		$ 338,600,000
Senior Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs		7,400,000	$ 7,400,000
North American Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of line of credit using Senior Notes proceeds	$ 21,000,000	$ 21,000,000
Senior Secured Notes
Debt Instrument [Line Items]
Minimum amount of debt default for using customary default provisions	50,000,000
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Debt instrument principal amount	$ 477,600,000			€ 400,000,000
Debt instrument interest rate	3.75%			3.75%
Debt instrument maturity date	Sep. 15, 2025
Debt instrument, interest payment terms			bear interest at 3.75% per annum, payable semi-annually on March 15 and September 15 of each year, beginning on March 15, 2018
Debt instrument, frequency of periodic payment of interest			semi-annually
Debt instrument, date of first semi-annual interest payment	--03-15
Debt instrument, date of second semi-annual interest payment	--09-15
Debt Instrument, date of first required semi-annual payment	Mar. 15, 2018
Debt instrument redemption price percent if experience certain specified change of control events	101.00%
Debt instrument, redemption, description			have a maturity date of September 15, 2025. Prior to September 15, 2020, we may redeem some or all of the Senior Notes at a price equal to 100% of the principal amount thereof, plus a “make-whole” premium (as defined in the indenture governing the Senior Notes). On or after September 15, 2020, we may redeem the Senior Notes at redemption prices ranging from 102.813% of the principal amount, declining to 100% on or after September 15, 2023. In addition, on or before September 15, 2020, we may redeem up to 40% of the Senior Notes with the net proceeds of certain public or private equity offerings at 103.75% of the principal amount. If we experience certain specified change of control events, we would be required to make an offer to purchase the Senior Notes at 101% of the principal amount. We would also be required to make an offer to purchase a specified portion of the Senior Notes at par value in the event that we generate a certain amount of net proceeds from the sale of assets outside the ordinary course of business, and such net proceeds are not otherwise used for specified purposes within a specified time period;
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| Collateral Pledged \| Direct Domestic Subsidiary of KII and Guarantors
Debt Instrument [Line Items]
Parent company ownership interest	100.00%			100.00%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| Collateral Pledged \| Foreign Subsidiary Directly Owned by KII or any Guarantor
Debt Instrument [Line Items]
Parent company ownership interest	65.00%			65.00%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| Collateral Pledged \| Foreign Subsidiary Directly Owned by KII or any Guarantor \| Non-voting Common Stock
Debt Instrument [Line Items]
Parent company ownership interest	100.00%			100.00%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| Prior to September 15, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	100.00%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| On or After September 15, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	102.813%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| On or After September 15, 2023
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	100.00%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| On or Before September 15, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	103.75%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| On or Before September 15, 2020 \| Maximum
Debt Instrument [Line Items]
Debt instrument, percentage of debt that may be redeemed	40.00%
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025 \| Term Loan
Debt Instrument [Line Items]
Repayments of debt	$ 338,600,000

Long-Term Debt - Term Loan - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 13, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Loss on prepayment of debt, net		$ (7.1)			$ (7.1)
Term Loan
Debt Instrument [Line Items]
Quarterly principal payments			$ 1.8
Debt instrument, voluntary repayment period					2017-09
Repayments of debt	$ 338.6
Loss on prepayment of debt, net		(7.1)
Termination of interest rate swap contract		3.3
Write-off of unamortized debt issuance costs		2.7
Write-off of unamortized original issue discount		$ 0.7
Average interest rate during period				4.10%

Long-Term Debt - Revolving Credit Facilities - Additional Information (Detail) $ in Millions			1 Months Ended		8 Months Ended	9 Months Ended
	Sep. 13, 2017 USD ($)	Aug. 31, 2017 EUR (€)	Sep. 30, 2017 USD ($)	Jan. 31, 2017	Sep. 13, 2017	Sep. 30, 2017 USD ($)	Sep. 30, 2017 EUR (€)
European Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility amended month and year						2017-09
Line of Credit Maturity			2022-09
Line of credit facility, maturity period			5 years
Line of credit maximum borrowing capacity \| €		€ 120,000,000					€ 90,000,000
Amount available for Borrowing			$ 106.1			$ 106.1	€ 90,000,000
European Revolving Credit Facility \| EURIBOR
Debt Instrument [Line Items]
Interest rate on outstanding borrowings		1.90%	1.60%
North American Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit maturity, description						In January 2017, we extended the maturity date of our North American revolving credit facility to the earlier of (i) January 30, 2022 or (ii) 90 days prior to the maturity date of our then-existing term loan indebtedness (or 90 days prior to the maturity date of any indebtedness incurred in a permitted refinancing of such existing term loan indebtedness). The issuance of the Senior Notes is a permitted refinancing of our term loan, and accordingly, the maturity date of the North American revolving credit facility is January 30, 2022.
Borrowings under credit facility during the period						$ 253.9
Repayments of Lines of Credit						253.9
Average interest rate during period					4.80%
Repayments of line of credit using Senior Notes proceeds	$ 21.0		$ 21.0
Amount available for additional borrowing			$ 100.0			$ 100.0
North American Revolving Credit Facility \| Maturity Date Option 1
Debt Instrument [Line Items]
Line of credit, maturity date				Jan. 30, 2022
North American Revolving Credit Facility \| Maturity Date Option 2
Debt Instrument [Line Items]
Maturity date of Senior Notes				90 days

Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accounts Payable And Accrued Liabilities [Line Items]
Accounts payable	$ 116.8	$ 84.9
Accrued sales discounts and rebates	25.7	20.9
Employee benefits	24.9	17.7
Reserve for uncertain tax positions		3.3
Interest rate swap contract		2.9
Accrued workforce reduction costs	0.2	1.2
Other	37.2	27.9
Total	217.0	173.5
Louisiana Pigment Company, L.P.
Accounts Payable And Accrued Liabilities [Line Items]
Payable to affiliate	$ 12.2	$ 14.7

Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other Liabilities Noncurrent [Abstract]
Reserve for uncertain tax positions	$ 1.3	$ 7.3
Employee benefits	8.4	7.8
Interest rate swap contract		0.2
Other	12.0	7.1
Total	$ 21.7	$ 22.4

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost					$ 9.9
Total					$ 22.0
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.0	$ 2.5	$ 8.5	$ 7.5
Interest cost	3.6	3.9	10.3	11.6
Expected return on plan assets	(2.6)	(3.9)	(7.6)	(11.6)
Amortization of prior service cost (credit)		0.1	0.2	0.2
Recognized actuarial losses	3.5	2.9	10.0	8.9
Total	7.5	5.5	21.4	16.6
OPEB
Defined Benefit Plan Disclosure [Line Items]
Service cost			0.1	0.1
Interest cost	0.1	0.1	0.2	0.2
Amortization of prior service cost (credit)	$ (0.1)	(0.2)	(0.4)	(0.6)
Recognized actuarial losses		$ 0.1	$ 0.1	0.2
Total				$ (0.1)

Employee Benefit Plans - Additional Information (Detail) $ in Millions	Sep. 30, 2017 USD ($)
Compensation And Retirement Disclosure [Abstract]
Expected contributions for pension plans in 2017	$ 15

Other Operating Income (Expense), Net - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017
Other Operating Income And Expense [Line Items]
Insurance settlements receivable		$ 0
Other Operating Income (Expense), Net
Other Operating Income And Expense [Line Items]
Income received from settlement of business interruption insurance claim	$ 3,400,000

Income Taxes - Components of Effective Income Tax Rate Reconciliation and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule Of Income Tax [Line Items]
Expected tax expense, at U.S. federal statutory income tax rate of 35%	$ 28.0	$ 8.1	$ 67.6	$ 8.2
Non-U.S. tax rates	(3.4)	(1.0)	(8.2)	(1.4)
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies	0.2	(0.8)	6.8	(1.6)
Valuation allowance	(7.8)	(0.8)	(170.4)	2.1
Adjustment to reserve for uncertain tax positions, net	(8.1)	0.4	(7.6)	0.6
Nondeductible expenses	0.5	0.3	1.1	0.7
U.S. state income tax and other, net	(0.1)	0.1	(0.1)	0.2
Income tax expense (benefit)	6.1	0.7	(114.0)	3.2
Comprehensive provision for income taxes allocable to:
Net income	6.1	0.7	(114.0)	3.2
Other comprehensive income (loss):
Currency translation	6.4		19.7
Marketable securities	(0.3)	0.5	(0.6)	0.6
Interest rate swap	1.0	0.4	1.1	(1.6)
Total	14.3	1.7	(90.7)	2.5
Defined Benefit Pension Plans
Other comprehensive income (loss):
Benefit plans	1.1	0.1	3.2	0.4
OPEB
Other comprehensive income (loss):
Benefit plans			(0.1)	(0.1)
U.S. - Canada APA
Schedule Of Income Tax [Line Items]
APA		$ (5.6)		$ (5.6)
Canada - Germany APA
Schedule Of Income Tax [Line Items]
APA	$ (3.2)		$ (3.2)

Income Taxes - Components of Effective Income Tax Rate Reconciliation and Comprehensive Provision for Income Taxes Allocation (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
U.S. Federal statutory income tax rate	35.00%

Income Taxes - Additional Information (Detail) $ in Millions, $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 CAD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Income Tax [Line Items]
U.S. Federal statutory income tax rate						35.00%
Estimated reversal of deferred income tax asset valuation allowance	$ 11.7					$ 11.7
Non-cash income tax benefit related to reversal of reserve for uncertain tax positions	(8.1)			$ 0.4		$ (7.6)	$ 0.6
U.S. - Canada APA
Income Tax [Line Items]
U.S.-Canada Advance Pricing Agreement, description						Tax authorities are examining certain of our U.S. and non-U.S. tax returns and have or may propose tax deficiencies, including penalties and interest. Because of the inherent uncertainties involved in settlement initiatives and court and tax proceedings, we cannot guarantee that these matters will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain. As a result of ongoing audits in certain jurisdictions, in 2008 we filed Advance Pricing Agreement Requests with the tax authorities in the U.S., Canada and Germany. These requests have been under review with the respective tax authorities since 2008 and prior to 2016, it was uncertain whether an agreement would be reached between the tax authorities and whether we would agree to execute and finalize such agreements. During the third quarter of 2016, Contran, as the ultimate parent of our U.S. Consolidated income tax group, executed and finalized an Advance Pricing Agreement with the U.S. Internal Revenue Service and our Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (collectively, the “U.S.-Canada APA”) effective for tax years 2005 - 2015.
Current U.S. income tax benefit				$ (5.6)
U.S. - Canada APA \| Canadian Subsidiary
Income Tax [Line Items]
Income tax paid in cash	2.3	$ 3
Canada - Germany APA
Income Tax [Line Items]
U.S.-Canada Advance Pricing Agreement, description						During the third quarter of 2017, our Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (the “Canada-Germany APA”) effective for tax years 2005 - 2017. Pursuant to the terms of the Canada-Germany APA, the Canadian and German tax authorities agreed to certain prior year changes to taxable income of our Canadian and German subsidiaries.
Expected Future Periods Net Operating Loss Utilization
Income Tax [Line Items]
Increase (decrease) in non-cash deferred income tax asset valuation allowance			$ (149.9)
Effect of Currency Exchange Rates
Income Tax [Line Items]
Increase (decrease) in non-cash deferred income tax asset valuation allowance						$ 9.0
Canada Revenue Agency \| U.S. - Canada APA \| Canadian Subsidiary \| Earliest Tax Year
Income Tax [Line Items]
Effective tax year						2005
Canada Revenue Agency \| U.S. - Canada APA \| Canadian Subsidiary \| Latest Tax Year
Income Tax [Line Items]
Effective tax year						2015
Canada Revenue Agency \| Canada - Germany APA \| Canadian Subsidiary \| Earliest Tax Year
Income Tax [Line Items]
Effective tax year						2005
Canada Revenue Agency \| Canada - Germany APA \| Canadian Subsidiary \| Latest Tax Year
Income Tax [Line Items]
Effective tax year						2017
Canada Revenue Agency and German Federal Central Tax Office \| Canada - Germany APA \| Canadian and German Subsidiaries
Income Tax [Line Items]
Non-cash income tax benefit related to reversal of reserve for uncertain tax positions	8.1
Germany
Income Tax [Line Items]
Deferred tax assets valuation allowances								$ 153.0
Germany \| Expected Future Periods Net Operating Loss Utilization
Income Tax [Line Items]
Increase (decrease) in non-cash deferred income tax asset valuation allowance			(141.9)
Germany \| Corporate Purposes
Income Tax [Line Items]
Net operating loss carryforwards								638.0
Germany \| Trade Tax Purposes
Income Tax [Line Items]
Net operating loss carryforwards								71.0
Germany \| Canada Revenue Agency and German Federal Central Tax Office \| Canada - Germany APA \| Canadian and German Subsidiaries
Income Tax [Line Items]
Non-cash income tax benefit related to increase in German NOLs	2.6
Cash tax refund	0.6
Belgium
Income Tax [Line Items]
Deferred tax assets valuation allowances								20.0
Belgium \| Expected Future Periods Net Operating Loss Utilization
Income Tax [Line Items]
Increase (decrease) in non-cash deferred income tax asset valuation allowance			$ (8.0)
Belgium \| Corporate Purposes
Income Tax [Line Items]
Net operating loss carryforwards								93.0
Germany and Belgian
Income Tax [Line Items]
Increase (decrease) in non-cash deferred income tax asset valuation allowance						$ (170.4)
Deferred tax assets valuation allowances								173.0
Germany and Belgian \| Current Periods Net Operating Loss Utilization
Income Tax [Line Items]
Increase (decrease) in non-cash deferred income tax asset valuation allowance	$ (7.8)				$ (12.7)			$ (2.2)

Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 395.0
Ending Balance	$ 710.7		710.7
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(245.8)	$ (242.6)	(269.6)	$ (252.0)
Other comprehensive income (loss)	29.9	9.0	53.7	18.4
Ending Balance	(215.9)	(233.6)	(215.9)	(233.6)
Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	1.2	(0.4)	1.8	(0.6)
Other comprehensive income (loss)	(0.6)	0.9	(1.2)	1.1
Ending Balance	0.6	0.5	0.6	0.5
Accumulated Defined Benefit Plans Adjustment \| Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(180.9)	(153.4)	(184.8)	(159.2)
Other comprehensive income (loss)	2.4	2.9	6.3	8.7
Ending Balance	(178.5)	(150.5)	(178.5)	(150.5)
Accumulated Defined Benefit Plans Adjustment \| OPEB Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	1.6	1.9	1.8	2.1
Other comprehensive income (loss)		(0.1)	(0.2)	(0.3)
Ending Balance	1.6	1.8	1.6	1.8
Interest Rate Swap
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1.8)	(6.0)	(2.0)	(2.3)
Other comprehensive income (loss)	(0.7)	0.2	(1.5)	(4.6)
Less reclassification adjustment for amounts included in earnings	2.5	0.6	3.5	1.7
Ending Balance		(5.2)		(5.2)
Total Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(425.7)	(400.5)	(452.8)	(412.0)
Other comprehensive income (loss)	33.5	13.5	60.6	25.0
Ending Balance	$ (392.2)	$ (387.0)	$ (392.2)	$ (387.0)

Commitments and contingencies - Additional Information (Detail)	Sep. 30, 2017 Litigation
Commitments And Contingencies Disclosure [Abstract]
Number of pending matters	2

Financial Instruments - Valuation of Financial Instruments Recorded on Fair Value Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncurrent marketable securities	$ 4.3	$ 6.0
Fair Value Measurements Recurring
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate swap contract		(3.1)
Noncurrent marketable securities	4.3	6.0
Fair Value Measurements Recurring \| Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncurrent marketable securities	$ 4.3	6.0
Fair Value Measurements Recurring \| Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest rate swap contract		$ (3.1)

- Definition

+ References + Details

Financial Instruments - Additional Information (Detail)	3 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended
Financial Instruments - Additional Information (Detail)	Sep. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Sep. 30, 2017 USD ($) DerivativeContract	Dec. 31, 2016 DerivativeContract	Sep. 30, 2017 EUR (€)	Dec. 31, 2015 USD ($)
Financial Instrument At Fair Value [Line Items]
Interest rate swap termination payment included in cash paid for interest			$ 3,300,000
Term Loan
Financial Instrument At Fair Value [Line Items]
Termination of interest rate swap contract	$ 3,300,000
Senior Notes
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount \| €					€ 1,000
Debt instrument estimated market price per €1000 principal amount \| €					€ 1,019
Currency Forward Contracts
Financial Instrument At Fair Value [Line Items]
Number of derivative contacts outstanding \| DerivativeContract			0	0
Interest Rate Swap
Financial Instrument At Fair Value [Line Items]
Pretax unrealized loss recognized in other comprehensive income (loss) related to interest rate swap contract		$ 2,300,000
Gain loss recognized in earnings on hedge ineffectiveness			$ 0
Interest Rate Swap \| Interest Expense
Financial Instrument At Fair Value [Line Items]
Reclassified from accumulated other comprehensive loss in to earnings		$ 2,100,000
Interest Rate Swap \| London Interbank Offered Rate (LIBOR)
Financial Instrument At Fair Value [Line Items]
Derivative, type of instrument			pay-fixed/receive-variable interest rate swap
Interest rate swap, type of interest rate			fixed
Interest rate swap, fixed rate	2.016%		2.016%		2.016%
Interest rate swap, floor rate	1.00%		1.00%		1.00%
Interest rate swap, effective date			Sep. 30, 2015
Derivative instrument, notional amount						$ 344,800,000
Interest rate swap, notional amount decline each quarter	$ 875,000		$ 875,000
Interest rate swap, notional amount decline commencing date			Dec. 31, 2015
Interest rate swap, original final maturity date			Feb. 29, 2020

Financial Instruments - Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Cash, cash equivalents and restricted cash, Carrying amount	$ 318.0	$ 52.3	$ 93.3	$ 94.3
Fixed rate Senior Notes, Carrying amount	464.2
Variable rate term loan, Carrying amount		335.9
Common stockholders' equity, Carrying amount	710.7	395.0
Cash, cash equivalents and restricted cash, Fair value	318.0	52.3
Fixed rate Senior Notes, Fair value	480.4
Variable rate term loan, Fari value		334.6
Common stockholders' equity, Fair value	$ 2,646.0	$ 1,383.8

Recent Accounting Pronouncements Not Yet Adopted - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Service cost	$ 9.9
Net periodic defined benefit pension costs	$ 22.0