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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Nov. 01, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	KRO
Security Exchange Name	NYSE
Title of 12(b) Security	Common stock
Entity Registrant Name	KRONOS WORLDWIDE INC
Entity Central Index Key	0001257640
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		115,651,706
Entity File Number	1-31763
Entity Tax Identification Number	76-0294959
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	5430 LBJ Freeway
Entity Address, Address Line Two	Suite 1700
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75240-2620
City Area Code	972
Local Phone Number	233-1700
Document Quarterly Report	true
Document Transition Report	false

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 385.8	$ 373.3
Restricted cash	1.1	1.4
Accounts and other receivables	348.3	312.5
Inventories, net	434.9	497.9
Prepaid expenses and other	16.8	16.3
Total current assets	1,186.9	1,201.4
Other assets:
Investment in TiO2 manufacturing joint venture	83.1	81.3
Marketable securities	3.3	3.4
Note receivable from Valhi	5.0
Operating lease right-of-use assets	30.1
Deferred income taxes	107.7	122.0
Other	3.3	3.6
Total other assets	232.5	210.3
Property and equipment:
Land	39.3	41.0
Buildings	206.1	211.7
Equipment	1,079.6	1,102.6
Mining properties	113.2	114.0
Construction in progress	45.8	38.0
Gross property and equipment	1,484.0	1,507.3
Less accumulated depreciation and amortization	1,018.5	1,020.9
Net property and equipment	465.5	486.4
Total assets	1,884.9	1,898.1
Current liabilities:
Current maturities of long-term debt	1.5	1.5
Accounts payable and accrued liabilities	224.4	222.9
Income taxes	1.6	9.0
Total current liabilities	227.5	233.4
Noncurrent liabilities:
Long-term debt	434.6	455.1
Accrued pension costs	249.3	262.9
Payable to affiliate - income taxes	56.6	56.6
Operating lease liabilities	23.1
Deferred income taxes	22.0	21.5
Other	24.9	28.8
Total noncurrent liabilities	810.5	824.9
Stockholders' equity:
Common stock	1.2	1.2
Additional paid-in capital	1,397.8	1,399.1
Retained deficit	(121.0)	(136.2)
Accumulated other comprehensive loss	(429.5)	(424.3)
Treasury stock	(1.6)
Total stockholders' equity	846.9	839.8
Total liabilities and stockholders' equity	1,884.9	1,898.1
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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 437.4	$ 410.3	$ 1,358.4	$ 1,312.5
Cost of sales	349.7	291.2	1,051.9	846.8
Gross margin	87.7	119.1	306.5	465.7
Selling, general and administrative expense	56.9	57.3	172.5	173.7
Other operating income (expense):
Currency transactions, net	5.8	(0.6)	5.6	4.2
Other operating expense, net	(3.5)	(3.1)	(11.0)	(10.7)
Income from operations	33.1	58.1	128.6	285.5
Other income (expense):
Interest and dividend income	1.4	1.5	5.2	3.7
Marketable equity securities	(1.9)	(4.3)	(0.1)	(6.7)
Other components of net periodic pension and OPEB cost	(3.8)	(3.7)	(11.4)	(11.3)
Interest expense	(4.6)	(4.9)	(14.1)	(14.7)
Income before income taxes	24.2	46.7	108.2	256.5
Income tax expense	6.3	14.1	30.5	75.5
Net income	$ 17.9	$ 32.6	$ 77.7	$ 181.0
Net income per basic and diluted share	$ 0.16	$ 0.28	$ 0.67	$ 1.56
Weighted average shares used in the calculation of net income per share	115.7	115.9	115.8	115.9

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income	$ 17.9	$ 32.6	$ 77.7	$ 181.0
Other comprehensive income (loss), net of tax:
Currency translation	(18.7)	4.5	(11.7)	(10.0)
Total other comprehensive income (loss), net	(16.6)	6.9	(5.2)	(2.9)
Comprehensive income	1.3	39.5	72.5	178.1
Defined Benefit Pension Plans
Other comprehensive income (loss), net of tax:
Defined benefit plans	2.2	$ 2.4	6.7	7.3
OPEB
Other comprehensive income (loss), net of tax:
Defined benefit plans	$ (0.1)		$ (0.2)	$ (0.2)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings (deficit)	Accumulated other comprehensive income (loss)	Treasury stock
Beginning Balance at Dec. 31, 2017	$ 754.3	$ 1.2	$ 1,399.0	$ (267.2)	$ (378.7)
Change in accounting principle - ASU 2016-01 at Dec. 31, 2017				4.8	(4.8)
Balance as adjusted at Dec. 31, 2017	754.3	1.2	1,399.0	(262.4)	(383.5)
Net income	70.7			70.7
Other comprehensive income (loss), net of tax	13.0				13.0
Dividends paid	(19.7)			(19.7)
Ending Balance at Mar. 31, 2018	818.3	1.2	1,399.0	(211.4)	(370.5)
Beginning Balance at Dec. 31, 2017	754.3	1.2	1,399.0	(267.2)	(378.7)
Change in accounting principle - ASU 2016-01 at Dec. 31, 2017				4.8	(4.8)
Balance as adjusted at Dec. 31, 2017	754.3	1.2	1,399.0	(262.4)	(383.5)
Net income	181.0
Other comprehensive income (loss), net of tax	(2.9)
Ending Balance at Sep. 30, 2018	873.4	1.2	1,399.1	(140.5)	(386.4)
Change in accounting principle - ASU 2016-01 at Sep. 30, 2018					(4.8)
Beginning Balance at Mar. 31, 2018	818.3	1.2	1,399.0	(211.4)	(370.5)
Net income	77.7			77.7
Other comprehensive income (loss), net of tax	(22.8)				(22.8)
Issuance of common stock	0.1		0.1
Dividends paid	(19.7)			(19.7)
Ending Balance at Jun. 30, 2018	853.6	1.2	1,399.1	(153.4)	(393.3)
Balance as adjusted at Jun. 30, 2018					(393.3)
Net income	32.6			32.6
Other comprehensive income (loss), net of tax	6.9				6.9
Dividends paid	(19.7)			(19.7)
Ending Balance at Sep. 30, 2018	873.4	1.2	1,399.1	(140.5)	(386.4)
Change in accounting principle - ASU 2016-01 at Sep. 30, 2018					(4.8)
Beginning Balance at Dec. 31, 2018	839.8	1.2	1,399.1	(136.2)	(424.3)
Balance as adjusted at Dec. 31, 2018					(424.3)
Net income	30.3			30.3
Other comprehensive income (loss), net of tax	2.1				2.1
Dividends paid	(20.9)			(20.9)
Ending Balance at Mar. 31, 2019	851.3	1.2	1,399.1	(126.8)	(422.2)
Beginning Balance at Dec. 31, 2018	839.8	1.2	1,399.1	(136.2)	(424.3)
Balance as adjusted at Dec. 31, 2018					(424.3)
Net income	77.7
Other comprehensive income (loss), net of tax	(5.2)
Treasury stock acquired		(3.0)
Treasury stock retired		1.4
Ending Balance at Sep. 30, 2019	846.9	1.2	1,397.8	(121.0)	(429.5)	$ (1.6)
Beginning Balance at Mar. 31, 2019	851.3	1.2	1,399.1	(126.8)	(422.2)
Net income	29.5			29.5
Other comprehensive income (loss), net of tax	9.3				9.3
Issuance of common stock	0.1		0.1
Dividends paid	(20.8)			(20.8)
Treasury stock acquired	(1.4)					(1.4)
Ending Balance at Jun. 30, 2019	868.0	1.2	1,399.2	(118.1)	(412.9)	(1.4)
Balance as adjusted at Jun. 30, 2019					(412.9)
Net income	17.9			17.9
Other comprehensive income (loss), net of tax	(16.6)				(16.6)
Dividends paid	(20.8)			(20.8)
Treasury stock acquired	(1.6)					(1.6)
Treasury stock retired			(1.4)			1.4
Ending Balance at Sep. 30, 2019	$ 846.9	$ 1.2	$ 1,397.8	$ (121.0)	$ (429.5)	$ (1.6)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (unaudited) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Cash dividends per share	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.17	$ 0.17
Retained earnings (deficit)
Cash dividends per share	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.17	$ 0.17

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 77.7	$ 181.0
Depreciation	34.3	36.9
Amortization of operating lease right-of-use assets	5.1
Deferred income taxes	6.7	20.5
Benefit plan expense greater than cash funding	7.1	6.5
Marketable equity securities	0.1	6.7
Distributions from (contributions to) TiO2 manufacturing joint venture, net	(1.8)	5.5
Other, net	1.7	1.8
Change in assets and liabilities:
Accounts and other receivables	(59.9)	(25.6)
Inventories	52.1	(70.3)
Prepaid expenses	(1.9)	(8.1)
Accounts payable and accrued liabilities	5.0	13.0
Income taxes	(3.7)	11.9
Accounts with affiliates	2.1	17.1
Other, net	(0.8)	2.1
Net cash provided by operating activities	123.8	199.0
Cash flows from investing activities:
Capital expenditures	(34.2)	(35.4)
Net cash used in investing activities	(39.2)	(21.8)
Cash flows from financing activities:
Payments on long-term debt	(0.6)	(0.5)
Dividends paid	(62.5)	(59.1)
Treasury stock acquired	(3.0)
Net cash used in financing activities	(66.1)	(59.6)
Cash, cash equivalents and restricted cash - net change from:
Operating, investing and financing activities	18.5	117.6
Currency translation	(6.3)	(7.9)
Balance at beginning of period	374.7	323.7
Balance at end of period	386.9	433.4
Cash paid for:
Interest, net of amount capitalized	17.3	18.3
Income taxes	32.3	36.4
Accrual for capital expenditures	1.6	3.5
Valhi
Cash flows from investing activities:
Loans	(10.9)	(2.6)
Collections	$ 5.9	$ 16.2

Organization and Basis of Presentation

9 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Basis of Presentation

Note 1 - Organization and basis of presentation:

Organization - At September 30, 2019, 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 (“Contran”) held approximately 92% of Valhi’s outstanding common stock. At September 30, 2019, a majority of Contran’s outstanding voting stock is held directly by Lisa K. Simmons and Serena Simmons Connelly and various family trusts established for the benefit of Ms. Simmons and Ms. Connelly and their children and for which Ms. Simmons or Ms. Connelly, as applicable, serves as trustee. In addition, each of Ms. Simmons and Ms. Connelly serves as co-chair of the Contran board of directors. The remainder of Contran’s outstanding voting stock is held by another trust (the “Family Trust”), which was established for the benefit of Ms. Simmons and Ms. Connelly and their children and for which a third-party financial institution serves as trustee. Consequently, at September 30, 2019, Ms. Simmons, Ms. Connelly and the Family Trust may be deemed to control Contran, and therefore may be deemed to indirectly control the wholly-owned subsidiary of 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, 2018 that we filed with the Securities and Exchange Commission (SEC) on March 11, 2019 (2018 Annual Report). In our opinion, we have made all necessary adjustments (which include only normal recurring adjustments), 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, 2018 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, 2018) 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, 2019 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 2018 Consolidated Financial Statements contained in our 2018 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, 2019

Receivables [Abstract]

Accounts and Other Receivables

Note 2 - Accounts and other receivables:

	December 31,			September 30,
	2018			2019
	(In millions)
Trade receivables	$	273.3		$	333.9
Recoverable VAT and other receivables		23.8			14.3
Receivables from affiliates:
Louisiana Pigment Company, L.P. (LPC)		10.2			-
Other		2.8			2.0
Refundable income taxes		3.6			.1
Allowance for doubtful accounts		(1.2	)		(2.0	)
Total	$	312.5		$	348.3

Inventories, Net

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Inventories, Net

Note 3 - Inventories, net:

	December 31,		September 30,
	2018		2019
	(In millions)
Raw materials	$	93.1	$	117.2
Work in process		23.5		29.0
Finished products		316.8		222.9
Supplies		64.5		65.8
Total	$	497.9	$	434.9

Marketable Securities

9 Months Ended

Sep. 30, 2019

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. Any unrealized gains or losses on the securities are recognized in Marketable equity securities on our Condensed Consolidated Statements of Income. The fair value of our equity securities represent a Level 1 input within the fair value hierarchy. See Note 15.

	Fair value
	measurement	Market		Cost
Marketable security	level	value		basis		Unrealized gain
		(In millions)
December 31, 2018:
Valhi common stock	1	$	3.3	$	3.2	$	.1
NL and CompX common stocks	1		.1		.1		-
Total		$	3.4	$	3.3	$	.1

September 30, 2019:
Valhi common stock	1	$	3.2	$	3.2	$	-
NL and CompX common stocks	1		.1		.1		-
Total		$	3.3	$	3.3	$	-

At December 31, 2018 and September 30, 2019, 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, 2018 and September 30, 2019, the quoted per share market price of Valhi’s common stock was $1.93 and $1.90, 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.

Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

Note 5 - Leases:

We enter into various arrangements (or leases) that convey the rights to use and control identified underlying assets for a period of time in exchange for consideration. We lease various manufacturing facilities and equipment. In addition, our principal German operating subsidiary leases the land under its Leverkusen TiO₂ production facility pursuant to a lease with Bayer AG that expires in 2050. The Leverkusen facility itself, which we own and which represents approximately one-third of our current TiO₂ production capacity, is located within Bayer’s extensive manufacturing complex. From time to time, we may also enter into an arrangement in which the right to use and control an identified underlying asset is embedded in another type of contract.

On January 1, 2019 we adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842). See Note 16. We determine if an arrangement is a lease (including leases embedded in another type of contract) at inception. All of our leases are classified as operating leases under this new ASU. Operating leases are included in operating lease right-of-use assets, current operating lease liabilities and noncurrent operating lease liabilities in our Condensed Consolidated Balance Sheet beginning January 1, 2019. See Note 8.

Right-of-use assets represent our right to use an underlying asset for the lease term and operating lease liabilities represent our obligation to make lease payments arising from the lease. For leases in effect as of the January 1, 2019 date of adoption of the new ASU, the right-of-use operating lease assets and liabilities were recognized based on the estimated present value of remaining lease payments over the remaining lease term as of the adoption date. For new leases entered into subsequent to the date of adoption of the new ASU, the right-of-use operating lease assets and liabilities are recognized based on the estimated present value of lease payments over the lease term as of the respective lease commencement dates.

We use an estimated incremental borrowing rate to determine the present value of lease payments (unless we can determine the rate implicit in the lease, which is generally not the case). Our incremental borrowing rate for each of our leases is derived from available information, including our current debt and credit facilities and U.S. and European yield curves as well as publicly available data for instruments with similar characteristics, adjusted for factors such as collateralization and term. For leases in effect as of the January 1, 2019 date of adoption of the new ASU, we used an estimated incremental borrowing rate for each lease on the date of adoption. For new leases entered into subsequent to the date of adoption of the new ASU, we use an estimated incremental borrowing rate for each lease as of the respective lease commencement date.

Our leases generally do not include termination or purchase options. Certain of our leases include an option to renew the lease after expiration of the initial lease term, but we have not included such renewal periods in our lease term because it is not reasonably certain that we would exercise the renewal option. Our leases generally have fixed lease payments, with no contingent or incentive payments. Certain of our leases include variable lease payments that depend on a specified index or rate, and in accordance with ASU 2016-02 the determination of the operating lease liabilities is based on the index or rate existing at the date of adoption of the new ASU (for leases in effect as of January 1, 2019) or the index or rate in effect as of the lease commencement date (for leases entered into subsequent to the date of adoption of the new ASU). Our lease agreements do not contain any residual value guarantees.

With respect to our land lease associated with our Leverkusen facility, we periodically establish the amount of rent for such land lease by agreement with Bayer for periods of at least two years at a time. The lease agreement provides for no formula, index or other mechanism to determine changes in the rent of such land lease; rather, any change in the rent is subject solely to periodic negotiation between Bayer and us. As such, we will account for any change in the rent associated with such lease subsequent to the January 1, 2019 adoption of the new ASU as a lease modification.

During the first nine months of 2019, our operating lease expense approximated $6.2 million (which amount approximates the amount of cash paid during the period for our operating leases included in the determination of our cash flows from operating activities). During the first nine months of 2019, variable lease expense and short-term lease expense were not material. During the first nine months of 2019, we entered into new operating leases which resulted in the recognition of $1.4 million in right-of-use operating lease assets and corresponding liabilities on our Condensed Consolidated Balance Sheet. At September 30, 2019, the weighted average remaining lease term of our operating leases was approximately 13 years, and the weighted average discount rate associated with such leases was approximately 4.6%. Such average remaining lease term is weighted based on each arrangement’s lease obligation, and such average discount rate is weighted based on each arrangement’s total remaining lease payments.

At September 30, 2019, maturities of our operating lease liabilities were as follows:

Years ending December 31,	Amount
	(In millions)
2019 (remainder of year)	$	2.0
2020		6.9
2021		6.1
2022		3.5
2023		2.3
2024 and thereafter		20.8
Total remaining lease payments		41.6
Less imputed interest		12.1
Total lease obligations		29.5
Less current obligations		6.4
Long term lease obligations	$	23.1

Approximately $6.9 million of the $29.5 million total lease obligations at September 30, 2019 relates to our Leverkusen facility lease discussed above.

At September 30, 2019, we have no significant lease commitments that have not yet commenced.

Disclosures related to periods prior to adoption of the New Lease Standard

Net rent expense approximated $14 million in 2016, $16 million in 2017 and $15 million in 2018. At December 31, 2018, future minimum payments under non-cancellable operating leases having an initial or remaining term of more than one year were as follows:

Years ending December 31,	Amount
	(In millions)
2019	$	6.2
2020		5.0
2021		4.2
2022		3.2
2023		2.4
2024 and thereafter		21.5
Long term lease obligations	$	42.5

Approximately $17 million of the $42.5 million aggregate future minimum rental commitments at December 31, 2018 relates to our Leverkusen facility lease discussed above. The minimum commitment amounts for such lease included in the table above for each year through the 2050 expiration of the lease are based upon the current annual rental rate as of December 31, 2018.

Other Noncurrent Assets

9 Months Ended

Sep. 30, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Noncurrent Assets

Note 6 - Other noncurrent assets:

	December 31,		September 30,
	2018		2019
	(In millions)
Pension asset	$	.8	$	1.3
Deferred financing costs, net		.9		.7
Other		1.9		1.3
Total	$	3.6	$	3.3

Long-Term debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Long-Term Debt

Note 7 - Long-term debt:

	December 31,		September 30,
	2018		2019
	(In millions)
Kronos International, Inc. 3.75% Senior Secured Notes	$	452.4	$	432.3
Other		4.2		3.8
Total debt		456.6		436.1
Less current maturities		1.5		1.5
Total long-term debt	$	455.1	$	434.6

Senior Secured Notes - At September 30, 2019, the carrying value of our 3.75% Senior Secured Notes due September 15, 2025 (€400 million aggregate principal amount outstanding) is stated net of unamortized debt issuance costs of $5.3 million.

Revolving credit facilities - During the first nine months of 2019, we had no borrowings or repayments under our North American revolving credit facility and our European revolving credit facility. At September 30, 2019, approximately $118.4 million was available for borrowing under the North American revolving credit facility. 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, 2019 and the net debt to EBITDA financial test, the full €90.0 million amount of the credit facility ($98.5 million) is available for borrowing at September 30, 2019.

Other - We are in compliance with all of our debt covenants at September 30, 2019.

Accounts Payable and Accrued Liabilities

9 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Accounts Payable and Accrued Liabilities

Note 8 - Accounts payable and accrued liabilities:

	December 31,		September 30,
	2018		2019
	(In millions)
Accounts payable	$	103.2	$	113.2
Employee benefits		27.9		25.1
Accrued sales discounts and rebates		29.7		25.0
Operating lease liabilities		-		6.4
Payables to affiliates:
LPC		16.7		13.3
Income taxes, net - Valhi		10.4		5.4
Other		35.0		36.0
Total	$	222.9	$	224.4

Other Noncurrent Liabilities

9 Months Ended

Sep. 30, 2019

Other Liabilities Disclosure [Abstract]

Other Noncurrent Liabilities

Note 9 - Other noncurrent liabilities:

	December 31,		September 30,
	2018		2019
	(In millions)
Accrued postretirement benefits	$	7.4	$	7.7
Employee benefits		7.3		6.3
Other		14.1		10.9
Total	$	28.8	$	24.9

Revenue Recognition

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Revenue Recognition

Note 10 - Revenue recognition:

The following table disaggregates our net sales by place of manufacture (point of origin) and to the location of the customer (point of destination), which are the categories that depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.

	Three months ended						Nine months ended
	September 30,						September 30,
	2018			2019			2018			2019
	(In millions)
Net sales - point of origin:
Germany	$	211.9		$	238.3		$	704.1		$	706.0
United States		234.5			227.7			640.2			762.3
Canada		82.3			84.0			236.1			258.4
Belgium		66.4			58.3			205.0			205.7
Norway		49.8			46.0			159.4			145.2
Eliminations		(234.6	)		(216.9	)		(632.3	)		(719.2	)
Total	$	410.3		$	437.4		$	1,312.5		$	1,358.4

Net sales - point of destination:
Europe	$	191.8		$	201.6		$	664.2		$	646.2
North America		142.0			147.8			412.6			456.1
Other		76.5			88.0			235.7			256.1
Total	$	410.3		$	437.4		$	1,312.5		$	1,358.4

Employee Benefit Plans

9 Months Ended

Sep. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

Note 11 - Employee 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,
	2018			2019			2018			2019
	(In millions)
Service cost	$	2.9		$	2.7		$	8.8		$	8.3
Interest cost		3.5			3.5			10.7			10.5
Expected return on plan assets		(3.3	)		(3.1	)		(9.9	)		(9.3	)
Amortization of prior service cost		.1			.1			.2			.2
Recognized actuarial losses		3.3			3.3			10.3			10.0
Total	$	6.5		$	6.5		$	20.1		$	19.7

We expect our 2019 contributions for our pension plans to be approximately $17 million.

Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Note 12 - Income taxes:

	Three months ended						Nine months ended
	September 30,						September 30,
	2018			2019			2018			2019
	(In millions)
Expected tax expense, at U.S. federal statutory income tax rate of 21%	$	9.8		$	5.1		$	53.9		$	22.7
Non-U.S. tax rates		3.6			1.2			18.6			5.9
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies		1.8			(1.1	)		2.9			(2.2	)
Global intangible low-tax income, net		-			.1			-			1.6
Transition tax		(1.7	)		-			(1.7	)		-
Adjustment to reserve for uncertain tax positions, net		-			.2			1.4			.6
Canada-Germany APA		-			-			(1.4	)		-
Other, net		.6			.8			1.8			1.9
Income tax expense	$	14.1		$	6.3		$	75.5		$	30.5

Comprehensive provision for income taxes allocable to:
Net income	$	14.1		$	6.3		$	75.5		$	30.5
Other comprehensive income (loss):
Pension plans		1.0			1.2			3.2			3.6
OPEB plans		-			-			(.1	)		(.1	)
Total	$	15.1		$	7.5		$	78.6		$	34.0

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 21%. 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) deferred state and non-U.S. income taxes (or deferred income tax benefits) and deferred withholding taxes, as applicable, associated with the current-year change in the aggregate amount of undistributed earnings of all of our non-U.S. subsidiaries, which earnings are not permanently reinvested and (ii) current U.S. income taxes (or current income tax benefit) 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.

We record global intangible low-tax income (GILTI) tax as a current-period expense when incurred under the period cost method. We have evaluated the tax impact of GILTI and base erosion anti abuse tax (BEAT) provisions and related U.S. tax credit provisions applicable to tax years beginning in 2018 based on the relevant statutes, including final GILTI and foreign tax credit regulations issued by the IRS in June 2019 which did not materially impact our determinations with respect to such items.

None of our U.S. and non-U.S. tax returns are currently under examination. As a result of prior audits in certain jurisdictions, which are now settled, in 2008 we filed Advance Pricing Agreement Requests with the tax authorities in the U.S., Canada and Germany. During the first quarter of 2018, our German subsidiary executed and finalized the related Advance Pricing Agreement with the Competent Authority for Germany (the “Canada-Germany APA”) effective for tax years 2005 - 2017. In the first quarter of 2018, we recognized a net $1.4 million non-cash income tax benefit related to an APA tax settlement payment between our German and Canadian subsidiaries.

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 any future tax examinations should not have a material adverse effect on our consolidated financial position, results of operations or liquidity. We do not expect our unrecognized tax benefits to materially change during the next twelve months.

Stockholders' equity

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Stockholders' equity

Note 13 – Stockholders’ equity:

Changes in accumulated other comprehensive loss are presented in the table below. See Note 4 for further discussion of our marketable securities and Note 11 for discussion of our defined benefit pension plans.

	Three months ended						Nine months ended
	September 30,						September 30,
	2018			2019			2018			2019
	(In millions)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(226.4	)	$	(238.0	)	$	(211.9	)	$	(245.0	)
Other comprehensive income (loss)		4.5			(18.7	)		(10.0	)		(11.7	)
Balance at end of period	$	(221.9	)	$	(256.7	)	$	(221.9	)	$	(256.7	)

Defined benefit pension plans:
Balance at beginning of period	$	(167.9	)	$	(175.5	)	$	(172.8	)	$	(180.0	)
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost		2.4			2.2			7.3			6.7
Balance at end of period	$	(165.5	)	$	(173.3	)	$	(165.5	)	$	(173.3	)

OPEB plans:
Balance at beginning of period	$	1.0		$	.6		$	1.2		$	.7
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost		-			(.1	)		(.2	)		(.2	)
Balance at end of period	$	1.0		$	.5		$	1.0		$	.5

Marketable securities:
Balance at beginning of period	$	-		$	-		$	4.8		$	-
Change in accounting principle		-			-			(4.8	)		-
Balance at beginning of period, as adjusted		-			-			-			-
Other comprehensive loss - unrealized losses arising during the period		-			-			-			-
Balance at end of period	$	-		$	-		$	-		$	-

Total accumulated other comprehensive loss:
Balance at beginning of period	$	(393.3	)	$	(412.9	)	$	(378.7	)	$	(424.3	)
Change in accounting principle		-			-			(4.8	)		-
Balance at beginning of period, as adjusted		(393.3	)		(412.9	)		(383.5	)		(424.3	)
Other comprehensive income (loss)		6.9			(16.6	)		(2.9	)		(5.2	)
Balance at end of period	$	(386.4	)	$	(429.5	)	$	(386.4	)	$	(429.5	)

In December 2010, our board of directors authorized the repurchase of up to 2.0 million shares of our common stock in open market transactions, including block purchases, or in privately-negotiated transactions at unspecified prices and over an unspecified period of time. We may repurchase our common stock from time to time as market conditions permit. The stock repurchase program does not include specific price targets or timetables and may be suspended at any time. Depending on market conditions, we may terminate the program prior to its completion. We use cash on hand or other sources of liquidity to acquire the shares. Repurchased shares are added to our treasury and subsequently cancelled upon approval of the board of directors. At December 31, 2018, 1,951,000 shares were available for repurchase under this authorization.

During the first nine months of 2019, we acquired 264,992 shares of our common stock in market transactions for an aggregate purchase price of $3.0 million and subsequently cancelled 110,303, representing $1.4 million, of such shares. At September 30, 2019 an additional 1,686,008 shares are available for repurchase under this stock repurchase program.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 14 - 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 amounts for litigation matters because it is not reasonably possible we have incurred a loss that would be material to our consolidated financial condition, results of operations or liquidity.

Financial Instruments

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Financial Instruments

Note 15 - Financial instruments:

The following table summarizes the valuation of our financial instruments recorded on a fair value basis as of December 31, 2018 and September 30, 2019.

	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:
December 31, 2018 -
Noncurrent marketable securities (See Note 4)	$	3.4	$	3.4	$	-	$	-

September 30, 2019 -
Noncurrent marketable securities (See Note 4)	$	3.3	$	3.3	$	-	$	-

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.

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure:

	December 31, 2018				September 30, 2019
	Carrying amount		Fair value		Carrying amount		Fair value
	(In millions)
Cash, cash equivalents and restricted cash	$	374.7	$	374.7	$	386.9	$	386.9
Long-term debt - Fixed rate Senior Secured Notes		452.4		412.9		432.3		438.0
Common stockholders' equity		839.8		1,335.3		846.9		1,430.6

At September 30, 2019, the estimated market price of our Senior Secured Notes was €1,001 per €1,000 principal amount. The fair value of our Senior Secured Notes is based on quoted market prices; however, these quoted market prices represented Level 2 inputs because the markets in which the Senior Secured Notes trade are 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.

Recent Accounting Pronouncement

9 Months Ended

Sep. 30, 2019

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

Recent Accounting Pronouncement

Note 16 - Recent accounting pronouncement:

On January 1, 2019, we adopted 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 was 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 previously classified as operating leases. ASU 2016-02, as amended, also requires increased qualitative disclosure about leases in addition to quantitative disclosures previously required. As permitted, we adopted this ASU prospectively as of January 1, 2019 with no restatement of prior period financial statements. This ASU permits companies to elect certain practical expedients upon adoption, and at adoption we elected the package of practical expedients related to, among other things, lease classification (in which existing leases classified as operating leases under prior GAAP are classified as an operating lease under the new ASU, and existing leases classified as a capital lease under prior GAAP are classified as a finance lease under the new ASU), nonlease components (in which nonlease components associated with a lease and paid by us to the lessor, such as property taxes, insurance and maintenance, are treated as a lease component and considered part of minimum lease rental payments), and short-term leases (in which leases with an original maturity of 12 months or less are excluded from the recognition requirements of the new ASU). Upon adoption of this new ASU, at January 1, 2019 we recognized an aggregate right-of-use operating lease asset of $35.1 million and a corresponding aggregate operating lease liability of $34.5 million (there was no impact to the opening balance of retained earnings at January 1, 2019 as a result of adopting this new ASU). See Note 5.

Organization and Basis of Presentation (Policies)	9 Months Ended
Organization and Basis of Presentation (Policies)	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	Organization - At September 30, 2019, 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 (“Contran”) held approximately 92% of Valhi’s outstanding common stock. At September 30, 2019, a majority of Contran’s outstanding voting stock is held directly by Lisa K. Simmons and Serena Simmons Connelly and various family trusts established for the benefit of Ms. Simmons and Ms. Connelly and their children and for which Ms. Simmons or Ms. Connelly, as applicable, serves as trustee. In addition, each of Ms. Simmons and Ms. Connelly serves as co-chair of the Contran board of directors. The remainder of Contran’s outstanding voting stock is held by another trust (the “Family Trust”), which was established for the benefit of Ms. Simmons and Ms. Connelly and their children and for which a third-party financial institution serves as trustee. Consequently, at September 30, 2019, Ms. Simmons, Ms. Connelly and the Family Trust may be deemed to control Contran, and therefore may be deemed to indirectly control the wholly-owned subsidiary of 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, 2018 that we filed with the Securities and Exchange Commission (SEC) on March 11, 2019 (2018 Annual Report). In our opinion, we have made all necessary adjustments (which include only normal recurring adjustments), 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, 2018 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, 2018) 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, 2019 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 2018 Consolidated Financial Statements contained in our 2018 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.
Recent Accounting Pronouncement	On January 1, 2019, we adopted 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 was 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 previously classified as operating leases. ASU 2016-02, as amended, also requires increased qualitative disclosure about leases in addition to quantitative disclosures previously required. As permitted, we adopted this ASU prospectively as of January 1, 2019 with no restatement of prior period financial statements. This ASU permits companies to elect certain practical expedients upon adoption, and at adoption we elected the package of practical expedients related to, among other things, lease classification (in which existing leases classified as operating leases under prior GAAP are classified as an operating lease under the new ASU, and existing leases classified as a capital lease under prior GAAP are classified as a finance lease under the new ASU), nonlease components (in which nonlease components associated with a lease and paid by us to the lessor, such as property taxes, insurance and maintenance, are treated as a lease component and considered part of minimum lease rental payments), and short-term leases (in which leases with an original maturity of 12 months or less are excluded from the recognition requirements of the new ASU). Upon adoption of this new ASU, at January 1, 2019 we recognized an aggregate right-of-use operating lease asset of $35.1 million and a corresponding aggregate operating lease liability of $34.5 million (there was no impact to the opening balance of retained earnings at January 1, 2019 as a result of adopting this new ASU). See Note 5.

Accounts and Other Receivables (Tables)

9 Months Ended

Sep. 30, 2019

Receivables [Abstract]

Accounts and Other Receivables

	December 31,			September 30,
	2018			2019
	(In millions)
Trade receivables	$	273.3		$	333.9
Recoverable VAT and other receivables		23.8			14.3
Receivables from affiliates:
Louisiana Pigment Company, L.P. (LPC)		10.2			-
Other		2.8			2.0
Refundable income taxes		3.6			.1
Allowance for doubtful accounts		(1.2	)		(2.0	)
Total	$	312.5		$	348.3

Inventories, Net (Tables)

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Schedule of Inventories, Net

	December 31,		September 30,
	2018		2019
	(In millions)
Raw materials	$	93.1	$	117.2
Work in process		23.5		29.0
Finished products		316.8		222.9
Supplies		64.5		65.8
Total	$	497.9	$	434.9

Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2019

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, 2018:
Valhi common stock	1	$	3.3	$	3.2	$	.1
NL and CompX common stocks	1		.1		.1		-
Total		$	3.4	$	3.3	$	.1

September 30, 2019:
Valhi common stock	1	$	3.2	$	3.2	$	-
NL and CompX common stocks	1		.1		.1		-
Total		$	3.3	$	3.3	$	-

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Schedule of Future Minimum Payment under Non-Cancellable Operating Lease Liabilities

At September 30, 2019, maturities of our operating lease liabilities were as follows:

Years ending December 31,	Amount
	(In millions)
2019 (remainder of year)	$	2.0
2020		6.9
2021		6.1
2022		3.5
2023		2.3
2024 and thereafter		20.8
Total remaining lease payments		41.6
Less imputed interest		12.1
Total lease obligations		29.5
Less current obligations		6.4
Long term lease obligations	$	23.1

At December 31, 2018, future minimum payments under non-cancellable operating leases having an initial or remaining term of more than one year were as follows:

Years ending December 31,	Amount
	(In millions)
2019	$	6.2
2020		5.0
2021		4.2
2022		3.2
2023		2.4
2024 and thereafter		21.5
Long term lease obligations	$	42.5

Other Noncurrent Assets (Tables)

9 Months Ended

Sep. 30, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Schedule of Other Noncurrent Assets

	December 31,		September 30,
	2018		2019
	(In millions)
Pension asset	$	.8	$	1.3
Deferred financing costs, net		.9		.7
Other		1.9		1.3
Total	$	3.6	$	3.3

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Components of Long Term Debt

	December 31,		September 30,
	2018		2019
	(In millions)
Kronos International, Inc. 3.75% Senior Secured Notes	$	452.4	$	432.3
Other		4.2		3.8
Total debt		456.6		436.1
Less current maturities		1.5		1.5
Total long-term debt	$	455.1	$	434.6

- 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

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+ Details

Accounts Payable and Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Components of Accounts Payable and Accrued Liabilities

	December 31,		September 30,
	2018		2019
	(In millions)
Accounts payable	$	103.2	$	113.2
Employee benefits		27.9		25.1
Accrued sales discounts and rebates		29.7		25.0
Operating lease liabilities		-		6.4
Payables to affiliates:
LPC		16.7		13.3
Income taxes, net - Valhi		10.4		5.4
Other		35.0		36.0
Total	$	222.9	$	224.4

Other Noncurrent Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Other Liabilities Disclosure [Abstract]

Components of Other Noncurrent Liabilities

	December 31,		September 30,
	2018		2019
	(In millions)
Accrued postretirement benefits	$	7.4	$	7.7
Employee benefits		7.3		6.3
Other		14.1		10.9
Total	$	28.8	$	24.9

Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Disaggregation of Net Sales by Place of Manufacture and to Location of Customer

	Three months ended						Nine months ended
	September 30,						September 30,
	2018			2019			2018			2019
	(In millions)
Net sales - point of origin:
Germany	$	211.9		$	238.3		$	704.1		$	706.0
United States		234.5			227.7			640.2			762.3
Canada		82.3			84.0			236.1			258.4
Belgium		66.4			58.3			205.0			205.7
Norway		49.8			46.0			159.4			145.2
Eliminations		(234.6	)		(216.9	)		(632.3	)		(719.2	)
Total	$	410.3		$	437.4		$	1,312.5		$	1,358.4

Net sales - point of destination:
Europe	$	191.8		$	201.6		$	664.2		$	646.2
North America		142.0			147.8			412.6			456.1
Other		76.5			88.0			235.7			256.1
Total	$	410.3		$	437.4		$	1,312.5		$	1,358.4

Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

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,
	2018			2019			2018			2019
	(In millions)
Service cost	$	2.9		$	2.7		$	8.8		$	8.3
Interest cost		3.5			3.5			10.7			10.5
Expected return on plan assets		(3.3	)		(3.1	)		(9.9	)		(9.3	)
Amortization of prior service cost		.1			.1			.2			.2
Recognized actuarial losses		3.3			3.3			10.3			10.0
Total	$	6.5		$	6.5		$	20.1		$	19.7

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation

	Three months ended						Nine months ended
	September 30,						September 30,
	2018			2019			2018			2019
	(In millions)
Expected tax expense, at U.S. federal statutory income tax rate of 21%	$	9.8		$	5.1		$	53.9		$	22.7
Non-U.S. tax rates		3.6			1.2			18.6			5.9
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies		1.8			(1.1	)		2.9			(2.2	)
Global intangible low-tax income, net		-			.1			-			1.6
Transition tax		(1.7	)		-			(1.7	)		-
Adjustment to reserve for uncertain tax positions, net		-			.2			1.4			.6
Canada-Germany APA		-			-			(1.4	)		-
Other, net		.6			.8			1.8			1.9
Income tax expense	$	14.1		$	6.3		$	75.5		$	30.5

Comprehensive provision for income taxes allocable to:
Net income	$	14.1		$	6.3		$	75.5		$	30.5
Other comprehensive income (loss):
Pension plans		1.0			1.2			3.2			3.6
OPEB plans		-			-			(.1	)		(.1	)
Total	$	15.1		$	7.5		$	78.6		$	34.0

Stockholders' equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Loss

	Three months ended						Nine months ended
	September 30,						September 30,
	2018			2019			2018			2019
	(In millions)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(226.4	)	$	(238.0	)	$	(211.9	)	$	(245.0	)
Other comprehensive income (loss)		4.5			(18.7	)		(10.0	)		(11.7	)
Balance at end of period	$	(221.9	)	$	(256.7	)	$	(221.9	)	$	(256.7	)

Defined benefit pension plans:
Balance at beginning of period	$	(167.9	)	$	(175.5	)	$	(172.8	)	$	(180.0	)
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost		2.4			2.2			7.3			6.7
Balance at end of period	$	(165.5	)	$	(173.3	)	$	(165.5	)	$	(173.3	)

OPEB plans:
Balance at beginning of period	$	1.0		$	.6		$	1.2		$	.7
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost		-			(.1	)		(.2	)		(.2	)
Balance at end of period	$	1.0		$	.5		$	1.0		$	.5

Marketable securities:
Balance at beginning of period	$	-		$	-		$	4.8		$	-
Change in accounting principle		-			-			(4.8	)		-
Balance at beginning of period, as adjusted		-			-			-			-
Other comprehensive loss - unrealized losses arising during the period		-			-			-			-
Balance at end of period	$	-		$	-		$	-		$	-

Total accumulated other comprehensive loss:
Balance at beginning of period	$	(393.3	)	$	(412.9	)	$	(378.7	)	$	(424.3	)
Change in accounting principle		-			-			(4.8	)		-
Balance at beginning of period, as adjusted		(393.3	)		(412.9	)		(383.5	)		(424.3	)
Other comprehensive income (loss)		6.9			(16.6	)		(2.9	)		(5.2	)
Balance at end of period	$	(386.4	)	$	(429.5	)	$	(386.4	)	$	(429.5	)

Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

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, 2018 and September 30, 2019.

	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:
December 31, 2018 -
Noncurrent marketable securities (See Note 4)	$	3.4	$	3.4	$	-	$	-

September 30, 2019 -
Noncurrent marketable securities (See Note 4)	$	3.3	$	3.3	$	-	$	-

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:

	December 31, 2018				September 30, 2019
	Carrying amount		Fair value		Carrying amount		Fair value
	(In millions)
Cash, cash equivalents and restricted cash	$	374.7	$	374.7	$	386.9	$	386.9
Long-term debt - Fixed rate Senior Secured Notes		452.4		412.9		432.3		438.0
Common stockholders' equity		839.8		1,335.3		846.9		1,430.6

Organization and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019
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, at September 30, 2019, Ms. Simmons, Ms. Connelly and the Family Trust may be deemed to control Contran, and therefore may be deemed to indirectly control the wholly-owned subsidiary of Contran, Valhi, NL and us
Contran \| Valhi Inc
Organization And Basis Of Presentation [Line Items]
Ownership percentage of parent company held by related party	92.00%

Accounts and Other Receivables - Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (2.0)	$ (1.2)
Total	348.3	312.5
Trade receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	333.9	273.3
Recoverable VAT and other receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	14.3	23.8
Other
Accounts Notes And Loans Receivable [Line Items]
Receivables from affiliates	2.0	2.8
Refundable income taxes
Accounts Notes And Loans Receivable [Line Items]
Refundable income taxes	$ 0.1	3.6
Louisiana Pigment Company, L.P. ("LPC'')
Accounts Notes And Loans Receivable [Line Items]
Receivables from affiliates		$ 10.2

Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 117.2	$ 93.1
Work in process	29.0	23.5
Finished products	222.9	316.8
Supplies	65.8	64.5
Total	$ 434.9	$ 497.9

Marketable Securities - Classification of Marketable Securities (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Market value	$ 3.3	$ 3.4
Cost basis	3.3	3.3
Unrealized gain		0.1
Level 1 \| Common stock \| Valhi
Marketable Securities [Line Items]
Market value	3.2	3.3
Cost basis	3.2	3.2
Unrealized gain		0.1
Level 1 \| Common stock \| NL And CompX
Marketable Securities [Line Items]
Market value	0.1	0.1
Cost basis	$ 0.1	$ 0.1

Marketable Securities - Additional Information (Detail) - Valhi Inc - Common stock - $ / shares shares in Millions	Sep. 30, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Investments in publicly-traded shares	1.7	1.7
Quoted market price of per share	$ 1.90	$ 1.93

Leases - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Lessee Lease Description [Line Items]
Operating lease payment	$ 6.2
Operating lease, expense	6.2
Operating lease right-of-use assets	30.1
Operating lease, liability	$ 29.5
Operating lease, weighted average remaining lease term	13 years
Operating lease, weighted average discount rate	4.60%
Aggregate future minimum rental commitments	$ 41.6	$ 42.5
New Operating Leases
Lessee Lease Description [Line Items]
Operating lease right-of-use assets	1.4
Operating lease, liability	$ 1.4
Non-cancellable Operating Leases
Lessee Lease Description [Line Items]
Operating lease, expense		15.0	$ 16.0	$ 14.0
Aggregate future minimum rental commitments		42.5
Leverkusen Facility Lease
Lessee Lease Description [Line Items]
Agreements expiry period	2050
Current Tio2 production capacity in Leverkusen facility	33.00%
Operating lease, liability	$ 6.9
Leverkusen Facility Lease \| Non-cancellable Operating Leases
Lessee Lease Description [Line Items]
Aggregate future minimum rental commitments		$ 17.0

Leases - Schedule of Future Minimum Payment under Non-Cancellable Operating Lease Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
2019 (remainder of year)	$ 2.0
2019		$ 6.2
2020	6.9	5.0
2021	6.1	4.2
2022	3.5	3.2
2023	2.3	2.4
2024 and thereafter	20.8	21.5
Total remaining lease payments	41.6	$ 42.5
Less imputed interest	12.1
Total lease obligations	29.5
Less current obligations	6.4
Operating lease liabilities	$ 23.1

Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Disclosure Other Non Current Assets Schedule Of Other Non Current Assets [Abstract]
Pension asset	$ 1.3	$ 0.8
Deferred financing costs, net	0.7	0.9
Other	1.3	1.9
Total	$ 3.3	$ 3.6

Long-Term Debt - Components of Long-Term Debt (Detail) € in Millions, $ in Millions	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Secured Notes	$ 432.3		$ 452.4
Other	3.8		4.2
Total debt	436.1		456.6
Less current maturities	1.5		1.5
Total long-term debt	434.6		455.1
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Secured Notes	$ 432.3	€ 400	$ 452.4

Long-Term Debt - Senior Secured Notes - Additional Information (Detail) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 432.3		$ 452.4
Kronos International, Inc \| 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 432.3	€ 400	$ 452.4
Debt instrument interest rate	3.75%	3.75%
Unamortized debt issuance costs	$ 5.3
Debt instrument maturity date	Sep. 15, 2025

Long-Term Debt - Revolving Credit Facilities - Additional Information (Detail) - 9 months ended Sep. 30, 2019 € in Millions	USD ($)	EUR (€)
European Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings under credit facility during the period	$ 0
Repayments of Lines of Credit	0
Amount available for Borrowing	98,500,000	€ 90.0
North American Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings under credit facility during the period	0
Repayments of Lines of Credit	0
Amount available for Borrowing	$ 118,400,000

Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Accounts Payable And Accrued Liabilities [Line Items]
Accounts payable	$ 113.2	$ 103.2
Employee benefits	25.1	27.9
Accrued sales discounts and rebates	25.0	29.7
Operating lease liabilities	6.4
Other	36.0	35.0
Total	224.4	222.9
LPC
Accounts Payable And Accrued Liabilities [Line Items]
Payables to affiliate	13.3	16.7
Valhi \| Income taxes, net
Accounts Payable And Accrued Liabilities [Line Items]
Payables to affiliate	$ 5.4	$ 10.4

Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other Liabilities Noncurrent [Abstract]
Accrued postretirement benefits	$ 7.7	$ 7.4
Employee benefits	6.3	7.3
Other	10.9	14.1
Total	$ 24.9	$ 28.8

Revenue Recognition - Disaggregation of Net Sales by Place of Manufacture and to Location of Customer (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 437.4	$ 410.3	$ 1,358.4	$ 1,312.5
Point of origin \| Reportable Geographical Components \| Germany
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	238.3	211.9	706.0	704.1
Point of origin \| Reportable Geographical Components \| United States
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	227.7	234.5	762.3	640.2
Point of origin \| Reportable Geographical Components \| Canada
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	84.0	82.3	258.4	236.1
Point of origin \| Reportable Geographical Components \| Belgium
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	58.3	66.4	205.7	205.0
Point of origin \| Reportable Geographical Components \| Norway
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	46.0	49.8	145.2	159.4
Point of origin \| Eliminations
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	(216.9)	(234.6)	(719.2)	(632.3)
Point of destination \| Europe
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	201.6	191.8	646.2	664.2
Point of destination \| North America
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	147.8	142.0	456.1	412.6
Point of destination \| Other
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 88.0	$ 76.5	$ 256.1	$ 235.7

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.7	$ 2.9	$ 8.3	$ 8.8
Interest cost	3.5	3.5	10.5	10.7
Expected return on plan assets	(3.1)	(3.3)	(9.3)	(9.9)
Amortization of prior service cost	0.1	0.1	0.2	0.2
Recognized actuarial losses	3.3	3.3	10.0	10.3
Total	$ 6.5	$ 6.5	$ 19.7	$ 20.1

Employee Benefit Plans - Additional Information (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Compensation And Retirement Disclosure [Abstract]
Expected contributions for pension plans in 2019	$ 17

Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule Of Income Tax [Line Items]
Expected tax expense, at U.S. federal statutory income tax rate of 21%	$ 5.1	$ 9.8	$ 22.7	$ 53.9
Non-U.S. tax rates	1.2	3.6	5.9	18.6
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies	(1.1)	1.8	(2.2)	2.9
Global intangible low-tax income, net	0.1		1.6
Transition tax		(1.7)		(1.7)
Adjustment to reserve for uncertain tax positions, net	0.2		0.6	1.4
Other, net	0.8	0.6	1.9	1.8
Income tax expense	6.3	14.1	30.5	75.5
Comprehensive provision for income taxes allocable to:
Net income	6.3	14.1	30.5	75.5
Other comprehensive income (loss):
Total	7.5	15.1	34.0	78.6
Defined Benefit Pension Plans
Other comprehensive income (loss):
Benefit plans	$ 1.2	$ 1.0	3.6	3.2
OPEB
Other comprehensive income (loss):
Benefit plans			$ (0.1)	(0.1)
Canada - Germany APA
Schedule Of Income Tax [Line Items]
Canada-Germany APA				$ (1.4)

Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
U.S. Federal statutory income tax rate	21.00%

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Sep. 30, 2019
Income Tax [Line Items]
U.S. Federal statutory income tax rate		21.00%
Canada - Germany APA
Income Tax [Line Items]
Advance Pricing Agreement, description		None of our U.S. and non-U.S. tax returns are currently under examination. As a result of prior audits in certain jurisdictions, which are now settled, in 2008 we filed Advance Pricing Agreement Requests with the tax authorities in the U.S., Canada and Germany.
German Subsidiary \| Canada - Germany APA
Income Tax [Line Items]
Noncash income tax benefit related to APA tax settlement payment	$ 1.4

Stockholders' equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 868.0	$ 853.6	$ 839.8	$ 754.3
Balance as adjusted				754.3
Ending Balance	846.9	873.4	846.9	873.4
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(238.0)	(226.4)	(245.0)	(211.9)
Other comprehensive income (loss)	(18.7)	4.5	(11.7)	(10.0)
Ending Balance	(256.7)	(221.9)	(256.7)	(221.9)
Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				4.8
Change in accounting principle		(4.8)		(4.8)
Accumulated Defined Benefit Plans Adjustment \| Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(175.5)	(167.9)	(180.0)	(172.8)
Other comprehensive income (loss)	2.2	2.4	6.7	7.3
Ending Balance	(173.3)	(165.5)	(173.3)	(165.5)
Accumulated Defined Benefit Plans Adjustment \| OPEB Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	0.6	1.0	0.7	1.2
Other comprehensive income (loss)	(0.1)		(0.2)	(0.2)
Ending Balance	0.5	1.0	0.5	1.0
Total Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(412.9)	(393.3)	(424.3)	(378.7)
Change in accounting principle		(4.8)		(4.8)	$ (4.8)
Balance as adjusted	(412.9)	(393.3)	(424.3)	(383.5)
Other comprehensive income (loss)	(16.6)	6.9	(5.2)	(2.9)
Ending Balance	$ (429.5)	$ (386.4)	$ (429.5)	$ (386.4)

Stockholders' equity - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2010
Accumulated Other Comprehensive Income Loss [Line Items]
Number of shares authorized for repurchase					2,000,000
Shares available for repurchase under the plan	1,686,008		1,686,008	1,951,000
Aggregate purchase price	$ 1.6	$ 1.4
Common stock
Accumulated Other Comprehensive Income Loss [Line Items]
Stock repurchased and acquired in market transactions			264,992
Aggregate purchase price			$ 3.0
Number of shares cancelled			110,303
Treasury stock retired			$ 1.4

Financial Instruments - Valuation of Financial Instruments Recorded on Fair Value Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncurrent marketable securities	$ 3.3	$ 3.4
Fair Value Measurements Recurring
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncurrent marketable securities	3.3	3.4
Fair Value Measurements Recurring \| Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Noncurrent marketable securities	$ 3.3	$ 3.4

Financial Instruments - Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Cash, cash equivalents and restricted cash, Carrying amount	$ 386.9			$ 374.7	$ 433.4			$ 323.7
Long-term debt - Fixed rate Senior Secured Notes, Carrying amount	432.3			452.4
Common stockholders' equity, Carrying amount	846.9	$ 868.0	$ 851.3	839.8	$ 873.4	$ 853.6	$ 818.3	$ 754.3
Cash, cash equivalents and restricted cash, Fair value	386.9			374.7
Long-term debt - Fixed rate Senior Secured Notes, Fair value	438.0			412.9
Common stockholders' equity, Fair value	$ 1,430.6			$ 1,335.3

Financial Instruments - Additional Information (Detail) - Senior Secured Notes	Sep. 30, 2019 EUR (€)
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount	€ 1,000
Debt instrument estimated market price per €1,000 principal amount	€ 1,001

Recent Accounting Pronouncement - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 30.1
Operating lease, liability	$ 29.5
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 35.1
Operating lease, liability		$ 34.5