Kronos Worldwide (KRO) 10-K 9 Mar 22 2021 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 28, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2021
Entity File Number	1-31763
Entity Registrant Name	KRONOS WORLDWIDE, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	76-0294959
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
Title of 12(b) Security	Common stock
Trading Symbol	KRO
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		115,483,456
Entity Public Float			$ 317.9
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001257640
Amendment Flag	false
ICFR Auditor Attestation Flag	true
Documents Incorporated by Reference	The information required by Part III is incorporated by reference from the Registrant’s definitive proxy statement to be filed with the Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this report.
Auditor Name	PricewaterhouseCoopers LLP
Auditor Firm ID	238
Auditor Location	Dallas, Texas

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 406	$ 355.3
Restricted cash	2.1	2
Accounts and other receivables, net	360.7	319.5
Receivables from affiliates	18.4	3.5
Inventories, net	432.3	519
Prepaid expenses and other	38.5	19
Total current assets	1,258	1,218.3
Other assets:
Investment in TiO2 manufacturing joint venture	101.9	103.3
Restricted cash	4.5	4.7
Marketable securities	4.2	2.2
Operating lease right-of-use assets	19.9	26.1
Deferred income taxes	106.8	151
Other	14.1	6.5
Total other assets	251.4	293.8
Property and equipment:
Land	43.9	44.1
Buildings	222.2	233.9
Equipment	1,122.1	1,173.7
Mining properties	129.6	127.8
Construction in progress	72.7	56.1
Gross property and equipment	1,590.5	1,635.6
Less accumulated depreciation and amortization	1,087.1	1,111
Net property and equipment	503.4	524.6
Total assets	2,012.8	2,036.7
Current liabilities:
Current maturities of long-term debt	1.4	0.7
Accounts payable and accrued liabilities	256.9	215.9
Payables to affiliates	18.2	27.9
Income taxes	12.3	15.7
Total current liabilities	288.8	260.2
Noncurrent liabilities:
Long-term debt	449.8	486.7
Accrued pension costs	287.4	372.6
Payable to affiliate - income taxes	44.7	50.6
Operating lease liabilities	15.8	18.8
Deferred income taxes	28.1	24.6
Other	28	26.7
Total noncurrent liabilities	853.8	980
Stockholders' equity:
Common stock, $.01 par value; 240.0 shares authorized; 115.5 shares issued and outstanding	1.2	1.2
Additional paid-in capital	1,395.4	1,395.3
Retained deficit	(122.1)	(151.8)
Accumulated other comprehensive loss	(404.1)	(448.2)
Treasury stock, at cost	(0.2)
Total stockholders' equity	870.2	796.5
Total liabilities and stockholders' equity	2,012.8	2,036.7
Commitments and contingencies (Notes 12 and 15)

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	240	240
Common stock, shares issued	115.5	115.5
Common stock, shares, outstanding	115.5	115.5

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 1,939.4	$ 1,638.8	$ 1,731.1
Cost of sales	1,493.2	1,287.6	1,344.9
Gross margin	446.2	351.2	386.2
Selling, general and administrative expense	248.9	218.6	228.2
Other operating income (expense):
Currency transactions, net	1.6	(4)	2
Other income, net	3.2	1.4	0.9
Corporate expense	(15)	(13.8)	(15.1)
Income from operations	187.1	116.2	145.8
Other income (expense):
Interest and dividend income	0.4	1.8	6.7
Insurance settlement gain		1.5	2.6
Marketable equity securities	2	(1.1)	(0.1)
Other components of net periodic pension and OPEB cost	(16.5)	(19.4)	(15.2)
Interest expense	(19.6)	(19)	(18.7)
Income before income taxes	153.4	80	121.1
Income tax expense	40.5	16.1	34
Net income	112.9	63.9	87.1
Net income - basic	112.9	63.9	87.1
Net income - diluted	$ 112.9	$ 63.9	$ 87.1
Net income per basic share	$ 0.98	$ 0.55	$ 0.75
Net income per diluted share	$ 0.98	$ 0.55	$ 0.75
Weighted average shares outstanding - basic	115.5	115.6	115.8
Weighted average shares outstanding - diluted	115.5	115.6	115.8

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 112.9	$ 63.9	$ 87.1
Other comprehensive income (loss), net of tax:
Currency translation	(7)	13.4	(1.8)
Total other comprehensive income (loss), net	44.1	0.6	(24.5)
Comprehensive income	157	64.5	62.6
Defined Benefit Pension Plans
Other comprehensive income (loss), net of tax:
Defined benefit plans	51.2	(12.3)	(22.2)
OPEB
Other comprehensive income (loss), net of tax:
Defined benefit plans	$ (0.1)	$ (0.5)	$ (0.5)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Common stock	Additional paid-in capital	Retained deficit	Accumulated other comprehensive loss	Treasury stock	Total
Beginning Balance at Dec. 31, 2018	$ 1.2	$ 1,399.1	$ (136.2)	$ (424.3)		$ 839.8
Net income			87.1			87.1
Other comprehensive income (loss), net of tax				(24.5)		(24.5)
Issuance of common stock		0.1				0.1
Dividends paid			(83.4)			(83.4)
Treasury stock acquired					$ (3)	(3)
Treasury stock retired		(3)			3
Ending Balance at Dec. 31, 2019	1.2	1,396.2	(132.5)	(448.8)		816.1
Net income			63.9			63.9
Other comprehensive income (loss), net of tax				0.6		0.6
Issuance of common stock		0.1				0.1
Dividends paid			(83.2)			(83.2)
Treasury stock acquired					(1)	(1)
Treasury stock retired		(1)			1
Ending Balance at Dec. 31, 2020	1.2	1,395.3	(151.8)	(448.2)		796.5
Net income			112.9			112.9
Other comprehensive income (loss), net of tax				44.1		44.1
Issuance of common stock		0.1				0.1
Dividends paid			(83.2)			(83.2)
Treasury stock acquired					(0.2)	(0.2)
Ending Balance at Dec. 31, 2021	$ 1.2	$ 1,395.4	$ (122.1)	$ (404.1)	$ (0.2)	$ 870.2

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retained deficit
Cash dividends per share	$ 0.72	$ 0.72	$ 0.72

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 112.9	$ 63.9	$ 87.1
Depreciation	51.3	58.1	48.1
Amortization of operating lease right-of-use assets	6.6	6.5	6.8
Deferred income taxes	14.3	(3.2)	6.5
Benefit plan expense greater than cash funding	11.9	15.7	11.1
Marketable equity securities	(2)	1.1	0.1
Distributions from (contributions to) TiO2 manufacturing joint venture, net	3.8	(12.8)	(9.3)
Other, net	0.8	0.9	2.5
Change in assets and liabilities:
Accounts and other receivables, net	(58.6)	(4.7)	(6.8)
Inventories, net	65.8	13.3	(7.1)
Prepaid expenses	(20.5)	(3)	0.3
Accounts payable and accrued liabilities	47.2	(33.2)	24.6
Income taxes	(1.6)	6.6	(3.1)
Accounts with affiliates	(26.3)	(4.3)	(0.7)
Other noncurrent assets	(5.1)	(4.6)
Other noncurrent liabilities	6	2.2	0.2
Net cash provided by operating activities	206.5	102.5	160.3
Cash flows from investing activities:
Capital expenditures	(58.6)	(62.8)	(55.1)
Loans			(16.6)
Collections			16.6
Proceeds from insurance settlement		1.5	2.6
Net cash used in investing activities	(58.6)	(61.3)	(52.5)
Cash flows from financing activities:
Payments on long-term debt	(1.4)	(1.1)	(1.5)
Deferred financing fees	(1.9)
Dividends paid	(83.2)	(83.2)	(83.4)
Treasury stock acquired	(0.2)	(1)	(3)
Net cash used in financing activities	(86.7)	(85.3)	(87.9)
Cash, cash equivalents and restricted cash - net change from:
Operating, investing and financing activities	61.2	(44.1)	19.9
Effect of currency exchange rate changes on cash	(10.6)	13.8	(2.3)
Net change for the year	50.6	(30.3)	17.6
Balance at beginning of period	362	392.3	374.7
Balance at end of period	412.6	362	392.3
Cash paid for:
Interest, net of amount capitalized	18	18	17.4
Income taxes	41.6	15.3	35.8
Accrual for capital expenditures	$ 4.8	$ 5.8	$ 9.1

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	​ Note 1 – Summary of significant accounting policies: Organization and basis of presentation – Unless otherwise indicated, references in this report to “we,” “us” or “our” refer to Kronos Worldwide, Inc. and its subsidiaries, taken as a whole. Management’s estimates – Principles of consolidation – Translation of currencies – Cash and cash equivalents – Restricted cash – Marketable securities and securities transactions – Fair Value Measurements and Disclosures ● Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; ● Level 2 – Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the assets or liability; and ● Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable. We classify all of our marketable securities as available-for-sale. Unrealized gains or losses on the securities are recognized in Other income (expense) - Marketable equity securities on our Consolidated Statements of Income. We base realized gains and losses upon the specific identification of the securities sold. See Notes 6 and 10. Accounts receivable – Inventories and cost of sales – Investment in TiO 2 manufacturing joint venture – Leases – 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. Operating leases are included in operating lease right-of-use assets, current operating lease liabilities and noncurrent operating lease liabilities on our Consolidated Balance Sheets. See Note 9. As permitted by ASC Topic 842, Leases 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. 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 facility 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. 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. Our lease agreements do not contain any residual value guarantees. Property and equipment and depreciation – ​ ​ ​ ​ Asset Useful lives Buildings and improvements ​ 10 to 40 years Machinery and equipment 3 to 20 years Mine development costs units-of-production ​ We use accelerated depreciation methods for income tax purposes, as permitted. Upon the sale or retirement of an asset, we remove the related cost and accumulated depreciation from the accounts and recognize any gain or loss in income currently. We expense costs incurred for maintenance, repairs and minor renewals (including planned major maintenance) while we capitalize expenditures for major improvements. We have a governmental concession with an unlimited term to operate our ilmenite mines in Norway. Mining properties consist of buildings and equipment used in our Norwegian ilmenite mining operations. While we own the land and ilmenite reserves associated with the mining operations, such land and reserves were acquired for nominal value and we have no material asset recognized for the land and reserves related to our mining operations. We perform impairment tests when events or changes in circumstances indicate the carrying value may not be recoverable. We consider all relevant factors. We perform the impairment test by comparing the estimated future undiscounted cash flows (exclusive of interest expense) associated with the asset to the asset’s net carrying value to determine if a write-down to fair value is required. Long-term debt – Employee benefit plans – (OPEB), consisting of health care and life insurance benefits, to certain U.S. and Canadian retired employees, which are not material. See Note 11. Income taxes – We recognize deferred income tax assets and liabilities for the expected future tax consequences of temporary differences between the income tax and financial reporting carrying amounts of assets and liabilities, including investments in our subsidiaries and affiliates who are not members of the Contran Tax Group and undistributed earnings of non-U.S. subsidiaries which are not deemed to be permanently reinvested. At December 31, 2021, we continue to assert indefinite reinvestment as it relates to our outside basis difference attributable to our investments in our non-U.S. subsidiaries, other than post-1986 undistributed earnings of our European subsidiaries and all undistributed earnings of our Canadian subsidiary, which are not subject to permanent reinvestment plans. It is not practical for us to determine the amount of the unrecognized deferred income tax liability related to our investments in our non-U.S. subsidiaries which are permanently reinvested due to the complexities associated with our organizational structure, changes in the Tax Cuts and Jobs Act (2017 Tax Act), and the U.S. taxation of such investments in the states in which we operate. Deferred income tax assets and liabilities for each tax-paying jurisdiction in which we operate are netted and presented as either a noncurrent deferred income tax asset or liability, as applicable. We periodically evaluate our deferred tax assets in the various taxing jurisdictions in which we operate and adjust any related valuation allowance based on the estimate of the amount of such deferred tax assets that we believe does not meet the more-likely-than-not recognition criteria. The 2017 Tax Act imposed a tax on global intangible low-tax income (GILTI). We record GILTI tax as a current-period expense when incurred under the period cost method. While our future global operations depend on a number of different factors, we do expect to have future U.S. inclusions in taxable income related to GILTI. We account for the tax effects of a change in tax law as a component of the income tax provision related to continuing operations in the period of enactment, including the tax effects of any deferred income taxes originally established through a financial statement component other than continuing operations (i.e. other comprehensive income). Changes in applicable income tax rates over time as a result of changes in tax law, or times in which a deferred income tax asset valuation allowance is initially recognized in one year and subsequently reversed in a later year, can give rise to “stranded” tax effects in accumulated other comprehensive income in which the net accumulated income tax (benefit) remaining in accumulated other comprehensive income does not correspond to the then-applicable income tax rate applied to the pre-tax amount which resides in accumulated other comprehensive income. As permitted by GAAP, our accounting policy is to remove any such stranded tax effect remaining in accumulated other comprehensive income by recognizing an offset to our provision for income taxes related to continuing operations, only at the time when there is no remaining pre-tax amount in accumulated other comprehensive income. For accumulated other comprehensive income related to currency translation, this would occur only upon the sale or complete liquidation of one of our non-U.S. subsidiaries. For defined pension benefit plans and OPEB plans, this would occur whenever one of our subsidiaries which previously sponsored a defined benefit pension or OPEB plan had terminated such a plan and had no future obligation or plan asset associated with such a plan. We record a reserve for uncertain tax positions for tax positions where we believe that it is more-likely-than-not our position will not prevail with the applicable tax authorities. The amount of the benefit associated with our uncertain tax positions that we recognize is limited to the largest amount for which we believe the likelihood of realization is greater than 50%. We accrue penalties and interest on the difference between tax positions taken on our tax returns and the amount of benefit recognized for financial reporting purposes. We classify our reserves for uncertain tax positions in a separate current or noncurrent liability, depending on the nature of the tax position. See Note 12. Net sales – Revenues from Contracts with Customers, (ASC 606) Revenue is recorded in an amount that reflects the net consideration we expect to receive in exchange for our products. Prices for our products are based on terms specified in published list prices and purchase orders, which generally do not include financing components, noncash consideration or consideration paid to our customers. As our standard payment terms are less than one year, we have elected the practical expedient under ASC 606 and have not assessed whether a contract has a significant financing component. We state sales net of price, early payment, and distributor discounts and volume rebates (collectively, variable consideration). Variable consideration, to the extent present, is recognized as the amount to which we are most-likely to be entitled, using all information (historical, current and forecasted) that is reasonably available to us, and only to the extent that a significant reversal in the amount of the cumulative revenue recognized is not probable of occurring in a future period. Differences, if any, between estimates of the amount of variable consideration to which we will be entitled and the actual amount of such variable consideration have not been material in the past. Amounts received or receivable from our customers with respect to variable consideration we expect to refund to our customers is recognized as a current liability and classified as accrued sales discounts and rebates. See Note 9. We report any tax assessed by a governmental authority that we collect from our customers that is both imposed on and concurrent with our revenue-producing activities (such as sales, use, value added and excise taxes) on a net basis (meaning we do not recognize these taxes either in our revenues or in our costs and expenses). Frequently, we receive orders for products to be delivered over dates that may extend across reporting periods. We invoice for each delivery upon shipment and recognize revenue for each distinct shipment when all sales recognition criteria for that shipment have been satisfied. As scheduled delivery dates for these orders are within a one-year period, under the optional exemption provided by ASC 606, we do not disclose sales allocated to future shipments of partially completed contracts. ASC 606 requires a disaggregation of our sales into categories that depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. We have determined such disaggregation of our sales is the same as the disclosure of our sales by place of manufacture (point of origin) and to the location of the customer (point of destination). See Note 2. Selling, general and administrative expense; distribution costs

Geographic information

Geographic information	12 Months Ended
	Dec. 31, 2021
Segments Geographical Areas [Abstract]
Geographic Information	Note 2 – Geographic information: Our operations are associated with the production and sale of titanium dioxide pigments (TiO 2 ). TiO 2 is used to impart whiteness, brightness, opacity and durability to a wide variety of products, including paints, plastics, paper, fibers and ceramics. Additionally, TiO 2 is a critical component of everyday applications, such as coatings, plastics and paper, as well as many specialty products such as inks, foods and cosmetics. At December 31, 2020 and 2021, the net assets of non-U.S. subsidiaries included in consolidated net assets approximated $319 million and $338 million, respectively. For geographic information, we attribute net sales to the place of manufacture (point of origin) and to the location of the customer (point of destination); we attribute property and equipment to their physical location. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Net sales - point of origin: ​ ​ ​ ​ ​ ​ ​ ​ ​ United States ​ $ 998.5 ​ $ 978.8 ​ $ 1,052.1 Germany ​ 883.6 ​ 836.0 ​ 971.7 Canada ​ 328.7 ​ 319.5 ​ 371.9 Belgium ​ 270.7 ​ 249.5 ​ 295.7 Norway ​ 192.2 ​ 211.8 ​ 257.2 Eliminations ​ (942.6) ​ (956.8) ​ (1,009.2) Total ​ $ 1,731.1 ​ $ 1,638.8 ​ $ 1,939.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net sales - point of destination: ​ ​ ​ Europe ​ $ 823.5 ​ $ 783.2 ​ $ 945.0 North America ​ 575.6 ​ 569.3 ​ 645.7 Other ​ 332.0 ​ 286.3 ​ 348.7 Total ​ $ 1,731.1 ​ $ 1,638.8 ​ $ 1,939.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Identifiable assets - net property and equipment: ​ ​ Germany ​ $ 228.2 ​ $ 207.3 Belgium ​ 107.3 ​ 106.9 Canada ​ 87.9 ​ 90.5 Norway ​ 86.7 ​ 85.2 Other ​ 14.5 ​ 13.5 Total ​ $ 524.6 ​ $ 503.4 ​

Accounts and Other Receivables,

Accounts and Other Receivables, Net	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Accounts and Other Receivables, Net	Note 3 – Accounts and other receivables, net: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Trade receivables ​ $ 294.8 ​ $ 326.3 Recoverable VAT and other receivables ​ 21.3 ​ 32.4 Refundable income taxes ​ 5.3 ​ 4.0 Allowance for doubtful accounts ​ (1.9) ​ (2.0) Total ​ $ 319.5 ​ $ 360.7 ​

Inventories, Net

Inventories, Net	12 Months Ended
	Dec. 31, 2021
Inventory Disclosure [Abstract]
Inventories, Net	Note 4 – Inventories, net: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Raw materials ​ $ 133.2 ​ $ 76.3 Work in process ​ 36.8 ​ 30.4 Finished products ​ 269.2 ​ 245.6 Supplies ​ 79.8 ​ 80.0 Total ​ $ 519.0 ​ $ 432.3 ​

Investment in TiO2 Manufacturin

Investment in TiO2 Manufacturing Joint Venture	12 Months Ended
	Dec. 31, 2021
Equity Method Investments And Joint Ventures [Abstract]
Investment in TiO2 Manufacturing Joint Venture	Note 5 – Investment in TiO 2 We own a 50% interest in Louisiana Pigment Company, L.P. (LPC). LPC is a manufacturing joint venture whose other 50%-owner is Venator Investments LLC (Venator Investments). Venator Investments is a wholly-owned subsidiary of Venator Group, of which Venator Materials PLC owns 100% and is the ultimate parent. LPC owns and operates a chloride-process TiO 2 We and Venator Investments are both required to purchase one-half 2 2 2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Distributions from LPC ​ $ 40.6 ​ $ 32.7 ​ $ 28.5 Contributions to LPC ​ (49.9) ​ (45.5) ​ (24.7) Net distributions (contributions) ​ $ (9.3) ​ $ (12.8) ​ $ 3.8 ​ Summary balance sheets of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) ASSETS ​ ​ ​ Current assets ​ $ 105.8 ​ $ 111.7 Property and equipment, net ​ 134.1 ​ 142.6 Total assets ​ $ 239.9 ​ $ 254.3 ​ ​ ​ ​ ​ ​ ​ LIABILITIES AND PARTNERS’ EQUITY ​ ​ Other liabilities, primarily current ​ $ 30.6 ​ $ 47.8 Partners’ equity ​ 209.3 ​ 206.5 Total liabilities and partners’ equity ​ $ 239.9 ​ $ 254.3 ​ Summary income statements of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Revenues and other income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Kronos ​ $ 176.2 ​ $ 167.8 ​ $ 188.6 Venator Investments ​ 177.0 ​ 168.3 ​ 189.6 Total revenues and other income ​ 353.2 ​ 336.1 ​ 378.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost and expenses: ​ ​ ​ Cost of sales ​ 352.8 ​ 335.7 ​ 377.8 General and administrative ​ .4 ​ .4 ​ .4 Total costs and expenses ​ 353.2 ​ 336.1 ​ 378.2 Net income ​ $ - ​ $ - ​ $ - ​ We have certain related party transactions with LPC, as more fully described in Note 14.

Marketable Securities

Marketable Securities	12 Months Ended
	Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]
Marketable Securities	Note 6 – 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. Unrealized gains or losses on the securities are recognized in Other income (expense) - Marketable equity securities on our Consolidated Statements of Income. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value ​ ​ ​ ​ ​ ​ ​ ​ measurement ​ Market ​ Cost ​ Unrealized Marketable security level value basis gain (loss) ​ ​ ​ (In millions) December 31, 2020: ​ ​ ​ Valhi common stock 1 ​ $ 2.1 ​ $ 3.2 ​ $ (1.1) NL and CompX common stocks 1 ​ .1 ​ .1 ​ - Total ​ ​ ​ $ 2.2 ​ $ 3.3 ​ $ (1.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021: ​ ​ ​ ​ ​ Valhi common stock 1 ​ $ 4.1 ​ $ 3.2 ​ $ .9 NL and CompX common stocks 1 ​ .1 ​ .1 ​ - Total ​ $ 4.2 ​ $ 3.3 ​ $ .9 ​ At December 31, 2020 and 2021, we held approximately 144,000 shares of Valhi’s common stock. The per share quoted market price of Valhi’s common stock was $15.20 and $28.75, at December 31, 2020 and 2021, respectively. We also held a nominal number of shares of CompX and NL common stocks. The Valhi, CompX and NL common stocks we own are subject to the restrictions on resale pursuant to certain provisions of the Securities and Exchange Commission (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

Leases	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases	Note 7 – Leases: We enter into various operating leases for manufacturing facilities, land and equipment. Our operating leases are included in operating lease right-of-use assets, current operating lease liabilities and noncurrent operating lease liabilities on our Consolidated Balance Sheets. See Note 9. Our principal German operating subsidiary leases the land under its Leverkusen TiO 2 one-third 2 During 2020 2021 At December 31, 2021, maturities of our operating lease liabilities were as follows: ​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2022 ​ $ 4.2 2023 ​ 3.0 2024 ​ 2.1 2025 ​ 1.6 2026 ​ 1.4 2027 and thereafter ​ 17.6 Total remaining lease payments ​ 29.9 Less imputed interest ​ 10.4 Total lease obligations ​ 19.5 Less current obligations ​ 3.7 Long term lease obligations ​ $ 15.8 ​ 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 as a lease modification. Of the $19.5 million total lease obligations at December 31, 2021, $6.9 million relates to our Leverkusen facility land lease. At December 31, 2021, we have no significant lease commitments that have not yet commenced.

Long-Term debt

Long-Term debt	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Note 8 – Long-term debt: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Kronos International, Inc. 3.75% Senior Notes ​ $ 485.7 ​ $ 448.8 Other ​ 1.7 ​ 2.4 Total debt ​ 487.4 ​ 451.2 Less current maturities ​ .7 ​ 1.4 Total long-term debt ​ $ 486.7 ​ $ 449.8 ​ Senior Notes ● bear interest at 3.75% per annum, payable semi-annually on March 15 and September 15 of each year, payments began on March 15, 2018 ; ● have a maturity date of September 15, 2025. 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. 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 non-U.S. 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 December 31, 2021 is stated net of unamortized debt issuance costs of $3.5 million (December 31, 2020 - $4.7 million). Revolving credit facility On April 20, 2021, we entered into a new global $225 million revolving credit facility (Global Revolver) which matures in April 2026. The Global Revolver replaces our previously existing North American and European revolving credit facilities and there were no borrowings on either facility in 2020 and 2021 through their termination concurrent with entering into the Global Revolver. Borrowings under the Global Revolver are available for our general corporate purposes. Available borrowings are based on formula-determined amounts of eligible trade receivables and inventories, as defined in the agreement, less any outstanding letters of credit issued under the Global Revolver. Borrowings by our Canadian, Belgian and German subsidiaries are limited to $25 million, €30 million and €60 million, respectively. Any amounts outstanding under the Global Revolver bear interest, at our option, at the applicable non-base rate (LIBOR, CDOR or EURIBOR, dependent on the currency of the borrowing) plus a margin ranging from 1.5% to 2.0%, or at the applicable base rate, as defined in the agreement, plus a margin ranging from .5% to 2.0%. The Global Revolver is collateralized by, among other things, a first priority lien on the borrowers’ trade receivables and inventories. The facility contains a number of covenants and restrictions customary in lending transactions of this type which, among other things, restrict the borrowers’ ability to incur additional debt, incur liens, pay additional dividends or merge or consolidate with, or sell or transfer all or substantially all of their assets to another entity and, under certain conditions, requires the maintenance of a fixed charge coverage ratio, as defined in the agreement, of at least 1.0 to 1.0. Since inception, we have had no borrowings repayments Aggregate maturities and other ​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2022 ​ $ 1.4 2023 ​ 1.0 2024 ​ - 2025 ​ 452.3 2026 ​ - 2027 and thereafter ​ - Gross maturities ​ 454.7 Less debt issuance costs ​ 3.5 Total ​ $ 451.2 ​ We are in compliance with all of our debt covenants at December 31, 2021.

Accounts Payable and Accrued Li

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2021
Payables And Accruals [Abstract]
Accounts Payable and Accrued Liabilities	Note 9 – Accounts payable and accrued liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Accounts payable ​ $ 111.0 ​ $ 143.6 Accrued sales discounts and rebates ​ 29.1 ​ 28.7 Employee benefits ​ 27.8 ​ 28.9 Operating lease liabilities ​ 6.7 ​ 3.7 Other ​ 41.3 ​ 52.0 Total ​ $ 215.9 ​ $ 256.9 ​

Defined Contribution and Define

Defined Contribution and Defined Benefit Retirement Plans	12 Months Ended
	Dec. 31, 2021
Compensation And Retirement Disclosure [Abstract]
Defined Contribution and Defined Benefit Retirement Plans	Note 10 – Defined contribution and defined benefit retirement plans: Defined contribution plans – Defined benefit pension plans – We expect to contribute the equivalent of approximately $18 million to all of our defined benefit pension plans during 2022. Benefit payments to plan participants out of plan assets are expected to be the equivalent of: ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2022 ​ $ 25.5 2023 ​ 25.4 2024 ​ 27.4 2025 ​ 27.5 2026 ​ 29.1 Next 5 years ​ 167.8 ​ The funded status of our non-U.S. defined benefit pension plans is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Change in projected benefit obligations (PBO): ​ ​ Benefit obligations at beginning of the year ​ $ 738.2 ​ $ 846.7 Service cost ​ 13.3 ​ 14.7 Interest cost ​ 10.0 ​ 8.2 Participant contributions ​ 1.8 ​ 2.0 Actuarial losses (gains) ​ 46.6 ​ (45.4) Change in currency exchange rates ​ 58.6 ​ (55.0) Benefits paid ​ (21.8) ​ (23.1) Benefit obligations at end of the year ​ 846.7 ​ 748.1 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 437.5 ​ 481.8 Actual return on plan assets ​ 18.7 ​ 17.7 Employer contributions ​ 16.0 ​ 18.7 Participant contributions ​ 1.8 ​ 2.0 Change in currency exchange rates ​ 29.6 ​ (27.0) Benefits paid ​ (21.8) ​ (23.1) Fair value of plan assets at end of year ​ 481.8 ​ 470.1 Funded status ​ $ (364.9) ​ $ (278.0) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Noncurrent pension asset ​ $ 4.5 ​ $ 7.6 Noncurrent accrued pension costs ​ (369.4) ​ (285.6) Total ​ $ (364.9) ​ $ (278.0) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss: ​ ​ Actuarial losses ​ $ 304.5 ​ $ 233.3 Prior service cost ​ .8 ​ .4 Total ​ $ 305.3 ​ $ 233.7 ​ ​ ​ ​ ​ ​ ​ Accumulated benefit obligations (ABO) ​ $ 819.7 ​ $ 723.7 ​ The total net underfunded status of our non-U.S. defined benefit pension plans decreased from $364.9 million at December 31, 2020 to $278.0 million at December 31, 2021 due to the change in our PBO during 2021 exceeding the change in plan assets during 2021. The decrease in our PBO in 2021 was primarily attributable to actuarial gains due to the increase in discount rates from year end 2020 and favorable currency fluctuations, primarily from the strengthening of the U.S. dollar relative to the euro. The decrease in our plan assets in 2021 was primarily attributable to unfavorable currency fluctuations, primarily from the strengthening of the U.S. dollar relative to the euro in addition to the net effects of plan asset returns, employer and participant contributions and benefits paid in 2021. The components of our net periodic defined benefit pension cost for our non-U.S. defined benefit pension plans are presented in the table below. The amounts shown below for the amortization of prior service cost and recognized actuarial losses for 2019, 2020 and 2021 were recognized as components of our accumulated other comprehensive loss at December 31, 2018, 2019 and 2020, respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Service cost ​ $ 12.8 ​ $ 13.3 ​ $ 14.7 Interest cost ​ 13.3 ​ 10.0 ​ 8.2 Expected return on plan assets ​ (11.7) ​ (8.7) ​ (11.2) Recognized actuarial losses ​ 12.8 ​ 17.3 ​ 19.4 Amortization of prior service cost ​ .2 ​ .2 ​ .2 Total ​ $ 27.4 ​ $ 32.1 ​ $ 31.3 ​ Information concerning certain of our non-U.S. defined benefit pension plans (for which the ABO exceeds the fair value of plan assets as of the indicated date) is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Plans for which the ABO exceeds plan assets: ​ ​ PBO ​ $ 790.9 ​ $ 695.2 ABO ​ 768.1 ​ 674.4 Fair value of plan assets ​ 421.5 ​ 409.4 ​ The weighted-average rate assumptions used in determining the actuarial present value of benefit obligations for our non-U.S. defined benefit pension plans as of December 31, 2020 and 2021 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ December 31, Rate 2020 2021 Discount rate 1.0% ​ 1.5% Increase in future compensation levels 2.6% ​ 2.6% ​ The weighted-average rate assumptions used in determining the net periodic pension cost for our non-U.S. defined benefit pension plans for 2019, 2020 and 2021 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, Rate 2019 2020 2021 Discount rate 2.1% ​ 1.4% ​ 1.0% Increase in future compensation levels 2.6% ​ 2.6% ​ 2.6% Long-term return on plan assets 2.9% ​ 2.0% ​ 2.4% ​ Variances from actuarially assumed rates will result in increases or decreases in accumulated pension obligations, pension expense and funding requirements in future periods. The funded status of our U.S. defined benefit pension plan is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Change in PBO: ​ ​ Benefit obligations at beginning of the year ​ $ 18.3 ​ $ 19.4 Interest cost ​ .6 ​ .5 Actuarial losses (gains) ​ 1.6 ​ (.6) Settlements ​ ​ - ​ ​ (.5) Benefits paid ​ (1.1) ​ (1.1) Benefit obligations at end of the year ​ 19.4 ​ 17.7 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 14.6 ​ 16.1 Actual return on plan assets ​ 2.0 ​ .5 Employer contributions ​ .6 ​ .4 Benefits paid ​ (1.1) ​ (1.1) Fair value of plan assets at end of year ​ 16.1 ​ 15.9 Funded status ​ $ (3.3) ​ $ (1.8) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Accrued pension costs: ​ ​ Current ​ $ (.1) ​ $ - Noncurrent ​ (3.2) ​ (1.8) Total ​ $ (3.3) ​ $ (1.8) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss - actuarial losses ​ $ 10.9 ​ $ 9.8 ​ ​ ​ ​ ​ ​ ​ ABO ​ $ 19.4 ​ $ 17.7 ​ The components of our net periodic defined benefit pension cost for our U.S. defined benefit pension plan is presented in the table below. The amounts shown below for recognized actuarial losses for 2019, 2020 and 2021 were recognized as components of our accumulated other comprehensive loss at December 31, 2018, 2019 and 2020 respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Interest cost on PBO ​ $ .7 ​ $ .6 ​ $ .5 Expected return on plan assets ​ (.7) ​ (.6) ​ (.6) Recognized actuarial losses ​ .6 ​ .6 ​ .6 Settlement gain ​ - ​ - ​ (.5) Total ​ $ .6 ​ $ .6 ​ $ - ​ The discount rate assumptions used in determining the actuarial present value of the benefit obligation for our U.S. defined benefit pension plan as of December 31, 2020 and 2021 are 2.2% and 2.6%, respectively. The impact of assumed increases in future compensation levels does not have an effect on the benefit obligation as the plan is frozen with regards to compensation. The weighted-average rate assumptions used in determining the net periodic pension cost for our U.S. defined benefit pension plan for 2019, 2020 and 2021 are presented in the table below. The impact of assumed increases in future compensation levels also does not have an effect on the periodic pension cost as the plan is frozen with regards to compensation. ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, Rate 2019 2020 2021 Discount rate 4.1% ​ 3.1% ​ 2.2% Long-term return on plan assets 5.5% ​ 4.5% ​ 4.0% ​ Variances from actuarially assumed rates will result in increases or decreases in accumulated pension obligations, pension expense and funding requirements in future periods. The amounts shown in the tables above for actuarial losses and prior service cost at December 31, 2020 and 2021 have not yet been recognized as components of our periodic defined benefit pension cost as of those dates. These amounts will be recognized as components of our periodic defined benefit cost in future years and are recognized, net of deferred income taxes, in our accumulated other comprehensive loss at December 2020 and 2021. The table below details the changes in our consolidated other comprehensive income (loss) during 2019, 2020 and 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Changes in plan assets and benefit obligations recognized in ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year: ​ ​ ​ Net actuarial (losses) gains ​ $ (48.5) ​ $ (36.8) ​ $ 52.5 Amortization of unrecognized: ​ ​ ​ Net actuarial losses ​ 13.4 ​ 17.9 ​ 20.0 Prior service cost ​ .2 ​ .2 ​ .2 Total ​ $ (34.9) ​ $ (18.7) ​ $ 72.7 ​ In determining the expected long-term rate of return on our U.S. and non-U.S. plan asset assumptions, we consider the long-term asset mix (e.g. equity vs. fixed income) for the assets for each of our plans and the expected long-term rates of return for such asset components. In addition, we receive third-party advice about appropriate long-term rates of return. Such assumed asset mixes are summarized below: ● In Germany, the composition of our plan assets is established to satisfy the requirements of the German insurance commissioner. Our German pension plan assets represent an investment in a large collective investment fund established and maintained by Bayer AG in which several pension plans, including our German pension plans and Bayer’s pension plans, have invested. Our plan assets represent a very nominal portion of the total collective investment fund maintained by Bayer. These plan assets are a Level 3 in the fair value hierarchy because there is not an active market that approximates the value of our investment in the Bayer investment fund. We estimate the fair value of the Bayer plan assets based on periodic reports we receive from the managers of the Bayer fund and using a model we developed with assistance from our third-party actuary that uses estimated asset allocations and correlates such allocation to similar asset mixes in fund indexes quoted on an active market. We periodically evaluate the results of our valuation model against actual returns in the Bayer fund and adjust the model as needed. The Bayer fund periodic reports are subject to audit by the German pension regulator. ● In Canada, we currently have a plan asset target allocation of 20 % to equity securities and 80% to fixed income securities. We expect the long-term rate of return for such investments to approximate the applicable average equity or fixed income index. The Canadian assets are Level 1 inputs because they are traded in active markets. ● In Norway, we currently have a plan asset target allocation of 15% to equity securities, 62% to fixed income securities, 14% to real estate and the remainder primarily to other investments and liquid investments such as money markets. The expected long-term rate of return for such investments is approximately 5% , 2% , 4% and 7% , respectively. The majority of Norwegian plan assets are Level 1 inputs because they are traded in active markets; however approximately 17% of our Norwegian plan assets are invested in real estate and other investments not actively traded and are therefore a Level 3 input. ● In the U.S. we currently have a plan asset target allocation of 33% to equity securities, 59% to fixed income securities, and the remainder is allocated to multi-asset strategies. The expected long-term rate of return for such investments is approximately 9% , 3% and 2% , respectively (before plan administrative expenses). Approximately 94% of our U.S. plan assets are invested in funds that are valued at net asset value (NAV) and, in accordance with ASC 820-10, not subject to classification in the fair value hierarchy. ● We also have plan assets in Belgium and the United Kingdom. The Belgium plan assets are invested in certain individualized fixed income insurance contracts for the benefit of each plan participant as required by the local regulators and are therefore a Level 3 input. The United Kingdom plan assets are invested primarily in insurance contracts that are a Level 3 input. We regularly review our actual asset allocation for each plan and will periodically rebalance the investments in each plan to more accurately reflect the targeted allocation and/or maximize the overall long-term return when considered appropriate. The composition of our pension plan assets by asset category and fair value level at December 31, 2020 and 2021 is shown in the tables below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at December 31, 2020 ​ ​ ​ ​ ​ Quoted ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ prices ​ other ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ in active ​ observable ​ unobservable ​ Assets ​ ​ ​ ​ ​ markets ​ inputs ​ inputs ​ measured at ​ Total (Level 1) (Level 2) (Level 3) NAV ​ (In millions) Germany ​ $ 292.5 ​ $ - ​ $ - ​ $ 292.5 ​ $ - Canada: ​ ​ ​ ​ ​ Local currency equities ​ .2 ​ .2 ​ - ​ - ​ - Non local currency equities ​ 26.6 ​ 26.6 ​ - ​ - ​ - Local currency fixed income ​ 87.3 ​ 87.3 ​ - ​ - ​ - Cash and other ​ .9 ​ .9 ​ - ​ - ​ - Norway: ​ ​ ​ ​ ​ Local currency equities ​ 3.2 ​ 3.2 ​ - ​ - ​ - Non local currency equities ​ 6.3 ​ 6.3 ​ - ​ - ​ - Local currency fixed income ​ 26.4 ​ 16.3 ​ 10.1 ​ - ​ - Non local currency fixed income ​ 7.7 ​ 7.7 ​ - ​ - ​ - Real estate ​ 7.1 ​ - ​ - ​ 7.1 ​ - Cash and other ​ 5.5 ​ 4.8 ​ - ​ .7 ​ - U.S.: ​ ​ ​ ​ ​ Equities ​ 6.3 ​ .9 ​ - ​ .2 ​ 5.2 Fixed income ​ 8.1 ​ 8.1 ​ - ​ - ​ - Cash and other ​ 1.7 ​ 1.3 ​ - ​ - ​ .4 Other ​ 18.1 ​ 4.3 ​ - ​ 13.8 ​ - Total ​ $ 497.9 ​ $ 167.9 ​ $ 10.1 ​ $ 314.3 ​ $ 5.6 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at December 31, 2021 ​ ​ ​ ​ ​ Quoted ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ prices ​ other ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ in active ​ observable ​ unobservable ​ Assets ​ ​ ​ ​ ​ markets ​ inputs ​ inputs ​ measured at ​ Total (Level 1) (Level 2) (Level 3) NAV ​ ​ (In millions) Germany ​ $ 282.9 ​ $ - ​ $ - ​ $ 282.9 ​ $ - Canada: ​ ​ ​ ​ ​ Local currency equities ​ .2 ​ .2 ​ - ​ - ​ - Non local currency equities ​ 21.9 ​ 21.9 ​ - ​ - ​ - Local currency fixed income ​ 89.3 ​ 89.3 ​ - ​ - ​ - Cash and other ​ .8 ​ .8 ​ - ​ - ​ - Norway: ​ ​ ​ ​ ​ Local currency equities ​ 3.1 ​ 3.1 ​ - ​ - ​ - Non local currency equities ​ 5.9 ​ 5.9 ​ - ​ - ​ - Local currency fixed income ​ 25.1 ​ 15.9 ​ 9.2 ​ - ​ - Non local currency fixed income ​ 6.7 ​ 6.7 ​ - ​ - ​ - Real estate ​ 9.1 ​ - ​ - ​ 9.1 ​ - Cash and other ​ 7.0 ​ 6.4 ​ - ​ .6 ​ - U.S.: ​ ​ ​ ​ ​ Equities ​ 5.6 ​ .4 ​ - ​ - ​ 5.2 Fixed income ​ 9.3 ​ - ​ - ​ - ​ 9.3 Cash and other ​ 1.0 ​ .6 ​ - ​ - ​ .4 Other ​ 18.1 ​ .4 ​ - ​ 17.7 ​ - Total ​ $ 486.0 ​ $ 151.6 ​ $ 9.2 ​ $ 310.3 ​ $ 14.9 ​ A rollforward of the change in fair value of Level 3 assets follows. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Fair value at beginning of year ​ $ 283.1 ​ $ 314.3 Gain on assets held at end of year ​ 4.2 ​ 15.6 Gain on assets sold during the year ​ - ​ .4 Assets purchased ​ 14.4 ​ 16.2 Assets sold ​ (14.1) ​ (14.8) Transfers in ​ ​ - ​ ​ 3.5 Currency exchange rate fluctuations ​ 26.7 ​ (24.9) Fair value at end of year ​ $ 314.3 ​ $ 310.3 ​

Other Noncurrent Liabilities

Other Noncurrent Liabilities	12 Months Ended
	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Other Noncurrent Liabilities	Note 11 – Other noncurrent liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Accrued postretirement benefits ​ $ 8.7 ​ $ 8.4 Employee benefits ​ 6.2 ​ 6.1 Other ​ 11.8 ​ 13.5 Total ​ $ 26.7 ​ $ 28.0 ​ ​

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Note 12 – Income taxes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Pre-tax income: ​ ​ ​ U.S. ​ $ 37.9 ​ $ 20.9 ​ $ 25.5 Non-U.S. ​ 83.2 ​ 59.1 ​ 127.9 Total ​ $ 121.1 ​ $ 80.0 ​ $ 153.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expected tax expense, at U.S. federal statutory income tax rate of 21% ​ $ 25.4 ​ $ 16.8 ​ $ 32.2 Non-U.S. tax rates ​ 5.4 ​ .7 ​ 4.6 Incremental net tax benefit on earnings and losses of U.S. ​ (4.3) ​ (5.5) ​ (3.9) Valuation allowance, net ​ .7 ​ .8 ​ 3.1 Global intangible low-tax income, net ​ 2.4 ​ 2.7 ​ 2.8 Tax rate changes ​ 5.5 ​ (.3) ​ - Assessment (refund) of prior tax payments, net ​ (2.1) ​ (.1) ​ .1 Adjustment to the reserve for uncertain tax positions, net ​ .7 ​ .1 ​ - Nondeductible expenses ​ 1.4 ​ .9 ​ 1.0 Other, net ​ (1.1) ​ - ​ .6 Income tax expense ​ $ 34.0 ​ $ 16.1 ​ $ 40.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Components of income tax expense: ​ ​ ​ Current payable: ​ ​ ​ U.S. federal and state ​ $ 5.5 ​ $ 4.8 ​ $ 4.6 Non-U.S. ​ 21.9 ​ 14.9 ​ 21.6 ​ ​ 27.4 ​ 19.7 ​ 26.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred income taxes (benefit): ​ ​ ​ U.S. federal and state ​ .8 ​ (2.6) ​ 3.3 Non-U.S. ​ 5.8 ​ (1.0) ​ 11.0 ​ ​ 6.6 ​ (3.6) ​ 14.3 Income tax expense ​ $ 34.0 ​ $ 16.1 ​ $ 40.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Comprehensive provision for income taxes allocable to: ​ ​ ​ Net income ​ $ 34.0 ​ $ 16.1 ​ $ 40.5 Other comprehensive income (loss): ​ ​ ​ Pension plans ​ (13.7) ​ (6.0) ​ 24.0 OPEB plans ​ (.2) ​ (.2) ​ - Total ​ $ 20.1 ​ $ 9.9 ​ $ 64.5 ​ The amount shown in the preceding 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. The amount shown on such table for incremental net tax benefit on earnings and losses of U.S. and non-U.S. companies includes, as applicable, (i) deferred income taxes (or deferred income tax benefits) associated with the current-year earnings of all of our non-U.S. subsidiaries and (ii) 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. The components of our net deferred income taxes at December 31, 2020 and 2021 are summarized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2020 ​ 2021 ​ Assets Liabilities Assets Liabilities ​ ​ (In millions) Tax effect of temporary differences related to: ​ ​ ​ ​ Inventories ​ $ 1.7 ​ $ - ​ $ - ​ $ (2.9) Property and equipment ​ - ​ (58.4) ​ - ​ (62.5) Lease assets (liabilities) ​ 6.4 ​ (6.5) ​ 5.0 ​ (5.1) Accrued OPEB costs ​ 2.4 ​ - ​ 2.3 ​ - Accrued pension costs ​ 100.0 ​ - ​ 73.6 ​ - Other accrued liabilities and deductible differences ​ 11.7 ​ - ​ 12.1 ​ - Other taxable differences ​ - ​ (1.4) ​ - ​ (3.3) Tax on unremitted earnings of non-U.S. subsidiaries ​ - ​ (12.0) ​ - ​ (11.2) Tax loss and tax credit carryforwards ​ 86.9 ​ - ​ 78.1 ​ - Valuation allowance ​ (4.4) ​ - ​ (7.4) ​ - Adjusted gross deferred tax assets (liabilities) ​ 204.7 ​ (78.3) ​ 163.7 ​ (85.0) Netting by tax jurisdiction ​ (53.7) ​ 53.7 ​ (56.9) ​ 56.9 Net noncurrent deferred tax asset (liability) ​ $ 151.0 ​ $ (24.6) ​ $ 106.8 ​ $ (28.1) ​ We have substantial net operating loss (NOL) carryforwards in Germany (the equivalent of $451 million for German corporate tax purposes at December 31, 2021) and in Belgium (the equivalent of $19 million for Belgian corporate tax purposes at December 31, 2021). At December 31, 2021, we have concluded that no deferred income tax asset valuation allowance is required to be recognized with respect to such carryforwards, principally because (i) such carryforwards have an indefinite carryforward period, (ii) we have utilized a portion of such carryforwards during the most recent three-year period and (iii) we currently expect to utilize the remainder of such carryforwards over the long term. However, prior to the complete utilization of such carryforwards, if we were to generate additional losses in our German or Belgian operations for an extended period of time, or if applicable law were to change such that the carryforward period was no longer indefinite, it is possible that we might conclude the benefit of such carryforwards would no longer meet the more-likely-than-not recognition criteria, at which point we would be required to recognize a valuation allowance against some or all of the then-remaining tax benefit associated with the carryforwards. Prior to the enactment of the 2017 Tax Act, the undistributed earnings of our European subsidiaries were deemed to be permanently reinvested (we had not made a similar determination with respect to the undistributed earnings of our Canadian subsidiary). Pursuant to the one-time repatriation tax (Transition Tax) provisions of the 2017 Tax Act which imposed a one-time repatriation tax on post-1986 undistributed earnings, we recognized current income tax expense of $74.5 million and elected to pay such tax over an eight year period beginning in 2018. At December 31, 2021, the balance of our unpaid Transition Tax is $50.6 million, which will be paid in annual installments over the remainder of the eight-year In the fourth quarter of 2019, we recognized an income tax benefit of $3.0 million primarily related to the favorable settlement of a prior year tax matter in Germany, with $1.5 million recognized as a current cash tax benefit and $1.5 million recognized as a non-cash deferred income tax benefit related to an increase to our German net operating loss carryforward. In addition, we recognized a non-cash deferred income tax expense of $5.5 million primarily related to the revaluation of our net deferred income tax asset in Germany resulting from a decrease in the German trade tax rate. Tax authorities are examining certain of our U.S. and non-U.S. tax returns and 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 tax matters, if any, will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain. 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. On March 27, 2020, the “Coronavirus Aid, Relief and Economic Security (CARES) Act” was signed into law in response to the COVID-19 pandemic. The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer side social security payments, modifications to the limitation of business interest for tax years beginning in 2019 and 2020 and technical corrections to tax depreciation methods for qualified improvement property. The modification to the business interest provisions increased the business interest limitation from 30% of adjusted taxable income to 50% of adjusted taxable income which increased our allowable interest expense deduction for 2019 and 2020. Consequently, in the first quarter of 2020 we recognized a cash tax benefit of $.5 million related to the reversal of the valuation allowance recognized in 2019 for the portion of the disallowed interest expense we did not expect to fully utilize at December 31, 2019 and we considered such modifications in our 2020 provision for income taxes. With the expiration of these CARES Act provisions at the end of 2020, we recognized an increase in disallowed interest expense and an increase in the valuation allowance of $2.8 million for the portion of the carryforward we believe does not meet the more-likely-than-not measurement criteria in 2021. We accrue interest and penalties on our uncertain tax positions as a component of our provision for income taxes. The amount of interest and penalties we accrued during 2019, 2020 and 2021 was not material. The following table shows the changes in the amount of our uncertain tax positions (exclusive of the effect of interest and penalties discussed above) during 2019, 2020 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Changes in unrecognized tax benefits: ​ ​ ​ Unrecognized tax benefits at beginning of year ​ $ 4.1 ​ $ 3.9 ​ $ 4.1 Net increase (decrease): ​ ​ ​ Tax positions taken in prior periods ​ (.8) ​ (.3) ​ - Tax positions taken in current period ​ .7 ​ .6 ​ .6 Lapse due to applicable statute of limitations ​ - ​ (.5) ​ (.7) Change in currency exchange rates ​ (.1) ​ .4 ​ (.2) Unrecognized tax benefits at end of year ​ $ 3.9 ​ $ 4.1 ​ $ 3.8 ​ At December 31, 2021, all of our uncertain tax benefits are classified as a component of our noncurrent deferred tax asset. If our uncertain tax position at December 31, 2021 was recognized, a benefit of $3.8 million would affect our effective income tax rate. We currently estimate that our unrecognized tax benefits will decrease by approximately $1.1 million during the next twelve months due to the expiration of certain statutes of limitations. We and Contran file income tax returns in U.S. federal and various state and local jurisdictions. We also file income tax returns in various non-U.S. jurisdictions, principally in Germany, Canada, Belgium and Norway. Our U.S. income tax returns prior to 2018 are generally considered closed to examination by applicable tax authorities. Our non-U.S. income tax returns are generally considered closed to examination for years prior to 2017 for Germany, 2018 for Belgium, 2016 for Canada and 2016 for Norway.

Stockholders' equity

Stockholders' equity	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Stockholders' equity	Note 13 – Stockholders’ equity: Long-term incentive compensation plan Stock repurchase program 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. In 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 all such shares. In 2020, we acquired 122,489 shares of our common stock in market transactions for an aggregate purchase price of $1.0 million and subsequently cancelled all such shares. In 2021, we acquired 14,409 shares of common stock in market transactions for an aggregate purchase price of $.2 million which are accounted for as treasury stock at December 31, 2021. At December 31, 2021, 1,549,110 shares are available for repurchase under this stock repurchase program. Accumulated other comprehensive loss – ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Accumulated other comprehensive loss, net of tax: ​ ​ ​ Currency translation: ​ ​ ​ Balance at beginning of period ​ $ (245.0) ​ $ (246.8) ​ $ (233.4) Other comprehensive income (loss) ​ (1.8) ​ 13.4 ​ (7.0) Balance at end of period ​ $ (246.8) ​ $ (233.4) ​ $ (240.4) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Defined benefit pension plans: ​ ​ ​ Balance at beginning of period ​ $ (180.0) ​ $ (202.2) ​ $ (214.5) Other comprehensive income - ​ ​ ​ amortization of prior service cost and net losses included in ​ 9.5 ​ 13.4 ​ 14.9 Net actuarial gain (loss) arising during year ​ (31.7) ​ (25.7) ​ 36.3 Balance at end of period ​ $ (202.2) ​ $ (214.5) ​ $ (163.3) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPEB plans: ​ ​ ​ Balance at beginning of period ​ $ .7 ​ $ .2 ​ $ (.3) Other comprehensive loss - ​ ​ ​ amortization of prior service credit and net losses included in ​ (.3) ​ (.2) ​ (.3) Net actuarial gain (loss) arising during year ​ (.2) ​ (.3) ​ .2 Balance at end of period ​ $ .2 ​ $ (.3) ​ $ (.4) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total accumulated other comprehensive loss: ​ ​ ​ Balance at beginning of period ​ $ (424.3) ​ $ (448.8) ​ $ (448.2) Other comprehensive income (loss) ​ (24.5) ​ .6 ​ 44.1 Balance at end of period ​ $ (448.8) ​ $ (448.2) ​ $ (404.1) ​ See Note 6 for further discussion on our marketable securities, Note 10 for amounts related to our defined benefit pension plans and Note 11 for our OPEB plans.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Note 14 – Related party transactions: We may be deemed to be controlled by Ms. Simmons and the Family Trust. See Note 1. Corporations that may be deemed to be controlled by or affiliated with such individuals sometimes engage in (a) intercorporate transactions such as guarantees, management and expense sharing arrangements, shared fee arrangements, joint ventures, partnerships, loans, options, advances of funds on open account, and sales, leases and exchanges of assets, including securities issued by both related and unrelated parties and (b) common investment and acquisition strategies, business combinations, reorganizations, recapitalizations, securities repurchases, and purchases and sales (and other acquisitions and dispositions) of subsidiaries, divisions or other business units, which transactions have involved both related and unrelated parties and have included transactions which resulted in the acquisition by one related party of a publicly-held noncontrolling interest in another related party. While no transactions of the type described above are planned or proposed with respect to us other than as set forth in these financial statements, we continuously consider, review and evaluate, and understand that Contran and related entities consider, review and evaluate such transactions. Depending upon the business, tax and other objectives then relevant, it is possible that we might be a party to one or more such transactions in the future. Receivables from and payables to affiliates are summarized in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Current receivables from affiliates: ​ ​ LPC ​ $ - ​ $ 15.8 Other ​ 3.5 ​ 2.6 ​ ​ $ 3.5 ​ $ 18.4 ​ ​ ​ ​ ​ ​ ​ Current payables to affiliates: ​ ​ LPC ​ $ 19.3 ​ $ 17.3 Income taxes payable to Valhi ​ 8.6 ​ .9 ​ ​ $ 27.9 ​ $ 18.2 ​ ​ ​ ​ ​ ​ ​ Noncurrent payable to affiliate - ​ ​ Income taxes payable to Valhi (See Note 12) ​ $ 50.6 ​ $ 44.7 ​ Amounts payable to LPC are generally for the purchase of TiO 2 2 2 From time to time, we may have loans and advances outstanding between us and various related parties pursuant to term and demand notes. We generally enter into these loans and advances for cash management purposes. When we loan funds to related parties, we are generally able to earn a higher rate of return on the loan than we would earn if we invested the funds in other instruments, and when we borrow from related parties, we are generally able to pay a lower rate of interest than we would pay if we had incurred third-party indebtedness. While certain of these loans to affiliates may be of a lesser credit quality than cash equivalent instruments otherwise available to us, we believe we have considered the credit risks in the terms of the applicable loans. In this regard, prior to 2019 we entered into an unsecured revolving demand promissory note with Valhi under which as amended, we have agreed to loan Valhi up to $30 million. Our loan to Valhi bears interest at prime plus 1.00%, payable quarterly, with all principal due on demand, but in any event no earlier than December 31, 2023. Loans made to Valhi at any time are at our discretion. At December 31, 2020 and December 31, 2021, we had no outstanding loans to Valhi under this promissory note. Interest income (including unused commitment fees) on our loan to Valhi was $.5 million in 2019, $.3 million in 2020 and $.2 million in 2021. Under the terms of various intercorporate services agreements (ISAs) entered into between us and various related parties, including Contran, employees of one company will provide certain management, tax planning, financial and administrative services to the other company on a fee basis. Such fees are based upon the compensation of individual Contran employees providing services for us and/or estimates of the time devoted to our affairs by such persons. Because of the number of companies affiliated with Contran, we believe we benefit from cost savings and economies of scale gained by not having certain management, financial and administrative staffs duplicated at each entity, thus allowing certain individuals to provide services to multiple companies but only be compensated by one entity. We negotiate fees annually and agreements renew quarterly. The net ISA fee charged to us by Contran is included in selling, general and administrative expense and corporate expense and was $22.8 million in 2019, $23.3 million in 2020 and $24.0 million in 2021. Contran and certain of its subsidiaries and affiliates, including us, purchase certain of their insurance policies as a group, with the costs of the jointly-owned policies being apportioned among the participating companies. Tall Pines Insurance Company, a subsidiary of Valhi, underwrites certain insurance policies for Contran and certain of its subsidiaries and affiliates, including us. Tall Pines purchases reinsurance from third-party insurance carriers with an A.M. Best Company rating of generally at least A-(excellent) for substantially all of the risks it underwrites. EWI RE, Inc., a subsidiary of Valhi, brokered certain of our insurance policies, provided claims and risk management services and, where appropriate, engaged certain third-party risk management consultants prior to NL’s sale of EWI’s insurance and risk management business to a third party in November 2019. Consistent with insurance industry practices, Tall Pines receives commissions from reinsurance underwriters and/or assesses fees for certain of the policies that it underwrites, and prior to November 2019 EWI received commissions from insurance and reinsurance underwriters for the policies that it brokered. The aggregate amount we paid under the group insurance program in 2019 was $12.5 million through the date of the sale. This amount principally represents insurance premiums paid to Tall Pines or EWI, including amounts paid to EWI that EWI then remitted, net of brokerage commissions, to insurers. Following the sale of EWI’s insurance and risk management business, Contran engaged the third-party insurance broker that purchased the business to provide many of the services previously provided by EWI, and we continue to utilize Tall Pines to underwrite certain insurance risks. We and our joint venture paid $19.1 million and $23.2 million in 2020 and 2021, respectively, under the group insurance program, which amounts principally represent insurance premiums, including $14.8 million and $18.6 million in 2020 and 2021, respectively, for policies written by Tall Pines. Amounts paid under the group insurance program also include payments to insurers or reinsurers (which prior to the sale were made through EWI) for the reimbursement of claims within our applicable deductible or retention ranges that such insurers and reinsurers paid to third parties on our behalf, as well as amounts for claims and risk management services and various other third-party fees and expenses incurred by the program. We expect these relationships will continue in 2022. With respect to certain of such jointly-owned policies, it is possible that unusually large losses incurred by one or more insureds during a given policy period could leave the other participating companies without adequate coverage under that policy for the balance of the policy period. As a result, and in the event that the available coverage under a particular policy would become exhausted by one or more claims, Contran and certain of its subsidiaries and affiliates, including us, have entered into a loss sharing agreement under which any uninsured loss arising because the available coverage had been exhausted by one or more claims will be shared ratably by those entities that had submitted claims under the relevant policy. We believe the benefits, in the form of reduced premiums and broader coverage associated with the group coverage for such policies, justifies the risk associated with the potential for any uninsured loss. Contran and certain of its subsidiaries, including us, participate in a combined information technology data recovery program that Contran provides from a data recovery center that it established. Pursuant to the program, Contran and certain of its subsidiaries, including us, as a group share information technology data recovery services. The program apportions its costs among the participating companies. We paid Contran $.2 million in 2019 and $.3 million in both 2020 and 2021 for such services. Under the terms of a sublease agreement between Contran and us, we lease certain office space from Contran. We paid Contran $.1 million in 2019 and $.4 million in both 2020 and 2021 for such rent and related ancillary services. We expect that these relationships with Contran will continue in 2022.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 15 – Commitments and contingencies: Environmental matters manufacturing operations, as well as our environmental, social and governance strategy. From time to time, we may be subject to environmental regulatory enforcement under U.S. and non-U.S. statutes, the resolution of which typically involves the establishment of compliance programs. It is possible that future developments, such as stricter requirements of environmental laws and enforcement policies thereunder, could adversely affect our production, handling, use, storage, transportation, sale or disposal of such substances. We believe all our manufacturing facilities are in substantial compliance with applicable environmental laws. Litigation matters Concentrations of credit risk 2 2 2 2 2 The table below shows the approximate percentage of our TiO 2 ​ ​ ​ ​ ​ ​ ​ ​ 2019 ​ 2020 ​ 2021 Europe 46% ​ 46% ​ 46% North America 34% ​ 36% ​ 37% ​ Long-term contracts 2 Income taxes

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Financial Instruments	Note 16 – Financial instruments: See Note 6 for information on how we determine fair value of our marketable securities. The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2020 and 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2021 ​ ​ Carrying ​ Fair ​ Carrying ​ Fair ​ ​ amount ​ value ​ amount ​ value ​ ​ (In millions) Cash, cash equivalents and restricted cash ​ $ 362.0 ​ $ 362.0 ​ $ 412.6 ​ $ 412.6 Long-term debt - Fixed rate Senior Notes ​ 485.7 ​ 499.9 ​ 448.8 ​ 460.2 ​ At December 31, 2021, the estimated market price of our Senior Notes was €1,018 per €1,000 principal amount. The fair value of our Senior Notes was 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. Due to their near-term maturities, the carrying amounts of accounts receivable and accounts payable are considered equivalent to fair value. See Notes 3 and 9.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Organization and Basis of Presentation	Organization and basis of presentation – Unless otherwise indicated, references in this report to “we,” “us” or “our” refer to Kronos Worldwide, Inc. and its subsidiaries, taken as a whole.
Management's Estimates	Management’s estimates –
Principles of Consolidation	Principles of consolidation –
Translation of Currencies	Translation of currencies –
Cash and Cash Equivalents	Cash and cash equivalents –
Restricted Cash	Restricted cash –
Marketable Securities and Securities Transactions	Marketable securities and securities transactions – Fair Value Measurements and Disclosures ● Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; ● Level 2 – Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the assets or liability; and ● Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable. We classify all of our marketable securities as available-for-sale. Unrealized gains or losses on the securities are recognized in Other income (expense) - Marketable equity securities on our Consolidated Statements of Income. We base realized gains and losses upon the specific identification of the securities sold. See Notes 6 and 10.
Accounts Receivable	Accounts receivable –
Inventories and Cost of Sales	Inventories and cost of sales –
Investment in TiO2 Manufacturing Joint Venture	Investment in TiO 2 manufacturing joint venture –
Leases	Leases – 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. Operating leases are included in operating lease right-of-use assets, current operating lease liabilities and noncurrent operating lease liabilities on our Consolidated Balance Sheets. See Note 9. As permitted by ASC Topic 842, Leases 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. 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 facility 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. 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. Our lease agreements do not contain any residual value guarantees.
Property and Equipment and Depreciation	Property and equipment and depreciation – ​ ​ ​ ​ Asset Useful lives Buildings and improvements ​ 10 to 40 years Machinery and equipment 3 to 20 years Mine development costs units-of-production ​ We use accelerated depreciation methods for income tax purposes, as permitted. Upon the sale or retirement of an asset, we remove the related cost and accumulated depreciation from the accounts and recognize any gain or loss in income currently. We expense costs incurred for maintenance, repairs and minor renewals (including planned major maintenance) while we capitalize expenditures for major improvements. We have a governmental concession with an unlimited term to operate our ilmenite mines in Norway. Mining properties consist of buildings and equipment used in our Norwegian ilmenite mining operations. While we own the land and ilmenite reserves associated with the mining operations, such land and reserves were acquired for nominal value and we have no material asset recognized for the land and reserves related to our mining operations. We perform impairment tests when events or changes in circumstances indicate the carrying value may not be recoverable. We consider all relevant factors. We perform the impairment test by comparing the estimated future undiscounted cash flows (exclusive of interest expense) associated with the asset to the asset’s net carrying value to determine if a write-down to fair value is required.
Long-term Debt	Long-term debt –
Employee Benefit Plans	Employee benefit plans – (OPEB), consisting of health care and life insurance benefits, to certain U.S. and Canadian retired employees, which are not material. See Note 11.
Income Taxes	Income taxes – We recognize deferred income tax assets and liabilities for the expected future tax consequences of temporary differences between the income tax and financial reporting carrying amounts of assets and liabilities, including investments in our subsidiaries and affiliates who are not members of the Contran Tax Group and undistributed earnings of non-U.S. subsidiaries which are not deemed to be permanently reinvested. At December 31, 2021, we continue to assert indefinite reinvestment as it relates to our outside basis difference attributable to our investments in our non-U.S. subsidiaries, other than post-1986 undistributed earnings of our European subsidiaries and all undistributed earnings of our Canadian subsidiary, which are not subject to permanent reinvestment plans. It is not practical for us to determine the amount of the unrecognized deferred income tax liability related to our investments in our non-U.S. subsidiaries which are permanently reinvested due to the complexities associated with our organizational structure, changes in the Tax Cuts and Jobs Act (2017 Tax Act), and the U.S. taxation of such investments in the states in which we operate. Deferred income tax assets and liabilities for each tax-paying jurisdiction in which we operate are netted and presented as either a noncurrent deferred income tax asset or liability, as applicable. We periodically evaluate our deferred tax assets in the various taxing jurisdictions in which we operate and adjust any related valuation allowance based on the estimate of the amount of such deferred tax assets that we believe does not meet the more-likely-than-not recognition criteria. The 2017 Tax Act imposed a tax on global intangible low-tax income (GILTI). We record GILTI tax as a current-period expense when incurred under the period cost method. While our future global operations depend on a number of different factors, we do expect to have future U.S. inclusions in taxable income related to GILTI.
Income Tax Uncertainties	We account for the tax effects of a change in tax law as a component of the income tax provision related to continuing operations in the period of enactment, including the tax effects of any deferred income taxes originally established through a financial statement component other than continuing operations (i.e. other comprehensive income). Changes in applicable income tax rates over time as a result of changes in tax law, or times in which a deferred income tax asset valuation allowance is initially recognized in one year and subsequently reversed in a later year, can give rise to “stranded” tax effects in accumulated other comprehensive income in which the net accumulated income tax (benefit) remaining in accumulated other comprehensive income does not correspond to the then-applicable income tax rate applied to the pre-tax amount which resides in accumulated other comprehensive income. As permitted by GAAP, our accounting policy is to remove any such stranded tax effect remaining in accumulated other comprehensive income by recognizing an offset to our provision for income taxes related to continuing operations, only at the time when there is no remaining pre-tax amount in accumulated other comprehensive income. For accumulated other comprehensive income related to currency translation, this would occur only upon the sale or complete liquidation of one of our non-U.S. subsidiaries. For defined pension benefit plans and OPEB plans, this would occur whenever one of our subsidiaries which previously sponsored a defined benefit pension or OPEB plan had terminated such a plan and had no future obligation or plan asset associated with such a plan. We record a reserve for uncertain tax positions for tax positions where we believe that it is more-likely-than-not our position will not prevail with the applicable tax authorities. The amount of the benefit associated with our uncertain tax positions that we recognize is limited to the largest amount for which we believe the likelihood of realization is greater than 50%. We accrue penalties and interest on the difference between tax positions taken on our tax returns and the amount of benefit recognized for financial reporting purposes. We classify our reserves for uncertain tax positions in a separate current or noncurrent liability, depending on the nature of the tax position. See Note 12.
Net Sales	Net sales – Revenues from Contracts with Customers, (ASC 606) Revenue is recorded in an amount that reflects the net consideration we expect to receive in exchange for our products. Prices for our products are based on terms specified in published list prices and purchase orders, which generally do not include financing components, noncash consideration or consideration paid to our customers. As our standard payment terms are less than one year, we have elected the practical expedient under ASC 606 and have not assessed whether a contract has a significant financing component. We state sales net of price, early payment, and distributor discounts and volume rebates (collectively, variable consideration). Variable consideration, to the extent present, is recognized as the amount to which we are most-likely to be entitled, using all information (historical, current and forecasted) that is reasonably available to us, and only to the extent that a significant reversal in the amount of the cumulative revenue recognized is not probable of occurring in a future period. Differences, if any, between estimates of the amount of variable consideration to which we will be entitled and the actual amount of such variable consideration have not been material in the past. Amounts received or receivable from our customers with respect to variable consideration we expect to refund to our customers is recognized as a current liability and classified as accrued sales discounts and rebates. See Note 9. We report any tax assessed by a governmental authority that we collect from our customers that is both imposed on and concurrent with our revenue-producing activities (such as sales, use, value added and excise taxes) on a net basis (meaning we do not recognize these taxes either in our revenues or in our costs and expenses). Frequently, we receive orders for products to be delivered over dates that may extend across reporting periods. We invoice for each delivery upon shipment and recognize revenue for each distinct shipment when all sales recognition criteria for that shipment have been satisfied. As scheduled delivery dates for these orders are within a one-year period, under the optional exemption provided by ASC 606, we do not disclose sales allocated to future shipments of partially completed contracts. ASC 606 requires a disaggregation of our sales into categories that depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. We have determined such disaggregation of our sales is the same as the disclosure of our sales by place of manufacture (point of origin) and to the location of the customer (point of destination). See Note 2.
Selling, General and Administrative Expense; Distribution Costs	Selling, general and administrative expense; distribution costs
Shipping and Handling Costs	We include distribution (shipping and handling) costs in selling, general and administrative expense and these costs were $111 million in 2019, $112 million in 2020 and $132 million in 2021.
Research and Development	We expense research and development costs as incurred, and these costs were $17 million in 2019, $16 million in 2020 and $17 million in 2021.
Advertising Costs	We expense advertising costs as incurred and these costs were not material in any year presented.
Concentrations of credit risk	Concentrations of credit risk 2 2 2 2 2 The table below shows the approximate percentage of our TiO 2 ​ ​ ​ ​ ​ ​ ​ ​ 2019 ​ 2020 ​ 2021 Europe 46% ​ 46% ​ 46% North America 34% ​ 36% ​ 37%

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Estimated Useful Life of Assets	​ ​ ​ ​ Asset Useful lives Buildings and improvements ​ 10 to 40 years Machinery and equipment 3 to 20 years Mine development costs units-of-production

Geographic Information (Tables)

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2021
Segments Geographical Areas [Abstract]
Net Sales and Property and Equipment by Geographical Information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Net sales - point of origin: ​ ​ ​ ​ ​ ​ ​ ​ ​ United States ​ $ 998.5 ​ $ 978.8 ​ $ 1,052.1 Germany ​ 883.6 ​ 836.0 ​ 971.7 Canada ​ 328.7 ​ 319.5 ​ 371.9 Belgium ​ 270.7 ​ 249.5 ​ 295.7 Norway ​ 192.2 ​ 211.8 ​ 257.2 Eliminations ​ (942.6) ​ (956.8) ​ (1,009.2) Total ​ $ 1,731.1 ​ $ 1,638.8 ​ $ 1,939.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net sales - point of destination: ​ ​ ​ Europe ​ $ 823.5 ​ $ 783.2 ​ $ 945.0 North America ​ 575.6 ​ 569.3 ​ 645.7 Other ​ 332.0 ​ 286.3 ​ 348.7 Total ​ $ 1,731.1 ​ $ 1,638.8 ​ $ 1,939.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Identifiable assets - net property and equipment: ​ ​ Germany ​ $ 228.2 ​ $ 207.3 Belgium ​ 107.3 ​ 106.9 Canada ​ 87.9 ​ 90.5 Norway ​ 86.7 ​ 85.2 Other ​ 14.5 ​ 13.5 Total ​ $ 524.6 ​ $ 503.4

Accounts and Other Receivable_2

Accounts and Other Receivables, Net (Tables)	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Accounts and Other Receivables, Net	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Trade receivables ​ $ 294.8 ​ $ 326.3 Recoverable VAT and other receivables ​ 21.3 ​ 32.4 Refundable income taxes ​ 5.3 ​ 4.0 Allowance for doubtful accounts ​ (1.9) ​ (2.0) Total ​ $ 319.5 ​ $ 360.7

Inventories, Net (Tables)

Inventories, Net (Tables)	12 Months Ended
	Dec. 31, 2021
Inventory Disclosure [Abstract]
Schedule of Inventories, Net	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Raw materials ​ $ 133.2 ​ $ 76.3 Work in process ​ 36.8 ​ 30.4 Finished products ​ 269.2 ​ 245.6 Supplies ​ 79.8 ​ 80.0 Total ​ $ 519.0 ​ $ 432.3

Investment in TiO2 Manufactur_2

Investment in TiO2 Manufacturing Joint Venture (Tables)	12 Months Ended
	Dec. 31, 2021
Louisiana Pigment Company, L.P.
Schedule of Equity Method Investments [Line Items]
Summary of Net Cash Distributions, Balance Sheets and Income Statements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Distributions from LPC ​ $ 40.6 ​ $ 32.7 ​ $ 28.5 Contributions to LPC ​ (49.9) ​ (45.5) ​ (24.7) Net distributions (contributions) ​ $ (9.3) ​ $ (12.8) ​ $ 3.8 ​ Summary balance sheets of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) ASSETS ​ ​ ​ Current assets ​ $ 105.8 ​ $ 111.7 Property and equipment, net ​ 134.1 ​ 142.6 Total assets ​ $ 239.9 ​ $ 254.3 ​ ​ ​ ​ ​ ​ ​ LIABILITIES AND PARTNERS’ EQUITY ​ ​ Other liabilities, primarily current ​ $ 30.6 ​ $ 47.8 Partners’ equity ​ 209.3 ​ 206.5 Total liabilities and partners’ equity ​ $ 239.9 ​ $ 254.3 ​ Summary income statements of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Revenues and other income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Kronos ​ $ 176.2 ​ $ 167.8 ​ $ 188.6 Venator Investments ​ 177.0 ​ 168.3 ​ 189.6 Total revenues and other income ​ 353.2 ​ 336.1 ​ 378.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost and expenses: ​ ​ ​ Cost of sales ​ 352.8 ​ 335.7 ​ 377.8 General and administrative ​ .4 ​ .4 ​ .4 Total costs and expenses ​ 353.2 ​ 336.1 ​ 378.2 Net income ​ $ - ​ $ - ​ $ -

Marketable Securities (Tables)

Marketable Securities (Tables)	12 Months Ended
	Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]
Classification of Marketable Securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value ​ ​ ​ ​ ​ ​ ​ ​ measurement ​ Market ​ Cost ​ Unrealized Marketable security level value basis gain (loss) ​ ​ ​ (In millions) December 31, 2020: ​ ​ ​ Valhi common stock 1 ​ $ 2.1 ​ $ 3.2 ​ $ (1.1) NL and CompX common stocks 1 ​ .1 ​ .1 ​ - Total ​ ​ ​ $ 2.2 ​ $ 3.3 ​ $ (1.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021: ​ ​ ​ ​ ​ Valhi common stock 1 ​ $ 4.1 ​ $ 3.2 ​ $ .9 NL and CompX common stocks 1 ​ .1 ​ .1 ​ - Total ​ $ 4.2 ​ $ 3.3 ​ $ .9

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Schedule of Future Minimum Payment under Non-Cancellable Operating Lease Liabilities	​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2022 ​ $ 4.2 2023 ​ 3.0 2024 ​ 2.1 2025 ​ 1.6 2026 ​ 1.4 2027 and thereafter ​ 17.6 Total remaining lease payments ​ 29.9 Less imputed interest ​ 10.4 Total lease obligations ​ 19.5 Less current obligations ​ 3.7 Long term lease obligations ​ $ 15.8

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Components of Long Term Debt	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Kronos International, Inc. 3.75% Senior Notes ​ $ 485.7 ​ $ 448.8 Other ​ 1.7 ​ 2.4 Total debt ​ 487.4 ​ 451.2 Less current maturities ​ .7 ​ 1.4 Total long-term debt ​ $ 486.7 ​ $ 449.8
Aggregate Maturities of Long-Term Debt and Other	​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2022 ​ $ 1.4 2023 ​ 1.0 2024 ​ - 2025 ​ 452.3 2026 ​ - 2027 and thereafter ​ - Gross maturities ​ 454.7 Less debt issuance costs ​ 3.5 Total ​ $ 451.2 ​

Accounts Payable and Accrued _2

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Payables And Accruals [Abstract]
Components of Accounts Payable and Accrued Liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Accounts payable ​ $ 111.0 ​ $ 143.6 Accrued sales discounts and rebates ​ 29.1 ​ 28.7 Employee benefits ​ 27.8 ​ 28.9 Operating lease liabilities ​ 6.7 ​ 3.7 Other ​ 41.3 ​ 52.0 Total ​ $ 215.9 ​ $ 256.9

Defined Contribution and Defi_2

Defined Contribution and Defined Benefit Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Funded Status of Defined Benefit Plan	The funded status of our non-U.S. defined benefit pension plans is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Change in projected benefit obligations (PBO): ​ ​ Benefit obligations at beginning of the year ​ $ 738.2 ​ $ 846.7 Service cost ​ 13.3 ​ 14.7 Interest cost ​ 10.0 ​ 8.2 Participant contributions ​ 1.8 ​ 2.0 Actuarial losses (gains) ​ 46.6 ​ (45.4) Change in currency exchange rates ​ 58.6 ​ (55.0) Benefits paid ​ (21.8) ​ (23.1) Benefit obligations at end of the year ​ 846.7 ​ 748.1 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 437.5 ​ 481.8 Actual return on plan assets ​ 18.7 ​ 17.7 Employer contributions ​ 16.0 ​ 18.7 Participant contributions ​ 1.8 ​ 2.0 Change in currency exchange rates ​ 29.6 ​ (27.0) Benefits paid ​ (21.8) ​ (23.1) Fair value of plan assets at end of year ​ 481.8 ​ 470.1 Funded status ​ $ (364.9) ​ $ (278.0) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Noncurrent pension asset ​ $ 4.5 ​ $ 7.6 Noncurrent accrued pension costs ​ (369.4) ​ (285.6) Total ​ $ (364.9) ​ $ (278.0) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss: ​ ​ Actuarial losses ​ $ 304.5 ​ $ 233.3 Prior service cost ​ .8 ​ .4 Total ​ $ 305.3 ​ $ 233.7 ​ ​ ​ ​ ​ ​ ​ Accumulated benefit obligations (ABO) ​ $ 819.7 ​ $ 723.7 The funded status of our U.S. defined benefit pension plan is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Change in PBO: ​ ​ Benefit obligations at beginning of the year ​ $ 18.3 ​ $ 19.4 Interest cost ​ .6 ​ .5 Actuarial losses (gains) ​ 1.6 ​ (.6) Settlements ​ ​ - ​ ​ (.5) Benefits paid ​ (1.1) ​ (1.1) Benefit obligations at end of the year ​ 19.4 ​ 17.7 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 14.6 ​ 16.1 Actual return on plan assets ​ 2.0 ​ .5 Employer contributions ​ .6 ​ .4 Benefits paid ​ (1.1) ​ (1.1) Fair value of plan assets at end of year ​ 16.1 ​ 15.9 Funded status ​ $ (3.3) ​ $ (1.8) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Accrued pension costs: ​ ​ Current ​ $ (.1) ​ $ - Noncurrent ​ (3.2) ​ (1.8) Total ​ $ (3.3) ​ $ (1.8) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss - actuarial losses ​ $ 10.9 ​ $ 9.8 ​ ​ ​ ​ ​ ​ ​ ABO ​ $ 19.4 ​ $ 17.7
Components of Net Periodic Benefit Cost (Credit)	The components of our net periodic defined benefit pension cost for our non-U.S. defined benefit pension plans are presented in the table below. The amounts shown below for the amortization of prior service cost and recognized actuarial losses for 2019, 2020 and 2021 were recognized as components of our accumulated other comprehensive loss at December 31, 2018, 2019 and 2020, respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Service cost ​ $ 12.8 ​ $ 13.3 ​ $ 14.7 Interest cost ​ 13.3 ​ 10.0 ​ 8.2 Expected return on plan assets ​ (11.7) ​ (8.7) ​ (11.2) Recognized actuarial losses ​ 12.8 ​ 17.3 ​ 19.4 Amortization of prior service cost ​ .2 ​ .2 ​ .2 Total ​ $ 27.4 ​ $ 32.1 ​ $ 31.3 The components of our net periodic defined benefit pension cost for our U.S. defined benefit pension plan is presented in the table below. The amounts shown below for recognized actuarial losses for 2019, 2020 and 2021 were recognized as components of our accumulated other comprehensive loss at December 31, 2018, 2019 and 2020 respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Interest cost on PBO ​ $ .7 ​ $ .6 ​ $ .5 Expected return on plan assets ​ (.7) ​ (.6) ​ (.6) Recognized actuarial losses ​ .6 ​ .6 ​ .6 Settlement gain ​ - ​ - ​ (.5) Total ​ $ .6 ​ $ .6 ​ $ -
Schedule of Defined Benefit Pension Plans Balances (for which Accumulated Benefit Obligation Exceeds Fair Value of Plan Assets)	Information concerning certain of our non-U.S. defined benefit pension plans (for which the ABO exceeds the fair value of plan assets as of the indicated date) is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Plans for which the ABO exceeds plan assets: ​ ​ PBO ​ $ 790.9 ​ $ 695.2 ABO ​ 768.1 ​ 674.4 Fair value of plan assets ​ 421.5 ​ 409.4
Key Actuarial Assumptions Used	The weighted-average rate assumptions used in determining the actuarial present value of benefit obligations for our non-U.S. defined benefit pension plans as of December 31, 2020 and 2021 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ December 31, Rate 2020 2021 Discount rate 1.0% ​ 1.5% Increase in future compensation levels 2.6% ​ 2.6% ​ The weighted-average rate assumptions used in determining the net periodic pension cost for our non-U.S. defined benefit pension plans for 2019, 2020 and 2021 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, Rate 2019 2020 2021 Discount rate 2.1% ​ 1.4% ​ 1.0% Increase in future compensation levels 2.6% ​ 2.6% ​ 2.6% Long-term return on plan assets 2.9% ​ 2.0% ​ 2.4% The weighted-average rate assumptions used in determining the net periodic pension cost for our U.S. defined benefit pension plan for 2019, 2020 and 2021 are presented in the table below. The impact of assumed increases in future compensation levels also does not have an effect on the periodic pension cost as the plan is frozen with regards to compensation. ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, Rate 2019 2020 2021 Discount rate 4.1% ​ 3.1% ​ 2.2% Long-term return on plan assets 5.5% ​ 4.5% ​ 4.0%
Defined Benefit Pension Plans
Benefit Payments	​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2022 ​ $ 25.5 2023 ​ 25.4 2024 ​ 27.4 2025 ​ 27.5 2026 ​ 29.1 Next 5 years ​ 167.8
Changes in Benefit Obligations Recognized in Accumulated Other Comprehensive Income (Loss)	The table below details the changes in our consolidated other comprehensive income (loss) during 2019, 2020 and 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Changes in plan assets and benefit obligations recognized in ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year: ​ ​ ​ Net actuarial (losses) gains ​ $ (48.5) ​ $ (36.8) ​ $ 52.5 Amortization of unrecognized: ​ ​ ​ Net actuarial losses ​ 13.4 ​ 17.9 ​ 20.0 Prior service cost ​ .2 ​ .2 ​ .2 Total ​ $ (34.9) ​ $ (18.7) ​ $ 72.7
Composition of Pension Plan Assets	The composition of our pension plan assets by asset category and fair value level at December 31, 2020 and 2021 is shown in the tables below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at December 31, 2020 ​ ​ ​ ​ ​ Quoted ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ prices ​ other ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ in active ​ observable ​ unobservable ​ Assets ​ ​ ​ ​ ​ markets ​ inputs ​ inputs ​ measured at ​ Total (Level 1) (Level 2) (Level 3) NAV ​ (In millions) Germany ​ $ 292.5 ​ $ - ​ $ - ​ $ 292.5 ​ $ - Canada: ​ ​ ​ ​ ​ Local currency equities ​ .2 ​ .2 ​ - ​ - ​ - Non local currency equities ​ 26.6 ​ 26.6 ​ - ​ - ​ - Local currency fixed income ​ 87.3 ​ 87.3 ​ - ​ - ​ - Cash and other ​ .9 ​ .9 ​ - ​ - ​ - Norway: ​ ​ ​ ​ ​ Local currency equities ​ 3.2 ​ 3.2 ​ - ​ - ​ - Non local currency equities ​ 6.3 ​ 6.3 ​ - ​ - ​ - Local currency fixed income ​ 26.4 ​ 16.3 ​ 10.1 ​ - ​ - Non local currency fixed income ​ 7.7 ​ 7.7 ​ - ​ - ​ - Real estate ​ 7.1 ​ - ​ - ​ 7.1 ​ - Cash and other ​ 5.5 ​ 4.8 ​ - ​ .7 ​ - U.S.: ​ ​ ​ ​ ​ Equities ​ 6.3 ​ .9 ​ - ​ .2 ​ 5.2 Fixed income ​ 8.1 ​ 8.1 ​ - ​ - ​ - Cash and other ​ 1.7 ​ 1.3 ​ - ​ - ​ .4 Other ​ 18.1 ​ 4.3 ​ - ​ 13.8 ​ - Total ​ $ 497.9 ​ $ 167.9 ​ $ 10.1 ​ $ 314.3 ​ $ 5.6 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at December 31, 2021 ​ ​ ​ ​ ​ Quoted ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ prices ​ other ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ in active ​ observable ​ unobservable ​ Assets ​ ​ ​ ​ ​ markets ​ inputs ​ inputs ​ measured at ​ Total (Level 1) (Level 2) (Level 3) NAV ​ ​ (In millions) Germany ​ $ 282.9 ​ $ - ​ $ - ​ $ 282.9 ​ $ - Canada: ​ ​ ​ ​ ​ Local currency equities ​ .2 ​ .2 ​ - ​ - ​ - Non local currency equities ​ 21.9 ​ 21.9 ​ - ​ - ​ - Local currency fixed income ​ 89.3 ​ 89.3 ​ - ​ - ​ - Cash and other ​ .8 ​ .8 ​ - ​ - ​ - Norway: ​ ​ ​ ​ ​ Local currency equities ​ 3.1 ​ 3.1 ​ - ​ - ​ - Non local currency equities ​ 5.9 ​ 5.9 ​ - ​ - ​ - Local currency fixed income ​ 25.1 ​ 15.9 ​ 9.2 ​ - ​ - Non local currency fixed income ​ 6.7 ​ 6.7 ​ - ​ - ​ - Real estate ​ 9.1 ​ - ​ - ​ 9.1 ​ - Cash and other ​ 7.0 ​ 6.4 ​ - ​ .6 ​ - U.S.: ​ ​ ​ ​ ​ Equities ​ 5.6 ​ .4 ​ - ​ - ​ 5.2 Fixed income ​ 9.3 ​ - ​ - ​ - ​ 9.3 Cash and other ​ 1.0 ​ .6 ​ - ​ - ​ .4 Other ​ 18.1 ​ .4 ​ - ​ 17.7 ​ - Total ​ $ 486.0 ​ $ 151.6 ​ $ 9.2 ​ $ 310.3 ​ $ 14.9
Roll forward of Change in Fair Value of Level 3 Assets	A rollforward of the change in fair value of Level 3 assets follows. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Fair value at beginning of year ​ $ 283.1 ​ $ 314.3 Gain on assets held at end of year ​ 4.2 ​ 15.6 Gain on assets sold during the year ​ - ​ .4 Assets purchased ​ 14.4 ​ 16.2 Assets sold ​ (14.1) ​ (14.8) Transfers in ​ ​ - ​ ​ 3.5 Currency exchange rate fluctuations ​ 26.7 ​ (24.9) Fair value at end of year ​ $ 314.3 ​ $ 310.3

Other Noncurrent Liabilities (T

Other Noncurrent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Components of Other Noncurrent Liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Accrued postretirement benefits ​ $ 8.7 ​ $ 8.4 Employee benefits ​ 6.2 ​ 6.1 Other ​ 11.8 ​ 13.5 Total ​ $ 26.7 ​ $ 28.0

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Pre-tax income: ​ ​ ​ U.S. ​ $ 37.9 ​ $ 20.9 ​ $ 25.5 Non-U.S. ​ 83.2 ​ 59.1 ​ 127.9 Total ​ $ 121.1 ​ $ 80.0 ​ $ 153.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expected tax expense, at U.S. federal statutory income tax rate of 21% ​ $ 25.4 ​ $ 16.8 ​ $ 32.2 Non-U.S. tax rates ​ 5.4 ​ .7 ​ 4.6 Incremental net tax benefit on earnings and losses of U.S. ​ (4.3) ​ (5.5) ​ (3.9) Valuation allowance, net ​ .7 ​ .8 ​ 3.1 Global intangible low-tax income, net ​ 2.4 ​ 2.7 ​ 2.8 Tax rate changes ​ 5.5 ​ (.3) ​ - Assessment (refund) of prior tax payments, net ​ (2.1) ​ (.1) ​ .1 Adjustment to the reserve for uncertain tax positions, net ​ .7 ​ .1 ​ - Nondeductible expenses ​ 1.4 ​ .9 ​ 1.0 Other, net ​ (1.1) ​ - ​ .6 Income tax expense ​ $ 34.0 ​ $ 16.1 ​ $ 40.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Components of income tax expense: ​ ​ ​ Current payable: ​ ​ ​ U.S. federal and state ​ $ 5.5 ​ $ 4.8 ​ $ 4.6 Non-U.S. ​ 21.9 ​ 14.9 ​ 21.6 ​ ​ 27.4 ​ 19.7 ​ 26.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred income taxes (benefit): ​ ​ ​ U.S. federal and state ​ .8 ​ (2.6) ​ 3.3 Non-U.S. ​ 5.8 ​ (1.0) ​ 11.0 ​ ​ 6.6 ​ (3.6) ​ 14.3 Income tax expense ​ $ 34.0 ​ $ 16.1 ​ $ 40.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Comprehensive provision for income taxes allocable to: ​ ​ ​ Net income ​ $ 34.0 ​ $ 16.1 ​ $ 40.5 Other comprehensive income (loss): ​ ​ ​ Pension plans ​ (13.7) ​ (6.0) ​ 24.0 OPEB plans ​ (.2) ​ (.2) ​ - Total ​ $ 20.1 ​ $ 9.9 ​ $ 64.5
Components of Net Deferred Income Taxes	The components of our net deferred income taxes at December 31, 2020 and 2021 are summarized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2020 ​ 2021 ​ Assets Liabilities Assets Liabilities ​ ​ (In millions) Tax effect of temporary differences related to: ​ ​ ​ ​ Inventories ​ $ 1.7 ​ $ - ​ $ - ​ $ (2.9) Property and equipment ​ - ​ (58.4) ​ - ​ (62.5) Lease assets (liabilities) ​ 6.4 ​ (6.5) ​ 5.0 ​ (5.1) Accrued OPEB costs ​ 2.4 ​ - ​ 2.3 ​ - Accrued pension costs ​ 100.0 ​ - ​ 73.6 ​ - Other accrued liabilities and deductible differences ​ 11.7 ​ - ​ 12.1 ​ - Other taxable differences ​ - ​ (1.4) ​ - ​ (3.3) Tax on unremitted earnings of non-U.S. subsidiaries ​ - ​ (12.0) ​ - ​ (11.2) Tax loss and tax credit carryforwards ​ 86.9 ​ - ​ 78.1 ​ - Valuation allowance ​ (4.4) ​ - ​ (7.4) ​ - Adjusted gross deferred tax assets (liabilities) ​ 204.7 ​ (78.3) ​ 163.7 ​ (85.0) Netting by tax jurisdiction ​ (53.7) ​ 53.7 ​ (56.9) ​ 56.9 Net noncurrent deferred tax asset (liability) ​ $ 151.0 ​ $ (24.6) ​ $ 106.8 ​ $ (28.1)
Changes in Amount of Uncertain Tax Positions	The following table shows the changes in the amount of our uncertain tax positions (exclusive of the effect of interest and penalties discussed above) during 2019, 2020 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Changes in unrecognized tax benefits: ​ ​ ​ Unrecognized tax benefits at beginning of year ​ $ 4.1 ​ $ 3.9 ​ $ 4.1 Net increase (decrease): ​ ​ ​ Tax positions taken in prior periods ​ (.8) ​ (.3) ​ - Tax positions taken in current period ​ .7 ​ .6 ​ .6 Lapse due to applicable statute of limitations ​ - ​ (.5) ​ (.7) Change in currency exchange rates ​ (.1) ​ .4 ​ (.2) Unrecognized tax benefits at end of year ​ $ 3.9 ​ $ 4.1 ​ $ 3.8

Stockholders' equity (Tables)

Stockholders' equity (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss	Accumulated other comprehensive loss – ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2019 2020 2021 ​ ​ (In millions) Accumulated other comprehensive loss, net of tax: ​ ​ ​ Currency translation: ​ ​ ​ Balance at beginning of period ​ $ (245.0) ​ $ (246.8) ​ $ (233.4) Other comprehensive income (loss) ​ (1.8) ​ 13.4 ​ (7.0) Balance at end of period ​ $ (246.8) ​ $ (233.4) ​ $ (240.4) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Defined benefit pension plans: ​ ​ ​ Balance at beginning of period ​ $ (180.0) ​ $ (202.2) ​ $ (214.5) Other comprehensive income - ​ ​ ​ amortization of prior service cost and net losses included in ​ 9.5 ​ 13.4 ​ 14.9 Net actuarial gain (loss) arising during year ​ (31.7) ​ (25.7) ​ 36.3 Balance at end of period ​ $ (202.2) ​ $ (214.5) ​ $ (163.3) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPEB plans: ​ ​ ​ Balance at beginning of period ​ $ .7 ​ $ .2 ​ $ (.3) Other comprehensive loss - ​ ​ ​ amortization of prior service credit and net losses included in ​ (.3) ​ (.2) ​ (.3) Net actuarial gain (loss) arising during year ​ (.2) ​ (.3) ​ .2 Balance at end of period ​ $ .2 ​ $ (.3) ​ $ (.4) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total accumulated other comprehensive loss: ​ ​ ​ Balance at beginning of period ​ $ (424.3) ​ $ (448.8) ​ $ (448.2) Other comprehensive income (loss) ​ (24.5) ​ .6 ​ 44.1 Balance at end of period ​ $ (448.8) ​ $ (448.2) ​ $ (404.1) ​ See Note 6 for further discussion on our marketable securities, Note 10 for amounts related to our defined benefit pension plans and Note 11 for our OPEB plans.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Summary of Receivables from and Payables to Affiliates	Receivables from and payables to affiliates are summarized in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2020 2021 ​ ​ (In millions) Current receivables from affiliates: ​ ​ LPC ​ $ - ​ $ 15.8 Other ​ 3.5 ​ 2.6 ​ ​ $ 3.5 ​ $ 18.4 ​ ​ ​ ​ ​ ​ ​ Current payables to affiliates: ​ ​ LPC ​ $ 19.3 ​ $ 17.3 Income taxes payable to Valhi ​ 8.6 ​ .9 ​ ​ $ 27.9 ​ $ 18.2 ​ ​ ​ ​ ​ ​ ​ Noncurrent payable to affiliate - ​ ​ Income taxes payable to Valhi (See Note 12) ​ $ 50.6 ​ $ 44.7

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Summary of Approximate Percentage of TiO2 Sales by Volume	The table below shows the approximate percentage of our TiO 2 ​ ​ ​ ​ ​ ​ ​ ​ 2019 ​ 2020 ​ 2021 Europe 46% ​ 46% ​ 46% North America 34% ​ 36% ​ 37%

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
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, 2020 and 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2021 ​ ​ Carrying ​ Fair ​ Carrying ​ Fair ​ ​ amount ​ value ​ amount ​ value ​ ​ (In millions) Cash, cash equivalents and restricted cash ​ $ 362.0 ​ $ 362.0 ​ $ 412.6 ​ $ 412.6 Long-term debt - Fixed rate Senior Notes ​ 485.7 ​ 499.9 ​ 448.8 ​ 460.2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization And Basis Of Presentation [Line Items]
Capitalized interest costs	$ 1.1	$ 0.5	$ 0.6
Income taxes paid, net	41.6	15.3	35.8
Cost of sales	1,493.2	1,287.6	1,344.9
Research and development costs	17	16	17
Shipping and Handling
Organization And Basis Of Presentation [Line Items]
Cost of sales	$ 132	112	111
Louisiana Pigment Company, L.P.
Organization And Basis Of Presentation [Line Items]
Owned manufacturing joint venture	50.00%
Valhi Inc
Organization And Basis Of Presentation [Line Items]
Income taxes paid, net	$ 17.6	$ 6.6	$ 10.7
Valhi Inc | Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	50.00%
Valhi Inc | NL Industries Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage in company	83.00%
NL Industries Inc. | Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	30.00%
Contran
Organization And Basis Of Presentation [Line Items]
Controlling interest description	Consequently, at December 31, 2021, Ms. Simmons 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%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2021
Buildings and improvements | Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	10 years
Buildings and improvements | Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	40 years
Machinery and equipment | Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	3 years
Machinery and equipment | Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	20 years
Mine development costs
Property Plant And Equipment [Line Items]
Mine development costs	units-of-production

Geographic Information - Additi

Geographic Information - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Non-U.S. Subsidiaries
Geographic Information [Line Items]
Net assets of non-US subsidiaries	$ 338	$ 319

Geographic Information - Net Sa

Geographic Information - Net Sales and Property and Equipment by Geographical Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 1,939.4	$ 1,638.8	$ 1,731.1
Net property and equipment	503.4	524.6
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	207.3	228.2
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	90.5	87.9
Belgium
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	106.9	107.3
Norway
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	85.2	86.7
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	13.5	14.5
Point of origin | Reportable Geographical Components | Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	971.7	836	883.6
Point of origin | Reportable Geographical Components | United States
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	1,052.1	978.8	998.5
Point of origin | Reportable Geographical Components | Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	371.9	319.5	328.7
Point of origin | Reportable Geographical Components | Belgium
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	295.7	249.5	270.7
Point of origin | Reportable Geographical Components | Norway
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	257.2	211.8	192.2
Point of origin | Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	(1,009.2)	(956.8)	(942.6)
Point of destination | Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	945	783.2	823.5
Point of destination | North America
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	645.7	569.3	575.6
Point of destination | Other
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 348.7	$ 286.3	$ 332

Accounts and Other Receivable_3

Accounts and Other Receivables, Net - Accounts and Other Receivables, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (2)	$ (1.9)
Total	360.7	319.5
Trade receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	326.3	294.8
Recoverable VAT and other receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	32.4	21.3
Refundable income taxes
Accounts Notes And Loans Receivable [Line Items]
Refundable income taxes	$ 4	$ 5.3

Inventories, Net - Schedule of

Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 76.3	$ 133.2
Work in process	30.4	36.8
Finished products	245.6	269.2
Supplies	80	79.8
Total	$ 432.3	$ 519

Investment in TiO2 Manufactur_3

Investment in TiO2 Manufacturing Joint Venture - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021USD ($)
Schedule of Equity Method Investments [Line Items]
Equity earnings of LPC	$ 0
Louisiana Pigment Company, L.P.
Schedule of Equity Method Investments [Line Items]
Equity interest in LPC	50.00%
Products purchased from plant	50.00%
Venator Materials PLC | Venator Group
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage owned by parent	100.00%
Venator Investments LLC
Schedule of Equity Method Investments [Line Items]
Equity interest in LPC	50.00%

Investment in TiO2 Manufactur_4

Investment in TiO2 Manufacturing Joint Venture - Components of Net Cash Distributions from (Contributions to) LPC (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Net distributions (contributions)	$ 3.8	$ (12.8)	$ (9.3)
Louisiana Pigment Company, L.P.
Schedule of Equity Method Investments [Line Items]
Distributions from LPC	28.5	32.7	40.6
Contributions to LPC	(24.7)	(45.5)	(49.9)
Net distributions (contributions)	$ 3.8	$ (12.8)	$ (9.3)

Investment in TiO2 Manufactur_5

Investment in TiO2 Manufacturing Joint Venture - Summary of Balance Sheets of LPC (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Current assets	$ 1,258	$ 1,218.3
Property and equipment, net	503.4	524.6
Total assets	2,012.8	2,036.7
LIABILITIES AND STOCKHOLDERS' EQUITY
Total liabilities and stockholders' equity	2,012.8	2,036.7
Louisiana Pigment Company, L.P.
ASSETS
Current assets	111.7	105.8
Property and equipment, net	142.6	134.1
Total assets	254.3	239.9
LIABILITIES AND STOCKHOLDERS' EQUITY
Other liabilities, primarily current	47.8	30.6
Partners' equity	206.5	209.3
Total liabilities and stockholders' equity	$ 254.3	$ 239.9

Investment in TiO2 Manufactur_6

Investment in TiO2 Manufacturing Joint Venture - Summary of Income Statements of LPC (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cost and expenses:
Net income	$ 112.9	$ 63.9	$ 87.1
Louisiana Pigment Company, L.P.
Revenues and other income:
Total revenues and other income	378.2	336.1	353.2
Cost and expenses:
Cost of sales	377.8	335.7	352.8
General and administrative	0.4	0.4	0.4
Total costs and expenses	378.2	336.1	353.2
Louisiana Pigment Company, L.P. | Kronos
Revenues and other income:
Total revenues and other income	188.6	167.8	176.2
Louisiana Pigment Company, L.P. | Venator Investments LLC
Revenues and other income:
Total revenues and other income	$ 189.6	$ 168.3	$ 177

Marketable Securities - Classif

Marketable Securities - Classification of Marketable Securities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Market value	$ 4.2	$ 2.2
Cost basis	3.3	3.3
Unrealized gain (loss)	0.9	(1.1)
Level 1 | Common stock | Valhi
Marketable Securities [Line Items]
Market value	4.1	2.1
Cost basis	3.2	3.2
Unrealized gain (loss)	0.9	(1.1)
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 - Additio

Marketable Securities - Additional Information (Detail) - Valhi Inc - Common stock - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Investments in publicly-traded shares	144,000	144,000
Quoted market price of per share	$ 28.75	$ 15.20

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Operating lease payment	$ 7.7	$ 7.6
Operating lease, expense	7.7	7.6
Operating lease right-of-use assets	19.9	$ 26.1
Operating lease, liability	$ 19.5
Operating lease, weighted average remaining lease term	17 years	15 years
Operating lease, weighted average discount rate	5.00%	4.80%
New Operating Leases
Lessee Lease Description [Line Items]
Operating lease, liability	$ 3.8	$ 2.5
Leverkusen Facility Land Lease
Lessee Lease Description [Line Items]
Agreements expiry period	2050
Current Tio2 production capacity in Leverkusen facility	33.00%
Operating lease, liability	$ 6.9

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Payment under Non-Cancellable Operating Lease Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
2022	$ 4.2
2023	3
2024	2.1
2025	1.6
2026	1.4
2027 and thereafter	17.6
Total remaining lease payments	29.9
Less imputed interest	10.4
Total lease obligations	$ 19.5
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accounts Payable And Accrued Liabilities Current, Operating lease liabilities
Less current obligations	$ 3.7	$ 6.7
Operating Lease Liability Current Statement Of Financial Position Extensible List	Accounts Payable And Accrued Liabilities Current	Accounts Payable And Accrued Liabilities Current
Operating lease liabilities	$ 15.8	$ 18.8

Long-Term Debt - Components of

Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Notes	$ 448.8	$ 485.7
Other	2.4	1.7
Total debt	451.2	487.4
Less current maturities	1.4	0.7
Total long-term debt	449.8	486.7
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Notes	$ 448.8	$ 485.7

Long-Term Debt - Senior Notes -

Long-Term Debt - Senior Notes - Additional Information (Detail) € in Millions, $ in Millions	Sep. 13, 2017EUR (€)	Sep. 13, 2017USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Sep. 13, 2017USD ($)
Senior Notes
Debt Instrument [Line Items]
Minimum amount of debt default for using customary default provisions		$ 50
Unamortized debt issuance costs			$ 3.5	$ 4.7
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Debt instrument principal amount	€ 400				$ 477.6
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, payments began 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, description			have a maturity date of September 15, 2025. 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. 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;
Debt instrument redemption price percent if experience certain specified change of control events		101.00%
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 | Non US 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 | Non US 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 | 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%

Long-Term Debt - Revolving Cred

Long-Term Debt - Revolving Credit Facility - Additional Information (Detail) € in Millions, $ in Millions, $ in Millions	Apr. 20, 2021USD ($)	Dec. 31, 2021USD ($)	Apr. 20, 2021CAD ($)	Apr. 20, 2021EUR (€)	Dec. 31, 2020USD ($)
European Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings under this credit facility		$ 0			$ 0
North American Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings under this credit facility		0			$ 0
Global Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 225
Line of Credit Maturity	2026-04
Fixed charge coverage ratio, minimum value	100.00%
Amount available for Borrowing		213
Borrowings under credit facility during the period		0
Repayments of lines of credit		$ 0
Global Revolver | Canadian Subsidiary Revolving Borrowings Maximum
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 25
Global Revolver | Belgian Subsidiary Revolving Borrowings Maximum
Debt Instrument [Line Items]
Maximum borrowing capacity | €				€ 30
Global Revolver | German Subsidiary Revolving Borrowings Maximum
Debt Instrument [Line Items]
Maximum borrowing capacity | €				€ 60
Minimum | Global Revolver | Non Base Rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	1.50%
Minimum | Global Revolver | Base Rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	0.50%
Maximum | Global Revolver | Non Base Rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	2.00%
Maximum | Global Revolver | Base Rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	2.00%

Long-Term Debt - Aggregate Matu

Long-Term Debt - Aggregate Maturities of Long-Term Debt and Other (Detail) $ in Millions	Dec. 31, 2021USD ($)
Long Term Debt By Maturity [Abstract]
2022	$ 1.4
2023	1
2025	452.3
Gross maturities	454.7
Less debt issuance costs	3.5
Total	$ 451.2

Accounts Payable and Accrued _3

Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Accounts payable	$ 143.6	$ 111
Accrued sales discounts and rebates	28.7	29.1
Employee benefits	28.9	27.8
Operating lease liabilities	$ 3.7	$ 6.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total	Total
Other	$ 52	$ 41.3
Total	$ 256.9	$ 215.9

Defined Contribution and Defi_3

Defined Contribution and Defined Benefit Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined contribution benefit plan expense	$ 3.9	$ 3.4	$ 3.1
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions next fiscal year	18
Defined Benefit Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan	$ 1.8	$ 3.3
Discount rate	2.60%	2.20%
Expected long-term rate of return	4.00%	4.50%	5.50%
Defined Benefit Pension Plans | United States | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	9.00%
Target asset allocation	33.00%
Defined Benefit Pension Plans | United States | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	3.00%
Target asset allocation	59.00%
Defined Benefit Pension Plans | United States | Multi-asset Strategies and CMRT
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	2.00%
Defined Benefit Pension Plans | United States | Assets valued at NAV
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	94.00%
Defined Benefit Pension Plans | Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan	$ 278	$ 364.9
Discount rate	1.50%	1.00%
Expected long-term rate of return	2.40%	2.00%	2.90%
Defined Benefit Pension Plans | Canada | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	20.00%
Defined Benefit Pension Plans | Canada | Equity Securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	20.00%
Defined Benefit Pension Plans | Canada | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	80.00%
Defined Benefit Pension Plans | Norway | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	5.00%
Target asset allocation	15.00%
Defined Benefit Pension Plans | Norway | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	2.00%
Target asset allocation	62.00%
Defined Benefit Pension Plans | Norway | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	4.00%
Target asset allocation	14.00%
Defined Benefit Pension Plans | Norway | Other Investment Securities And Cash
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7.00%
Defined Benefit Pension Plans | Norway | Real Estate And Other Investments
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation	17.00%

Defined Contribution and Defi_4

Defined Contribution and Defined Benefit Retirement Plans- Benefit Payments (Detail) - Defined Benefit Pension Plans $ in Millions	Dec. 31, 2021USD ($)
Defined Benefit Plan Disclosure [Line Items]
2022	$ 25.5
2023	25.4
2024	27.4
2025	27.5
2026	29.1
Next 5 years	$ 167.8

Defined Contribution and Defi_5

Defined Contribution and Defined Benefit Retirement Plans - Funded Status of Defined Benefit Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in the balance sheet:
Accrued pension costs, noncurrent	$ (287.4)	$ (372.6)
Defined Benefit Pension Plans
Change in plan assets:
Fair value of plan assets at beginning of the year	497.9
Fair value of plan assets at end of year	486	497.9
United States | Defined Benefit Pension Plans
Change in projected benefit obligations (PBO):
Benefit obligations at beginning of the year	19.4	18.3
Interest cost	0.5	0.6	$ 0.7
Actuarial losses (gains)	(0.6)	1.6
Settlements	(0.5)
Benefits paid	(1.1)	(1.1)
Benefit obligations at end of the year	17.7	19.4	18.3
Change in plan assets:
Fair value of plan assets at beginning of the year	16.1	14.6
Actual return on plan assets	0.5	2
Employer contributions	0.4	0.6
Settlement gain	(0.5)
Benefits paid	(1.1)	(1.1)
Fair value of plan assets at end of year	15.9	16.1	14.6
Funded status	(1.8)	(3.3)
Amounts recognized in the balance sheet:
Accrued pension costs, current		(0.1)
Accrued pension costs, noncurrent	(1.8)	(3.2)
Total	(1.8)	(3.3)
Amount recognized in accumulated other comprehensive loss, Actuarial losses	9.8	10.9
Accumulated benefit obligations (ABO)	17.7	19.4
Foreign Pension Plans Defined Benefit | Defined Benefit Pension Plans
Change in projected benefit obligations (PBO):
Benefit obligations at beginning of the year	846.7	738.2
Service cost	14.7	13.3	12.8
Interest cost	8.2	10	13.3
Participant contributions	2	1.8
Actuarial losses (gains)	(45.4)	46.6
Change in currency exchange rates	(55)	58.6
Benefits paid	(23.1)	(21.8)
Benefit obligations at end of the year	748.1	846.7	738.2
Change in plan assets:
Fair value of plan assets at beginning of the year	481.8	437.5
Actual return on plan assets	17.7	18.7
Employer contributions	18.7	16
Participant contributions	2	1.8
Change in currency exchange rates	(27)	29.6
Benefits paid	(23.1)	(21.8)
Fair value of plan assets at end of year	470.1	481.8	$ 437.5
Funded status	(278)	(364.9)
Amounts recognized in the balance sheet:
Noncurrent pension asset	7.6	4.5
Accrued pension costs, noncurrent	(285.6)	(369.4)
Total	(278)	(364.9)
Amount recognized in accumulated other comprehensive loss, Actuarial losses	233.3	304.5
Amount recognized in accumulated other comprehensive loss, Prior service cost	0.4	0.8
Amount recognized in accumulated other comprehensive loss, Total	233.7	305.3
Accumulated benefit obligations (ABO)	$ 723.7	$ 819.7

Defined Contribution and Defi_6

Defined Contribution and Defined Benefit Retirement Plans - Components of Net Periodic Benefit Cost (Credit) (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14.7	$ 13.3	$ 12.8
Interest cost	8.2	10	13.3
Expected return on plan assets	(11.2)	(8.7)	(11.7)
Recognized actuarial losses	19.4	17.3	12.8
Amortization of prior service cost	0.2	0.2	0.2
Total	31.3	32.1	27.4
United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.5	0.6	0.7
Expected return on plan assets	(0.6)	(0.6)	(0.7)
Recognized actuarial losses	0.6	0.6	0.6
Settlement gain	$ (0.5)
Total		$ 0.6	$ 0.6

Defined Contribution and Defi_7

Defined Contribution and Defined Benefit Retirement Plans- Schedule of Defined Benefit Pension Plans Balances (for which Accumulated Benefit Obligation Exceeds Fair Value of Plan Assets) (Detail) - Foreign Pension Plans Defined Benefit - Defined Benefit Pension Plans - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation (PBO)	$ 695.2	$ 790.9
Accumulated Benefit Obligation (ABO)	674.4	768.1
Fair value of plan assets	$ 409.4	$ 421.5

Defined Contribution and Defi_8

Defined Contribution and Defined Benefit Retirement Plans - Schedule of Assumptions Used (Detail) - Foreign Pension Plans Defined Benefit - Defined Benefit Pension Plans	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.50%	1.00%
Increase in future compensation levels	2.60%	2.60%

Defined Contribution and Defi_9

Defined Contribution and Defined Benefit Retirement Plans- Weighted Average Rate Assumptions Used in Determining Net Periodic Pension Cost (Detail) - Defined Benefit Pension Plans	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.00%	1.40%	2.10%
Increase in future compensation levels	2.60%	2.60%	2.60%
Long-term return on plan assets	2.40%	2.00%	2.90%
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.20%	3.10%	4.10%
Long-term return on plan assets	4.00%	4.50%	5.50%

Defined Contribution and Def_10

Defined Contribution and Defined Benefit Retirement Plans - Changes In Benefit Obligations Recognized In Accumulated Other Comprehensive Income (Loss) (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (losses) gains	$ 52.5	$ (36.8)	$ (48.5)
Net actuarial losses	20	17.9	13.4
Prior service cost	0.2	0.2	0.2
Total	$ 72.7	$ (18.7)	$ (34.9)

Defined Contribution and Def_11

Defined Contribution and Defined Benefit Retirement Plans- Composition of Pension Plan Assets (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 486	$ 497.9
Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	470.1	481.8	$ 437.5
Germany
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	282.9	292.5
Other.
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	18.1	18.1
United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	15.9	16.1	$ 14.6
Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	151.6	167.9
Level 1 | Other.
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.4	4.3
Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	9.2	10.1
Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	310.3	314.3
Level 3 | Germany
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	282.9	292.5
Level 3 | Other.
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	17.7	13.8
Assets Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	14.9	5.6
Local Currency Equities Member | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.2	0.2
Local Currency Equities Member | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3.1	3.2
Local Currency Equities Member | Level 1 | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.2	0.2
Local Currency Equities Member | Level 1 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3.1	3.2
Non Local Currency Equities | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	21.9	26.6
Non Local Currency Equities | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	5.9	6.3
Non Local Currency Equities | Level 1 | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	21.9	26.6
Non Local Currency Equities | Level 1 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	5.9	6.3
Local Currency Fixed Income | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	89.3	87.3
Local Currency Fixed Income | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	25.1	26.4
Local Currency Fixed Income | Level 1 | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	89.3	87.3
Local Currency Fixed Income | Level 1 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	15.9	16.3
Local Currency Fixed Income | Level 2 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	9.2	10.1
Other Investment Securities And Cash | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.8	0.9
Other Investment Securities And Cash | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	7	5.5
Other Investment Securities And Cash | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1	1.7
Other Investment Securities And Cash | Level 1 | Canada
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.8	0.9
Other Investment Securities And Cash | Level 1 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	6.4	4.8
Other Investment Securities And Cash | Level 1 | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.6	1.3
Other Investment Securities And Cash | Level 3 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.6	0.7
Other Investment Securities And Cash | Assets Measured at NAV | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.4	0.4
Non Local Currency Fixed Income | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	6.7	7.7
Non Local Currency Fixed Income | Level 1 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	6.7	7.7
Real Estate | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	9.1	7.1
Real Estate | Level 3 | Norway
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	9.1	7.1
Equity | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	5.6	6.3
Equity | Level 1 | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.4	0.9
Equity | Level 3 | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets		0.2
Equity | Assets Measured at NAV | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	5.2	5.2
Fixed Income | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	9.3	8.1
Fixed Income | Level 1 | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets		$ 8.1
Fixed Income | Assets Measured at NAV | United States
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 9.3

Defined Contribution and Def_12

Defined Contribution and Defined Benefit Retirement Plans - Rollforward of Change in Fair Value of Level 3 Assets (Detail) - Level 3 - Defined Benefit Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value at beginning of year	$ 314.3	$ 283.1
Gain on assets held at end of year	15.6	4.2
Gain on assets sold during the year	0.4
Assets purchased	16.2	14.4
Assets sold	(14.8)	(14.1)
Transfers in	3.5
Currency exchange rate fluctuations	(24.9)	26.7
Fair value at end of year	$ 310.3	$ 314.3

Other Noncurrent Liabilities -

Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Liabilities Noncurrent [Abstract]
Accrued postretirement benefits	$ 8.4	$ 8.7
Employee benefits	6.1	6.2
Other	13.5	11.8
Total	$ 28	$ 26.7

Income Taxes - Components of In

Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Income Tax [Line Items]
U.S.	$ 25.5	$ 20.9	$ 37.9
Non-U.S.	127.9	59.1	83.2
Income before income taxes	153.4	80	121.1
Expected tax expense, at U.S. federal statutory income tax rate of 21%	32.2	16.8	25.4
Non-U.S. tax rates	4.6	0.7	5.4
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. companies	(3.9)	(5.5)	(4.3)
Valuation allowance, net	3.1	0.8	0.7
Global intangible low-tax income, net	2.8	2.7	2.4
Tax rate changes		(0.3)	5.5
Assessment (refund) of prior tax payments, net	0.1	(0.1)	(2.1)
Adjustment to the reserve for uncertain tax positions, net		0.1	0.7
Nondeductible expenses	1	0.9	1.4
Other, net	0.6		(1.1)
Income tax expense	40.5	16.1	34
Current payable:
U.S. federal and state	4.6	4.8	5.5
Non-U.S.	21.6	14.9	21.9
Total	26.2	19.7	27.4
U.S. federal and state	3.3	(2.6)	0.8
Non-U.S.	11	(1)	5.8
Total	14.3	(3.6)	6.6
Income tax expense	40.5	16.1	34
Comprehensive provision for income taxes allocable to:
Net income	40.5	16.1	34
Other comprehensive income (loss):
Total	64.5	9.9	20.1
Defined Benefit Pension Plans
Other comprehensive income (loss):
Benefit plans	$ 24	(6)	(13.7)
OPEB
Other comprehensive income (loss):
Benefit plans		$ (0.2)	$ (0.2)

Income Taxes - Components of _2

Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S. Federal statutory income tax rate	21.00%

Income Taxes - Components of Ne

Income Taxes - Components of Net Deferred Income Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Inventories, Assets		$ 1.7
Lease assets	$ 5	6.4
Accrued OPEB costs, Assets	2.3	2.4
Accrued pension costs, Assets	73.6	100
Other accrued liabilities and deductible differences, Assets	12.1	11.7
Tax loss and tax credit carryforwards, Assets	78.1	86.9
Valuation allowance, Assets	(7.4)	(4.4)
Adjusted gross deferred tax assets	163.7	204.7
Netting by tax jurisdiction, Assets	(56.9)	(53.7)
Net noncurrent deferred tax asset	106.8	151
Inventories, Liabilities	(2.9)
Property and equipment, Liabilities	(62.5)	(58.4)
Lease liabilities	(5.1)	(6.5)
Other taxable differences, Liabilities	(3.3)	(1.4)
Tax on unremitted earnings of non-U.S. subsidiaries, Liabilities	(11.2)	(12)
Adjusted gross deferred tax liabilities	(85)	(78.3)
Netting by tax jurisdiction, Liabilities	56.9	53.7
Net noncurrent deferred tax liability	$ (28.1)	$ (24.6)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	Mar. 27, 2020	Mar. 26, 2020	Mar. 31, 2021	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax [Line Items]
Deferred tax assets valuation allowance						$ 7.4	$ 4.4
Transition tax					$ 74.5
Income tax liability payable period						8 years
Noncurrent payable to affiliate						$ 44.7	50.6
Current payable to affiliate						18.2	27.9
Current cash tax benefit						(21.6)	(14.9)	$ (21.9)
Non-cash deferred income tax benefit						(11)	1	$ (5.8)
Business interest income, adjusted taxable income		30.00%
CARES act of 2020, Business interest income, adjusted taxable income	50.00%
Cash tax benefit due to reversal of valuation allowance			$ 0.5
Increase decrease in valuation allowance							$ 2.8
Estimated unrecognized tax benefits decrease amount for next twelve months						1.1
Unrecognized tax benefits that would impact effective tax rate						3.8
Valhi | Income Tax Payable
Income Tax [Line Items]
Payable to affiliate						50.6
Noncurrent payable to affiliate						44.7
Current payable to affiliate						5.9
Corporate Purposes
Income Tax [Line Items]
Deferred tax assets valuation allowance						0
Germany
Income Tax [Line Items]
Income tax benefit				$ 3
Current cash tax benefit				1.5
Non-cash deferred income tax benefit				1.5
Non-cash deferred income tax expense				$ 5.5
Germany | Corporate Purposes
Income Tax [Line Items]
Net operating loss carryforwards						451
Belgium | Corporate Purposes
Income Tax [Line Items]
Net operating loss carryforwards						$ 19

Income Taxes - Changes in Amoun

Income Taxes - Changes in Amount of Uncertain Tax Positions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 4.1	$ 3.9	$ 4.1
Net increase (decrease):
Tax positions taken in prior periods		(0.3)	(0.8)
Tax positions taken in current period	0.6	0.6	0.7
Lapse due to applicable statute of limitations	(0.7)	(0.5)
Change in currency exchange rates	(0.2)	0.4	(0.1)
Unrecognized tax benefits at end of year	$ 3.8	$ 4.1	$ 3.9

Stockholders' equity - Addition

Stockholders' equity - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Existing long-term incentive plan				200,000
Shares available for awards under proposed long term incentive plan	120,200
Shares awarded under proposed long term incentive plan	7,200	13,500	9,000
Number of shares authorized for repurchase				2,000,000
Aggregate purchase price	$ 0.2	$ 1	$ 3
Shares available for repurchase under the plan	1,549,110
Common stock
Accumulated Other Comprehensive Income Loss [Line Items]
Stock repurchased and acquired in market transactions	14,409	122,489	264,992
Treasury Stock, Common
Accumulated Other Comprehensive Income Loss [Line Items]
Aggregate purchase price	$ 0.2	$ 1	$ 3

Stockholders' equity - Schedule

Stockholders' equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 796.5	$ 816.1	$ 839.8
Ending Balance	870.2	796.5	816.1
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(233.4)	(246.8)	(245)
Other comprehensive income (loss)	(7)	13.4	(1.8)
Ending Balance	(240.4)	(233.4)	(246.8)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(214.5)	(202.2)	(180)
Other comprehensive income (loss)	14.9	13.4	9.5
Net actuarial gain (loss) arising during year	36.3	(25.7)	(31.7)
Ending Balance	(163.3)	(214.5)	(202.2)
Accumulated Defined Benefit Plans Adjustment | OPEB
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(0.3)	0.2	0.7
Other comprehensive income (loss)	(0.3)	(0.2)	(0.3)
Net actuarial gain (loss) arising during year	0.2	(0.3)	(0.2)
Ending Balance	(0.4)	(0.3)	0.2
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(448.2)	(448.8)	(424.3)
Other comprehensive income (loss)	44.1	0.6	(24.5)
Ending Balance	$ (404.1)	$ (448.2)	$ (448.8)

Related Party Transactions - Su

Related Party Transactions - Summary of Receivables from and Payables to Affiliates (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Current receivable from affiliate	$ 18.4	$ 3.5
Current payable to affiliate	18.2	27.9
Noncurrent payable to affiliate	44.7	50.6
Other Affiliates | Other Receivable
Related Party Transaction [Line Items]
Current receivable from affiliate	2.6	3.5
Louisiana Pigment Company, L.P. | Trade Items
Related Party Transaction [Line Items]
Current receivable from affiliate	15.8
Current payable to affiliate	17.3	19.3
Valhi | Income Tax Payable
Related Party Transaction [Line Items]
Current payable to affiliate	0.9	8.6
Noncurrent payable to affiliate	$ 44.7	$ 50.6

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Insurance Premiums
Related Party Transaction [Line Items]
Expense transaction with affiliate	$ 23,200,000	$ 19,100,000
Contran
Related Party Transaction [Line Items]
Expense transaction with affiliate	300,000	300,000	$ 200,000
Sublease rent expense	400,000	400,000	100,000
Contran | Intercorporate Services Agreement
Related Party Transaction [Line Items]
Intercorporate services fees	24,000,000	23,300,000	22,800,000
Louisiana Pigment Company, L.P. | Titanium Dioxide Pigments
Related Party Transaction [Line Items]
Purchase of TiO2	188,600,000	167,800,000	176,200,000
Louisiana Pigment Company, L.P. | Titanium Dioxide Feedstock
Related Party Transaction [Line Items]
Sales of feedstock ore to LPC	85,400,000	84,200,000	$ 84,100,000
Valhi Inc | Unsecured Revolving Demand Promissory Note
Related Party Transaction [Line Items]
Outstanding loans under promissory note	$ 0	0
Maximum lending capacity				$ 30,000,000
Percentage of Interest over Prime rate			1.00%
Interest payable quarterly for the loan	prime plus 1.00%
Valhi Inc | Unsecured Revolving Demand Promissory Note | Interest Income
Related Party Transaction [Line Items]
Interest income on loan	$ 200,000	300,000	$ 500,000
Tall Pines Insurance Inc and EWIRE Inc | Insurance Premiums
Related Party Transaction [Line Items]
Expense transaction with affiliate			$ 12,500,000
Tall Pines Insurance Company | Insurance Premiums
Related Party Transaction [Line Items]
Expense transaction with affiliate	$ 18,600,000	$ 14,800,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)customer	Dec. 31, 2020customer	Dec. 31, 2019customer	Dec. 31, 2022USD ($)
Titanium Dioxide Pigments
Commitment And Contingencies [Line Items]
TiO2 Customers | customer	4,000
Feedstock
Commitment And Contingencies [Line Items]
Minimum purchase commitments | $	$ 800			$ 500
Various Raw Materials and Services
Commitment And Contingencies [Line Items]
Minimum purchase commitments | $	$ 64			$ 29
Net Sales | Product Concentration Risk | Titanium Dioxide Pigments
Commitment And Contingencies [Line Items]
Approximate percent sales by volume	92.00%	93.00%	94.00%
Net Sales | Customer Concentration Risk | Titanium Dioxide Pigments | Top ten customers
Commitment And Contingencies [Line Items]
Approximate percent sales by volume	32.00%	34.00%	36.00%
Net Sales | Customer Concentration Risk | Titanium Dioxide Pigments | One customer
Commitment And Contingencies [Line Items]
Approximate percent sales by volume		10.00%	10.00%
TiO2 Customers | customer		1	1

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Approximate Percentage of TiO2 Sales by Volume (Detail) - Net Sales - Geographic Concentration Risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Europe
Schedule Of Net Sales By Geographical Segment [Line Items]
Approximate percent sales by volume	46.00%	46.00%	46.00%
North America
Schedule Of Net Sales By Geographical Segment [Line Items]
Approximate percent sales by volume	37.00%	36.00%	34.00%

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - Senior Notes	Dec. 31, 2021EUR (€)
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount	€ 1,000
Debt instrument estimated market price per 1000 principal amount	€ 1,018

Financial Instruments - Financi

Financial Instruments - Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Cash, cash equivalents and restricted cash, Carrying amount	$ 412.6	$ 362	$ 392.3	$ 374.7
Long-term debt - Fixed rate Senior Notes, Carrying amount	448.8	485.7
Cash, cash equivalents and restricted cash, Fair value	412.6	362
Long-term debt - Fixed rate Senior Notes, Fair value	$ 460.2	$ 499.9