Kronos Worldwide (KRO) 10-K 8 Mar 23 2022 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Feb. 28, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
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		115,308,469
Entity Public Float			$ 407.1
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0001257640
Current Fiscal Year End Date	--12-31
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, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 327.8	$ 406
Restricted cash	2	2.1
Accounts and other receivables, net	252.4	360.7
Receivables from affiliates	2.7	18.4
Inventories, net	608.7	432.3
Prepaid expenses and other	48.6	38.5
Total current assets	1,242.2	1,258
Other assets:
Investment in TiO2 manufacturing joint venture	112.9	101.9
Restricted cash	4.8	4.5
Marketable securities	3.2	4.2
Operating lease right-of-use assets	21.5	19.9
Deferred income taxes	52	106.8
Other	13.3	14.1
Total other assets	207.7	251.4
Property and equipment:
Land	41.9	43.9
Buildings	214.7	222.2
Equipment	1,093.2	1,122.1
Mining properties	119.6	129.6
Construction in progress	76.5	72.7
Gross property and equipment	1,545.9	1,590.5
Less accumulated depreciation and amortization	1,061.4	1,087.1
Net property and equipment	484.5	503.4
Total assets	1,934.4	2,012.8
Current liabilities:
Current maturities of long-term debt	1.1	1.4
Accounts payable and accrued liabilities	289.4	256.9
Current payable to affiliate	22.9	18.2
Income taxes	13.3	12.3
Total current liabilities	326.7	288.8
Noncurrent liabilities:
Long-term debt	424.1	449.8
Accrued pension costs	128.6	287.4
Payable to affiliate - income taxes	33.5	44.7
Operating lease liabilities	17.4	15.8
Deferred income taxes	26.4	28.1
Other	20.5	28
Total noncurrent liabilities	650.5	853.8
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	1,394.3	1,395.4
Retained deficit	(105.4)	(122.1)
Accumulated other comprehensive loss	(331.5)	(404.1)
Treasury stock, at cost	(1.4)	(0.2)
Total stockholders' equity	957.2	870.2
Total liabilities and stockholders' equity	$ 1,934.4	2,012.8
Commitments and contingencies (Notes 12 and 15)

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares 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, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net sales	$ 1,930.2	$ 1,939.4	$ 1,638.8
Cost of sales	1,539.1	1,493.2	1,287.6
Gross margin	391.1	446.2	351.2
Selling, general and administrative expense	231.3	248.9	218.6
Other operating income (expense):
Currency transactions, net	11.5	1.6	(4)
Other income, net	3.4	3.2	1.4
Corporate expense	(15.1)	(15)	(13.8)
Income from operations	159.6	187.1	116.2
Other income (expense):
Interest and dividend income	5.1	0.4	1.8
Insurance settlement gain			1.5
Marketable equity securities	(1)	2	(1.1)
Other components of net periodic pension and OPEB cost	(12.9)	(16.5)	(19.4)
Interest expense	(16.9)	(19.6)	(19)
Income before income taxes	133.9	153.4	80
Income tax expense	29.4	40.5	16.1
Net income	$ 104.5	$ 112.9	$ 63.9
Net income per share - basic	$ 0.90	$ 0.98	$ 0.55
Net income per share - diluted	$ 0.90	$ 0.98	$ 0.55
Weighted average shares outstanding - basic	115.5	115.5	115.6
Weighted average shares outstanding - diluted	115.5	115.5	115.6

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income	$ 104.5	$ 112.9	$ 63.9
Other comprehensive income (loss), net of tax:
Currency translation	(28.8)	(7)	13.4
Total other comprehensive income, net	72.6	44.1	0.6
Comprehensive income	177.1	157	64.5
Defined benefit pension plans
Other comprehensive income (loss), net of tax:
Defined benefit plans	100.2	51.2	(12.3)
Other postretirement benefit plans
Other comprehensive income (loss), net of tax:
Defined benefit plans	$ 1.2	$ (0.1)	$ (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, 2019	$ 1.2	$ 1,396.2	$ (132.5)	$ (448.8)		$ 816.1
Net income			63.9			63.9
Other comprehensive income, 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, 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
Net income			104.5			104.5
Other comprehensive income, net of tax				72.6		72.6
Issuance of common stock		0.2				0.2
Dividends paid			(87.8)			(87.8)
Treasury stock acquired					(2.5)	(2.5)
Treasury stock retired		(1.3)			1.3
Ending Balance at Dec. 31, 2022	$ 1.2	$ 1,394.3	$ (105.4)	$ (331.5)	$ (1.4)	$ 957.2

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 104.5	$ 112.9	$ 63.9
Depreciation	51.7	51.3	58.1
Amortization of operating lease right-of-use assets	4.5	6.6	6.5
Deferred income taxes	(1.4)	14.3	(3.2)
Benefit plan expense greater than cash funding	8.7	11.9	15.7
Marketable equity securities	1	(2)	1.1
Distributions from (contributions to) TiO2 manufacturing joint venture, net	(10.5)	3.8	(12.8)
Other, net	3.5	0.8	0.9
Change in assets and liabilities:
Accounts and other receivables, net	85.7	(58.6)	(4.7)
Inventories, net	(198.4)	65.8	13.3
Prepaid expenses	(12.5)	(20.5)	(3)
Accounts payable and accrued liabilities	36.7	47.2	(33.2)
Income taxes	(0.1)	(1.6)	6.6
Accounts with affiliates	8.7	(26.3)	(4.3)
Other noncurrent assets	0.3	(5.1)	(4.6)
Other noncurrent liabilities	(0.7)	6	2.2
Net cash provided by operating activities	81.7	206.5	102.5
Cash flows from investing activities:
Capital expenditures	(63.2)	(58.6)	(62.8)
Proceeds from insurance settlement			1.5
Other	0.1
Net cash used in investing activities	(63.1)	(58.6)	(61.3)
Cash flows from financing activities:
Payments on long-term debt	(1.3)	(1.4)	(1.1)
Deferred financing fees	(0.1)	(1.9)
Dividends paid	(87.8)	(83.2)	(83.2)
Treasury stock acquired	(2.3)	(0.2)	(1)
Net cash used in financing activities	(91.5)	(86.7)	(85.3)
Cash, cash equivalents and restricted cash - net change from:
Operating, investing and financing activities	(72.9)	61.2	(44.1)
Effect of currency exchange rate changes on cash	(5.1)	(10.6)	13.8
Net change for the year	(78)	50.6	(30.3)
Balance at beginning of year	412.6	362	392.3
Balance at end of year	334.6	412.6	362
Cash paid for:
Interest, net of amount capitalized	15.7	18	18
Income taxes	37.3	41.6	15.3
Accrual for capital expenditures	$ 6.6	$ 4.8	$ 5.8

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
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 – Derivatives and hedging activities Cash and cash equivalents – Restricted cash – the liability. To the extent the restricted amount does not relate to a recognized liability, we classify restricted cash as a current asset. Restricted cash classified as a current asset and restricted cash classified as a noncurrent asset are presented separately on our Consolidated Balance Sheets. 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 marketable equity securities are recognized in Other income (expense) - Marketable equity securities on our Consolidated Statements of Income. We accumulate unrealized gains and losses on marketable debt securities as part of accumulated other comprehensive income (loss), net of related deferred income taxes. 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 leases (in which leases with an original maturity of 12 months or less are excluded from the recognition requirements of ASC 842). 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 mine 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 – 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, 2022, 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, 2022
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, 2021 and 2022, the net assets of non-U.S. subsidiaries included in consolidated net assets approximated $338 million and $504 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, ​ 2020 2021 2022 ​ ​ (In millions) Net sales - point of origin: ​ ​ ​ ​ ​ ​ ​ ​ ​ United States ​ $ 978.8 ​ $ 1,052.1 ​ $ 1,226.6 Germany ​ 836.0 ​ 971.7 ​ 895.4 Canada ​ 319.5 ​ 371.9 ​ 389.4 Belgium ​ 249.5 ​ 295.7 ​ 306.5 Norway ​ 211.8 ​ 257.2 ​ 273.5 Eliminations ​ (956.8) ​ (1,009.2) ​ (1,161.2) Total ​ $ 1,638.8 ​ $ 1,939.4 ​ $ 1,930.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net sales - point of destination: ​ ​ ​ Europe ​ $ 783.2 ​ $ 945.0 ​ $ 878.3 North America ​ 569.3 ​ 645.7 ​ 695.7 Other ​ 286.3 ​ 348.7 ​ 356.2 Total ​ $ 1,638.8 ​ $ 1,939.4 ​ $ 1,930.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Identifiable assets - net property and equipment: ​ ​ Germany ​ $ 207.3 ​ $ 198.5 Belgium ​ 106.9 ​ 100.8 Canada ​ 90.5 ​ 87.8 Norway ​ 85.2 ​ 82.7 Other ​ 13.5 ​ 14.7 Total ​ $ 503.4 ​ $ 484.5 ​

Accounts and Other Receivables,

Accounts and Other Receivables, Net	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Accounts and Other Receivables, Net	Note 3 – Accounts and other receivables, net: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Trade receivables ​ $ 326.3 ​ $ 220.3 Recoverable VAT and other receivables ​ 32.4 ​ 28.5 Refundable income taxes ​ 4.0 ​ 7.1 Allowance for doubtful accounts ​ (2.0) ​ (3.5) Total ​ $ 360.7 ​ $ 252.4 ​

Inventories, Net

Inventories, Net	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventories, Net	Note 4 – Inventories, net: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Raw materials ​ $ 76.3 ​ $ 145.3 Work in process ​ 30.4 ​ 32.0 Finished products ​ 245.6 ​ 349.9 Supplies ​ 80.0 ​ 81.5 Total ​ $ 432.3 ​ $ 608.7 ​

Investment in TiO2 Manufacturin

Investment in TiO2 Manufacturing Joint Venture	12 Months Ended
	Dec. 31, 2022
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, ​ 2020 2021 2022 ​ ​ (In millions) Distributions from LPC ​ $ 32.7 ​ $ 28.5 ​ $ 58.3 Contributions to LPC ​ (45.5) ​ (24.7) ​ (68.8) Net distributions (contributions) ​ $ (12.8) ​ $ 3.8 ​ $ (10.5) ​ Summary balance sheets of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) ASSETS ​ ​ ​ Current assets ​ $ 111.7 ​ $ 122.2 Property and equipment, net ​ 142.6 ​ 147.4 Total assets ​ $ 254.3 ​ $ 269.6 ​ ​ ​ ​ ​ ​ ​ LIABILITIES AND PARTNERS’ EQUITY ​ ​ Other liabilities, primarily current ​ $ 47.8 ​ $ 41.2 Partners’ equity ​ 206.5 ​ 228.4 Total liabilities and partners’ equity ​ $ 254.3 ​ $ 269.6 ​ Summary income statements of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Revenues and other income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Kronos ​ $ 167.8 ​ $ 188.6 ​ $ 225.6 Venator Investments ​ 168.3 ​ 189.6 ​ 225.9 Total revenues and other income ​ 336.1 ​ 378.2 ​ 451.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost and expenses: ​ ​ ​ Cost of sales ​ 335.7 ​ 377.8 ​ 451.1 General and administrative ​ .4 ​ .4 ​ .4 Total costs and expenses ​ 336.1 ​ 378.2 ​ 451.5 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, 2022
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 equity 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, 2021: ​ ​ ​ Valhi common stock 1 ​ $ 4.1 ​ $ 3.2 ​ $ .9 NL and CompX common stocks 1 ​ .1 ​ .1 ​ - Total ​ ​ ​ $ 4.2 ​ $ 3.3 ​ $ .9 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ Valhi common stock 1 ​ $ 3.2 ​ $ 3.2 ​ $ - ​ At December 31, 2021 and 2022, we held approximately 144,000 shares of Valhi’s common stock. The per share quoted market price of Valhi’s common stock was $28.75 and $22.00, at December 31, 2021 and 2022, respectively. We held a nominal number of shares of CompX and NL common stocks at December 31, 2021. During the second quarter of 2022 we sold all of our shares of NL and CompX common stock to the respective issuer in two separate private transactions that were approved in advance by our independent directors (using a 10-day trailing average price per share to determine the purchase price) for an aggregate sales price of $.1 million. The Valhi common stock we own is 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, 2022
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 202 At December 31, 2022, maturities of our operating lease liabilities were as follows: ​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2023 ​ $ 4.5 2024 ​ 3.3 2025 ​ 2.7 2026 ​ 2.4 2027 ​ 1.5 2028 and thereafter ​ 17.0 Total remaining lease payments ​ 31.4 Less imputed interest ​ 10.2 Total lease obligations ​ 21.2 Less current obligations ​ 3.8 Long term lease obligations ​ $ 17.4 ​ 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 $21.2 million total lease obligations at December 31, 2022, $7.2 million relates to our Leverkusen facility land lease. At December 31, 2022, we have no significant lease commitments that have not yet commenced. ​

Long-Term debt

Long-Term debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Long-Term Debt	Note 8 – Long-term debt: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Kronos International, Inc. 3.75% Senior Notes ​ $ 448.8 ​ $ 424.1 Other ​ 2.4 ​ 1.1 Total debt ​ 451.2 ​ 425.2 Less current maturities ​ 1.4 ​ 1.1 Total long-term debt ​ $ 449.8 ​ $ 424.1 ​ Senior Secured 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 100.938% 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, 2022 is stated net of unamortized debt issuance costs of $2.4 million (December 31, 2021 - $3.5 million). Revolving credit facility – 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. During 2022, we had no borrowings Aggregate maturities and other ​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2023 ​ $ 1.1 2024 ​ - 2025 ​ 426.5 2026 ​ - 2027 ​ - 2028 and thereafter ​ - Gross maturities ​ 427.6 Less debt issuance costs ​ 2.4 Total ​ $ 425.2 ​ We are in compliance with all of our debt covenants at December 31, 2022.

Accounts Payable and Accrued Li

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2022
Payables And Accruals [Abstract]
Accounts Payable and Accrued Liabilities	Note 9 – Accounts payable and accrued liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Accounts payable ​ $ 143.6 ​ $ 177.2 Accrued sales discounts and rebates ​ 28.7 ​ 25.6 Employee benefits ​ 28.9 ​ 22.9 Operating lease liabilities ​ 3.7 ​ 3.8 Other ​ 52.0 ​ 59.9 Total ​ $ 256.9 ​ $ 289.4 ​

Defined contribution and define

Defined contribution and defined benefit retirement plans	12 Months Ended
	Dec. 31, 2022
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 $17 million to all of our defined benefit pension plans during 2023. Benefit payments to plan participants out of plan assets are expected to be the equivalent of: ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2023 ​ $ 23.0 2024 ​ 24.7 2025 ​ 25.1 2026 ​ 26.4 2027 ​ 28.5 Next 5 years ​ 158.7 ​ The funded status of our non-U.S. defined benefit pension plans is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Change in projected benefit obligations (PBO): ​ ​ Benefit obligations at beginning of the year ​ $ 846.7 ​ $ 748.1 Service cost ​ 14.7 ​ 11.3 Interest cost ​ 8.2 ​ 10.5 Participant contributions ​ 2.0 ​ 1.7 Actuarial gains ​ (45.4) ​ (195.8) Settlements ​ - ​ (1.2) Change in currency exchange rates ​ (55.0) ​ (50.3) Benefits paid ​ (23.1) ​ (21.5) Benefit obligations at end of the year ​ 748.1 ​ 502.8 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 481.8 ​ 470.1 Actual return on plan assets ​ 17.7 ​ (49.5) Employer contributions ​ 18.7 ​ 15.0 Participant contributions ​ 2.0 ​ 1.7 Settlements ​ - ​ (1.2) Change in currency exchange rates ​ (27.0) ​ (31.0) Benefits paid ​ (23.1) ​ (21.5) Fair value of plan assets at end of year ​ 470.1 ​ 383.6 Funded status ​ $ (278.0) ​ $ (119.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Noncurrent pension asset ​ $ 7.6 ​ $ 8.2 Noncurrent accrued pension costs ​ (285.6) ​ (127.4) Total ​ $ (278.0) ​ $ (119.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss: ​ ​ Actuarial losses ​ $ 233.3 ​ $ 85.4 Prior service cost ​ .4 ​ .4 Total ​ $ 233.7 ​ $ 85.8 ​ ​ ​ ​ ​ ​ ​ Accumulated benefit obligations (ABO) ​ $ 723.7 ​ $ 488.0 ​ The total net underfunded status of our non-U.S. defined benefit pension plans decreased from $278.0 million at December 31, 2021 to $119.2 million at December 31, 2022 due to the change in our PBO during 2022 exceeding the change in plan assets during 2022. The decrease in our PBO in 2022 was primarily attributable to higher actuarial gains due to the increase in discount rates from year end 2021 and favorable currency fluctuations, primarily from the strengthening of the U.S. dollar relative to the euro. The decrease in our plan assets in 2022 was primarily attributable to the net effects of negative plan asset returns in 2022, unfavorable currency fluctuations, primarily from the strengthening of the U.S. dollar relative to the euro and employer contributions. 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 2020, 2021 and 2022 were recognized as components of our accumulated other comprehensive loss at December 31, 2019, 2020 and 2021, respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Service cost $ 13.3 ​ $ 14.7 ​ $ 11.3 Interest cost 10.0 ​ 8.2 ​ 10.5 Expected return on plan assets (8.7) ​ (11.2) ​ (11.0) Amortization of prior service cost ​ .2 ​ ​ .2 ​ ​ .1 Recognized actuarial losses 17.3 ​ 19.4 ​ 12.5 Settlements ​ - ​ ​ - ​ ​ .3 Total $ 32.1 ​ $ 31.3 ​ $ 23.7 ​ 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, ​ 2021 2022 ​ ​ (In millions) Plans for which the ABO exceeds plan assets: ​ ​ PBO ​ $ 695.2 ​ $ 403.5 ABO ​ 674.4 ​ 392.4 Fair value of plan assets ​ 409.4 ​ 276.0 ​ 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, 2021 and 2022 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ December 31, Rate 2021 2022 Discount rate 1.5% ​ 3.9% Increase in future compensation levels 2.6% ​ 2.7% ​ The weighted-average rate assumptions used in determining the net periodic pension cost for our non-U.S. defined benefit pension plans for 2020, 2021 and 2022 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, Rate 2020 2021 2022 Discount rate 1.4% ​ 1.0% ​ 1.5% Increase in future compensation levels 2.6% ​ 2.6% ​ 2.6% Long-term return on plan assets 2.0% ​ 2.4% ​ 2.5% ​ 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, ​ 2021 2022 ​ ​ (In millions) Change in PBO: ​ ​ Benefit obligations at beginning of the year ​ $ 19.4 ​ $ 17.7 Interest cost ​ .5 ​ .4 Actuarial gains ​ (.6) ​ (3.9) Settlements ​ ​ (.5) ​ ​ - Benefits paid ​ (1.1) ​ (1.0) Benefit obligations at end of the year ​ 17.7 ​ 13.2 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 16.1 ​ 15.9 Actual return on plan assets ​ .5 ​ (3.2) Employer contributions ​ .4 ​ .3 Benefits paid ​ (1.1) ​ (1.0) Fair value of plan assets at end of year ​ 15.9 ​ 12.0 Funded status ​ $ (1.8) ​ $ (1.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Accrued pension costs: ​ ​ Current ​ $ - ​ $ - Noncurrent ​ (1.8) ​ (1.2) Total ​ $ (1.8) ​ $ (1.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss - actuarial losses ​ $ 9.8 ​ $ 9.2 ​ ​ ​ ​ ​ ​ ​ ABO ​ $ 17.7 ​ $ 13.2 ​ 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 2020, 2021 and 2022 were recognized as components of our accumulated other comprehensive loss at December 31, 2019, 2020 and 2021 respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Interest cost ​ $ .6 ​ $ .5 ​ $ .4 Expected return on plan assets ​ (.6) ​ (.6) ​ (.6) Recognized actuarial losses ​ .6 ​ .6 ​ .6 Settlements ​ - ​ (.5) ​ - Total ​ $ .6 ​ $ - ​ $ .4 ​ 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, 2021 and 2022 are 2.6% and 5.3%, 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 2020, 2021 and 2022 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 2020 2021 2022 Discount rate 3.1% ​ 2.2% ​ 2.6% Long-term return on plan assets 4.5% ​ 4.0% ​ 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, 2021 and 2022 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 2021 and 2022. The table below details the changes in our consolidated other comprehensive income (loss) during 2020, 2021 and 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Changes in plan assets and benefit obligations recognized in ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year: ​ ​ ​ Net actuarial (losses) gains ​ $ (36.8) ​ $ 52.5 ​ $ 135.1 Amortization of unrecognized: ​ ​ ​ Net actuarial losses ​ 17.9 ​ 20.0 ​ 13.0 Prior service cost ​ .2 ​ .2 ​ .1 Settlement loss ​ ​ - ​ ​ - ​ ​ .3 Total ​ $ (18.7) ​ $ 72.7 ​ $ 148.5 ​ 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 10 - 20% to equity securities and 80 - 90% 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 7% , 4% , 6% and 4% , 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 34% 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 7% , 5% and 4% , respectively (before plan administrative expenses). Approximately 90% 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, 2021 and 2022 is shown in the tables below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at December 31, 2022 ​ ​ ​ ​ ​ 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 ​ $ 234.0 ​ $ - ​ $ - ​ $ 234.0 ​ $ - Canada: ​ ​ ​ ​ ​ Local currency equities ​ .1 ​ .1 ​ - ​ - ​ - Non local currency equities ​ 11.0 ​ 11.0 ​ - ​ - ​ - Local currency fixed income ​ 72.9 ​ 72.9 ​ - ​ - ​ - Cash and other ​ .6 ​ .6 ​ - ​ - ​ - Norway: ​ ​ ​ ​ ​ Local currency equities ​ 2.3 ​ 2.3 ​ - ​ - ​ - Non local currency equities ​ 4.7 ​ 4.7 ​ - ​ - ​ - Local currency fixed income ​ 21.8 ​ 7.0 ​ 14.8 ​ - ​ - Non local currency fixed income ​ 8.4 ​ 8.4 ​ - ​ - ​ - Real estate ​ 7.8 ​ - ​ - ​ 7.8 ​ - Cash and other ​ 2.7 ​ 2.4 ​ - ​ .3 ​ - U.S.: ​ ​ ​ ​ ​ Equities ​ 3.8 ​ .3 ​ - ​ - ​ 3.5 Fixed income ​ 7.0 ​ .1 ​ - ​ - ​ 6.9 Cash and other ​ 1.2 ​ .9 ​ - ​ - ​ .3 Other ​ 17.3 ​ .4 ​ - ​ 16.9 ​ - Total ​ $ 395.6 ​ $ 111.1 ​ $ 14.8 ​ $ 259.0 ​ $ 10.7 ​ A rollforward of the change in fair value of Level 3 assets follows. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Fair value at beginning of year ​ $ 314.3 ​ $ 310.3 Gain (loss) on assets held at end of year ​ 15.6 ​ (31.0) Gain (loss) on assets sold during the year ​ .4 ​ (.7) Assets purchased ​ 16.2 ​ 13.8 Assets sold ​ (14.8) ​ (14.9) Transfers in ​ ​ 3.5 ​ ​ - Currency exchange rate fluctuations ​ (24.9) ​ (18.5) Fair value at end of year ​ $ 310.3 ​ $ 259.0 ​

Other Noncurrent Liabilities

Other Noncurrent Liabilities	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Other Noncurrent Liabilities	Note 11 – Other noncurrent liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Accrued postretirement benefits ​ $ 8.4 ​ $ 5.9 Employee benefits ​ 6.1 ​ 4.8 Other ​ 13.5 ​ 9.8 Total ​ $ 28.0 ​ $ 20.5 ​

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Note 12 – Income taxes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Pre-tax income: ​ ​ ​ U.S. ​ $ 20.9 ​ $ 25.5 ​ $ 44.1 Non-U.S. ​ 59.1 ​ 127.9 ​ 89.8 Total ​ $ 80.0 ​ $ 153.4 ​ $ 133.9 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expected tax expense, at U.S. federal statutory ​ $ 16.8 ​ $ 32.2 ​ $ 28.1 Non-U.S. tax rates ​ .7 ​ 4.6 ​ 2.1 Incremental net tax benefit on earnings and losses of U.S. ​ (5.5) ​ (3.9) ​ (.5) Valuation allowance, net ​ .8 ​ 3.1 ​ (3.6) Global intangible low-tax income, net ​ 2.7 ​ 2.8 ​ 2.1 Tax rate changes ​ ​ (.3) ​ ​ - ​ ​ - Assessment (refund) of prior tax payments, net ​ ​ (.1) ​ ​ .1 ​ ​ - Adjustment to the reserve for uncertain tax positions, net ​ .1 ​ - ​ (.4) Nondeductible expenses ​ .9 ​ 1.0 ​ .9 U.S. state income taxes and other, net ​ - ​ .6 ​ .7 Income tax expense ​ $ 16.1 ​ $ 40.5 ​ $ 29.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Components of income tax expense: ​ ​ ​ Current payable: ​ ​ ​ U.S. federal and state ​ $ 4.8 ​ $ 4.6 ​ $ 10.7 Non-U.S. ​ 14.9 ​ 21.6 ​ 20.1 ​ ​ 19.7 ​ 26.2 ​ 30.8 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred income taxes (benefit): ​ ​ ​ U.S. federal and state ​ (2.6) ​ 3.3 ​ (3.0) Non-U.S. ​ (1.0) ​ 11.0 ​ 1.6 ​ ​ (3.6) ​ 14.3 ​ (1.4) Income tax expense ​ $ 16.1 ​ $ 40.5 ​ $ 29.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Comprehensive provision for income taxes allocable to: ​ ​ ​ Net income ​ $ 16.1 ​ $ 40.5 ​ $ 29.4 Other comprehensive income (loss): ​ ​ ​ Pension plans ​ ​ (6.0) ​ ​ 24.0 ​ ​ 49.3 OPEB plans ​ ​ (.2) ​ ​ - ​ ​ .4 Total ​ $ 9.9 ​ $ 64.5 ​ $ 79.1 ​ 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, 2021 and 2022 are summarized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2021 ​ 2022 ​ Assets Liabilities Assets Liabilities ​ ​ (In millions) Tax effect of temporary differences related to: ​ ​ ​ ​ Inventories ​ $ - ​ $ (2.9) ​ $ - ​ $ (5.5) Property and equipment ​ - ​ (62.5) ​ - ​ (59.1) Lease assets (liabilities) ​ 5.0 ​ (5.1) ​ 5.3 ​ (5.4) Accrued OPEB costs ​ 2.3 ​ - ​ 1.7 ​ - Accrued pension costs ​ 73.6 ​ - ​ 21.6 ​ - Other accrued liabilities and deductible differences ​ 12.1 ​ - ​ 15.3 ​ - Other taxable differences ​ - ​ (3.3) ​ - ​ (3.9) Tax on unremitted earnings of non-U.S. subsidiaries ​ - ​ (11.2) ​ - ​ (11.3) Tax loss and tax credit carryforwards ​ 78.1 ​ - ​ 70.7 ​ - Valuation allowance ​ (7.4) ​ - ​ (3.8) ​ - Adjusted gross deferred tax assets (liabilities) ​ 163.7 ​ (85.0) ​ 110.8 ​ (85.2) Netting by tax jurisdiction ​ (56.9) ​ 56.9 ​ (58.8) ​ 58.8 Net noncurrent deferred tax asset (liability) ​ $ 106.8 ​ $ (28.1) ​ $ 52.0 ​ $ (26.4) ​ We have substantial net operating loss (NOL) carryforwards in Germany (the equivalent of $414 million for German corporate tax purposes at December 31, 2022) and in Belgium (the equivalent of $13 million for Belgian corporate tax purposes at December 31, 2022). At December 31, 2022, 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, 2022, the balance of our unpaid Transition Tax is $44.7 million, which will be paid in annual installments over the remainder of the eight-year 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 2017 Tax Act limited our business interest expense to the sum of our business interest income and 30% of our adjusted taxable income as defined in the Tax Act. Any business interest expense disallowed as a deduction as a result of the limitation may be carried forward indefinitely. We determined our interest expense was limited under these provisions and we recorded deferred tax assets for the carryforwards associated with the nondeductible portion of our interest expense. We also concluded we were required to recognize a valuation allowance for such deferred tax asset under the more-likely-than-not recognition criteria. During 2022, we determined we were able to utilize a portion of the business interest expense carryforward and accordingly we recognized an aggregate non-cash income tax benefit of $3.5 million as a reduction of the valuation allowance. On August 16, 2022, the Inflation Reduction Act was signed into law. Among other things, this legislation provides for a 15% corporate alternative minimum tax on certain large corporations, imposes a 1% excise tax on qualifying stock buybacks occurring after December 31, 2022, and provides for certain energy-related tax credits. We have evaluated the relevant provisions of the Act and do not expect them to have a material impact on our tax provision. Tax authorities may in the future examine 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. 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 2020, 2021 and 2022 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 2020, 2021 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Changes in unrecognized tax benefits: ​ ​ ​ Unrecognized tax benefits at beginning of year ​ $ 3.9 ​ $ 4.1 ​ $ 3.8 Net increase (decrease): ​ ​ ​ Tax positions taken in prior periods ​ (.3) ​ - ​ - Tax positions taken in current period ​ .6 ​ .6 ​ .7 Lapse due to applicable statute of limitations ​ (.5) ​ (.7) ​ (1.1) Change in currency exchange rates ​ .4 ​ (.2) ​ (.2) Unrecognized tax benefits at end of year ​ $ 4.1 ​ $ 3.8 ​ $ 3.2 ​ At December 31, 2022, 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, 2022 was recognized, a benefit of $3.2 million would affect our effective income tax rate. We currently estimate that our unrecognized tax benefits will decrease by approximately $1.0 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 2019 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 2018 for Germany, 2019 for Belgium, 2017 for Canada and 2017 for Norway.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Stockholders' equity	Note 13 – Stockholders’ equity: Long-term incentive compensation plan Stock repurchase program Accumulated other comprehensive loss – ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Accumulated other comprehensive loss, net of tax: ​ ​ ​ Currency translation: ​ ​ ​ Balance at beginning of period ​ $ (246.8) ​ $ (233.4) ​ $ (240.4) Other comprehensive income (loss) ​ 13.4 ​ (7.0) ​ (28.8) Balance at end of period ​ $ (233.4) ​ $ (240.4) ​ $ (269.2) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Defined benefit pension plans: ​ ​ ​ Balance at beginning of period ​ $ (202.2) ​ $ (214.5) ​ $ (163.3) Other comprehensive income - amortization ​ 13.4 ​ 14.9 ​ 9.9 Net actuarial gain (loss) arising during year ​ ​ (25.7) ​ ​ 36.3 ​ ​ 90.3 Balance at end of period ​ $ (214.5) ​ $ (163.3) ​ $ (63.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPEB plans: ​ ​ ​ Balance at beginning of period ​ $ .2 ​ $ (.3) ​ $ (.4) Other comprehensive loss - amortization ​ (.2) ​ (.3) ​ (.3) Net actuarial gain (loss) arising during year ​ ​ (.3) ​ ​ .2 ​ ​ 1.5 Balance at end of period ​ $ (.3) ​ $ (.4) ​ $ .8 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total accumulated other comprehensive loss: ​ ​ ​ Balance at beginning of period ​ $ (448.8) ​ $ (448.2) ​ $ (404.1) Other comprehensive income ​ .6 ​ 44.1 ​ 72.6 Balance at end of period ​ $ (448.2) ​ $ (404.1) ​ $ (331.5) ​ 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, 2022
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, ​ 2021 2022 ​ ​ (In millions) Current receivables from affiliates: ​ ​ LPC ​ $ 15.8 ​ $ - Other ​ 2.6 ​ 2.7 ​ ​ $ 18.4 ​ $ 2.7 ​ ​ ​ ​ ​ ​ ​ Current payables to affiliates: ​ ​ LPC ​ $ 17.3 ​ $ 17.1 Income taxes payable to Valhi ​ .9 ​ 5.8 ​ ​ $ 18.2 ​ $ 22.9 ​ ​ ​ ​ ​ ​ ​ Noncurrent payable to affiliate - ​ ​ Income taxes payable to Valhi (See Note 12) ​ $ 44.7 ​ $ 33.5 ​ 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 2020 we entered into an unsecured revolving demand promissory note with Valhi under which as amended, we have agreed to loan Valhi up to $25 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, 2024. Loans made to Valhi at any time are at our discretion. At December 31, 2021 and December 31, 2022, we had no outstanding loans to Valhi under this promissory note. Interest income (including unused commitment fees) on our loan to Valhi was $.3 million in 2020 and $.2 million in each of 2021 and 2022. 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 $23.3 million in 2020, $24.0 million in 2021 and $24.5 million in 2022. Contran and certain of its subsidiaries and affiliates, including us, purchase certain of their insurance policies and risk management services as a group, with the costs of the jointly-owned policies and services being apportioned among the participating companies. Tall Pines Insurance Company (Tall Pines), a subsidiary of Valhi, underwrites certain insurance policies for Contran and certain of its subsidiaries and affiliates, including us. Tall Pines purchases reinsurance from highly rated (as determined by A. M. Best or another internationally recognized ratings agency) third-party insurance carriers for substantially all of the risks it underwrites. Consistent with insurance industry practices, Tall Pines receives commissions from the reinsurance underwriters and/or assesses fees for certain of the policies that it underwrites. During 2020, 2021 and 2022 we and our joint venture paid $19.1 million, $23.2 million and $20.8 million, respectively, under the group insurance program, which amounts principally represent insurance premiums, including $14.8 million, $18.6 million and $17.3 million, respectively, for policies written by Tall Pines. Amounts paid under the group insurance program also include payments to insurers or reinsurers 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 2023. 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 services program that Contran provides for primary data processing and failover. The program apportions its costs among the participating companies. The aggregate amount we paid Contran for such services was $.3 million in each of 2020, 2021 and 2022. Under the terms of a sublease agreement between Contran and us, we lease certain office space from Contran. We paid Contran $.4 million in both 2020 and 2021 and $.5 million in 2022 for such rent and related ancillary services. We expect that these relationships with Contran will continue in 2023.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 15 – Commitments and contingencies: Environmental matters Litigation matters Concentrations of credit risk 2 2 2 2 2 The table below shows the approximate percentage of our TiO 2 ​ ​ ​ ​ ​ ​ ​ ​ 2020 ​ 2021 ​ 2022 Europe 46% ​ 46% ​ 45% North America 36% ​ 37% ​ 39% ​ Long-term contracts 2 Income taxes

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2022
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, 2021 and 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 December 31, 2022 ​ ​ Carrying ​ Fair ​ Carrying ​ Fair ​ ​ amount ​ value ​ amount ​ value ​ ​ (In millions) Cash, cash equivalents and restricted cash ​ $ 412.6 ​ $ 412.6 ​ $ 334.6 ​ $ 334.6 Long-term debt - Fixed rate Senior Notes ​ 448.8 ​ 460.2 ​ 424.1 ​ 374.2 ​ At December 31, 2022, the estimated market price of our Senior Notes was €877 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.

Other operating income (expense

Other operating income (expense), net	12 Months Ended
	Dec. 31, 2022
Other operating income (expense), net:
Other operating income (expense), net:	Note 17 - Other operating income (expense), net: On August 24, 2020, LPC temporarily halted production due to Hurricane Laura. Although storm damage to core processing facilities was not extensive, a variety of factors, including loss of utilities and limited access and availability of employees and raw materials, prevented the resumption of operations until September 25, 2020. The majority of our losses from property damage and our share of LPC’s lost production and other costs resulting from the disruption of operations, were covered by insurance. We recognized a gain of $2.7 million related to our business interruption claim in the third quarter of 2022, which is included in Other operating income (expense) – Other income, net on our Consolidated Statement of Income.

Summary of significant accoun_2

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2022
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 –
Derivatives And Hedging Activities	Derivatives and hedging activities
Cash and Cash Equivalents	Cash and cash equivalents –
Restricted Cash	Restricted cash – the liability. To the extent the restricted amount does not relate to a recognized liability, we classify restricted cash as a current asset. Restricted cash classified as a current asset and restricted cash classified as a noncurrent asset are presented separately on our Consolidated Balance Sheets.
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 marketable equity securities are recognized in Other income (expense) - Marketable equity securities on our Consolidated Statements of Income. We accumulate unrealized gains and losses on marketable debt securities as part of accumulated other comprehensive income (loss), net of related deferred income taxes. 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 leases (in which leases with an original maturity of 12 months or less are excluded from the recognition requirements of ASC 842). 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 mine 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 –
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, 2022, 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 $112 million in 2020, $132 million in 2021 and $122 million in 2022.
Research and Development	We expense research and development costs as incurred, and these costs were $16 million in 2020, $17 million in 2021 and $15 million in 2022.
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 ​ ​ ​ ​ ​ ​ ​ ​ 2020 ​ 2021 ​ 2022 Europe 46% ​ 46% ​ 45% North America 36% ​ 37% ​ 39% ​

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022
Segments Geographical Areas [Abstract]
Net Sales and Property and Equipment by Geographical Information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Net sales - point of origin: ​ ​ ​ ​ ​ ​ ​ ​ ​ United States ​ $ 978.8 ​ $ 1,052.1 ​ $ 1,226.6 Germany ​ 836.0 ​ 971.7 ​ 895.4 Canada ​ 319.5 ​ 371.9 ​ 389.4 Belgium ​ 249.5 ​ 295.7 ​ 306.5 Norway ​ 211.8 ​ 257.2 ​ 273.5 Eliminations ​ (956.8) ​ (1,009.2) ​ (1,161.2) Total ​ $ 1,638.8 ​ $ 1,939.4 ​ $ 1,930.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net sales - point of destination: ​ ​ ​ Europe ​ $ 783.2 ​ $ 945.0 ​ $ 878.3 North America ​ 569.3 ​ 645.7 ​ 695.7 Other ​ 286.3 ​ 348.7 ​ 356.2 Total ​ $ 1,638.8 ​ $ 1,939.4 ​ $ 1,930.2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Identifiable assets - net property and equipment: ​ ​ Germany ​ $ 207.3 ​ $ 198.5 Belgium ​ 106.9 ​ 100.8 Canada ​ 90.5 ​ 87.8 Norway ​ 85.2 ​ 82.7 Other ​ 13.5 ​ 14.7 Total ​ $ 503.4 ​ $ 484.5

Accounts and Other Receivable_2

Accounts and Other Receivables, Net (Tables)	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Accounts and Other Receivables, Net	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Trade receivables ​ $ 326.3 ​ $ 220.3 Recoverable VAT and other receivables ​ 32.4 ​ 28.5 Refundable income taxes ​ 4.0 ​ 7.1 Allowance for doubtful accounts ​ (2.0) ​ (3.5) Total ​ $ 360.7 ​ $ 252.4

Inventories, Net (Tables)

Inventories, Net (Tables)	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Schedule of Inventories, Net	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Raw materials ​ $ 76.3 ​ $ 145.3 Work in process ​ 30.4 ​ 32.0 Finished products ​ 245.6 ​ 349.9 Supplies ​ 80.0 ​ 81.5 Total ​ $ 432.3 ​ $ 608.7

Investment in TiO2 Manufactur_2

Investment in TiO2 Manufacturing Joint Venture (Tables)	12 Months Ended
	Dec. 31, 2022
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, ​ 2020 2021 2022 ​ ​ (In millions) Distributions from LPC ​ $ 32.7 ​ $ 28.5 ​ $ 58.3 Contributions to LPC ​ (45.5) ​ (24.7) ​ (68.8) Net distributions (contributions) ​ $ (12.8) ​ $ 3.8 ​ $ (10.5) ​ Summary balance sheets of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) ASSETS ​ ​ ​ Current assets ​ $ 111.7 ​ $ 122.2 Property and equipment, net ​ 142.6 ​ 147.4 Total assets ​ $ 254.3 ​ $ 269.6 ​ ​ ​ ​ ​ ​ ​ LIABILITIES AND PARTNERS’ EQUITY ​ ​ Other liabilities, primarily current ​ $ 47.8 ​ $ 41.2 Partners’ equity ​ 206.5 ​ 228.4 Total liabilities and partners’ equity ​ $ 254.3 ​ $ 269.6 ​ Summary income statements of LPC are shown below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Revenues and other income: ​ ​ ​ ​ ​ ​ ​ ​ ​ Kronos ​ $ 167.8 ​ $ 188.6 ​ $ 225.6 Venator Investments ​ 168.3 ​ 189.6 ​ 225.9 Total revenues and other income ​ 336.1 ​ 378.2 ​ 451.5 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost and expenses: ​ ​ ​ Cost of sales ​ 335.7 ​ 377.8 ​ 451.1 General and administrative ​ .4 ​ .4 ​ .4 Total costs and expenses ​ 336.1 ​ 378.2 ​ 451.5 Net income ​ $ - ​ $ - ​ $ - ​

Marketable Securities (Tables)

Marketable Securities (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2021: ​ ​ ​ Valhi common stock 1 ​ $ 4.1 ​ $ 3.2 ​ $ .9 NL and CompX common stocks 1 ​ .1 ​ .1 ​ - Total ​ ​ ​ $ 4.2 ​ $ 3.3 ​ $ .9 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022: ​ ​ ​ ​ ​ Valhi common stock 1 ​ $ 3.2 ​ $ 3.2 ​ $ - ​

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Schedule of Future Minimum Payment under Non-Cancellable Operating Lease Liabilities	​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2023 ​ $ 4.5 2024 ​ 3.3 2025 ​ 2.7 2026 ​ 2.4 2027 ​ 1.5 2028 and thereafter ​ 17.0 Total remaining lease payments ​ 31.4 Less imputed interest ​ 10.2 Total lease obligations ​ 21.2 Less current obligations ​ 3.8 Long term lease obligations ​ $ 17.4 ​

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Components of Long Term Debt	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Kronos International, Inc. 3.75% Senior Notes ​ $ 448.8 ​ $ 424.1 Other ​ 2.4 ​ 1.1 Total debt ​ 451.2 ​ 425.2 Less current maturities ​ 1.4 ​ 1.1 Total long-term debt ​ $ 449.8 ​ $ 424.1 ​
Aggregate Maturities of Long-Term Debt and Other	​ ​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2023 ​ $ 1.1 2024 ​ - 2025 ​ 426.5 2026 ​ - 2027 ​ - 2028 and thereafter ​ - Gross maturities ​ 427.6 Less debt issuance costs ​ 2.4 Total ​ $ 425.2 ​

Accounts Payable and Accrued _2

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Payables And Accruals [Abstract]
Components of Accounts Payable and Accrued Liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Accounts payable ​ $ 143.6 ​ $ 177.2 Accrued sales discounts and rebates ​ 28.7 ​ 25.6 Employee benefits ​ 28.9 ​ 22.9 Operating lease liabilities ​ 3.7 ​ 3.8 Other ​ 52.0 ​ 59.9 Total ​ $ 256.9 ​ $ 289.4

Defined contribution and defi_2

Defined contribution and defined benefit retirement plans (Tables)	12 Months Ended
	Dec. 31, 2022
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, ​ 2021 2022 ​ ​ (In millions) Change in projected benefit obligations (PBO): ​ ​ Benefit obligations at beginning of the year ​ $ 846.7 ​ $ 748.1 Service cost ​ 14.7 ​ 11.3 Interest cost ​ 8.2 ​ 10.5 Participant contributions ​ 2.0 ​ 1.7 Actuarial gains ​ (45.4) ​ (195.8) Settlements ​ - ​ (1.2) Change in currency exchange rates ​ (55.0) ​ (50.3) Benefits paid ​ (23.1) ​ (21.5) Benefit obligations at end of the year ​ 748.1 ​ 502.8 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 481.8 ​ 470.1 Actual return on plan assets ​ 17.7 ​ (49.5) Employer contributions ​ 18.7 ​ 15.0 Participant contributions ​ 2.0 ​ 1.7 Settlements ​ - ​ (1.2) Change in currency exchange rates ​ (27.0) ​ (31.0) Benefits paid ​ (23.1) ​ (21.5) Fair value of plan assets at end of year ​ 470.1 ​ 383.6 Funded status ​ $ (278.0) ​ $ (119.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Noncurrent pension asset ​ $ 7.6 ​ $ 8.2 Noncurrent accrued pension costs ​ (285.6) ​ (127.4) Total ​ $ (278.0) ​ $ (119.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss: ​ ​ Actuarial losses ​ $ 233.3 ​ $ 85.4 Prior service cost ​ .4 ​ .4 Total ​ $ 233.7 ​ $ 85.8 ​ ​ ​ ​ ​ ​ ​ Accumulated benefit obligations (ABO) ​ $ 723.7 ​ $ 488.0 ​ The funded status of our U.S. defined benefit pension plan is presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Change in PBO: ​ ​ Benefit obligations at beginning of the year ​ $ 19.4 ​ $ 17.7 Interest cost ​ .5 ​ .4 Actuarial gains ​ (.6) ​ (3.9) Settlements ​ ​ (.5) ​ ​ - Benefits paid ​ (1.1) ​ (1.0) Benefit obligations at end of the year ​ 17.7 ​ 13.2 ​ ​ ​ ​ ​ ​ ​ Change in plan assets: ​ ​ Fair value of plan assets at beginning of the year ​ 16.1 ​ 15.9 Actual return on plan assets ​ .5 ​ (3.2) Employer contributions ​ .4 ​ .3 Benefits paid ​ (1.1) ​ (1.0) Fair value of plan assets at end of year ​ 15.9 ​ 12.0 Funded status ​ $ (1.8) ​ $ (1.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in the balance sheet: ​ ​ Accrued pension costs: ​ ​ Current ​ $ - ​ $ - Noncurrent ​ (1.8) ​ (1.2) Total ​ $ (1.8) ​ $ (1.2) ​ ​ ​ ​ ​ ​ ​ Amounts recognized in accumulated other comprehensive loss - actuarial losses ​ $ 9.8 ​ $ 9.2 ​ ​ ​ ​ ​ ​ ​ ABO ​ $ 17.7 ​ $ 13.2 ​
Components of Net Periodic Benefit Cost	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 2020, 2021 and 2022 were recognized as components of our accumulated other comprehensive loss at December 31, 2019, 2020 and 2021, respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Service cost $ 13.3 ​ $ 14.7 ​ $ 11.3 Interest cost 10.0 ​ 8.2 ​ 10.5 Expected return on plan assets (8.7) ​ (11.2) ​ (11.0) Amortization of prior service cost ​ .2 ​ ​ .2 ​ ​ .1 Recognized actuarial losses 17.3 ​ 19.4 ​ 12.5 Settlements ​ - ​ ​ - ​ ​ .3 Total $ 32.1 ​ $ 31.3 ​ $ 23.7 ​ 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 2020, 2021 and 2022 were recognized as components of our accumulated other comprehensive loss at December 31, 2019, 2020 and 2021 respectively, net of deferred income taxes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Net periodic pension cost (income): ​ ​ ​ Interest cost ​ $ .6 ​ $ .5 ​ $ .4 Expected return on plan assets ​ (.6) ​ (.6) ​ (.6) Recognized actuarial losses ​ .6 ​ .6 ​ .6 Settlements ​ - ​ (.5) ​ - Total ​ $ .6 ​ $ - ​ $ .4 ​
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, ​ 2021 2022 ​ ​ (In millions) Plans for which the ABO exceeds plan assets: ​ ​ PBO ​ $ 695.2 ​ $ 403.5 ABO ​ 674.4 ​ 392.4 Fair value of plan assets ​ 409.4 ​ 276.0 ​
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, 2021 and 2022 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ December 31, Rate 2021 2022 Discount rate 1.5% ​ 3.9% Increase in future compensation levels 2.6% ​ 2.7% ​ The weighted-average rate assumptions used in determining the net periodic pension cost for our non-U.S. defined benefit pension plans for 2020, 2021 and 2022 are presented in the table below. ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, Rate 2020 2021 2022 Discount rate 1.4% ​ 1.0% ​ 1.5% Increase in future compensation levels 2.6% ​ 2.6% ​ 2.6% Long-term return on plan assets 2.0% ​ 2.4% ​ 2.5% ​ The weighted-average rate assumptions used in determining the net periodic pension cost for our U.S. defined benefit pension plan for 2020, 2021 and 2022 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 2020 2021 2022 Discount rate 3.1% ​ 2.2% ​ 2.6% Long-term return on plan assets 4.5% ​ 4.0% ​ 4.0% ​
Pension Plans Defined Benefit [Member]
Benefit Payments	​ ​ ​ ​ Years ending December 31, Amount ​ ​ (In millions) 2023 ​ $ 23.0 2024 ​ 24.7 2025 ​ 25.1 2026 ​ 26.4 2027 ​ 28.5 Next 5 years ​ 158.7
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 2020, 2021 and 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Changes in plan assets and benefit obligations recognized in ​ ​ ​ ​ ​ ​ ​ ​ ​ Current year: ​ ​ ​ Net actuarial (losses) gains ​ $ (36.8) ​ $ 52.5 ​ $ 135.1 Amortization of unrecognized: ​ ​ ​ Net actuarial losses ​ 17.9 ​ 20.0 ​ 13.0 Prior service cost ​ .2 ​ .2 ​ .1 Settlement loss ​ ​ - ​ ​ - ​ ​ .3 Total ​ $ (18.7) ​ $ 72.7 ​ $ 148.5 ​
Composition of Pension Plan Assets	The composition of our pension plan assets by asset category and fair value level at December 31, 2021 and 2022 is shown in the tables below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements at December 31, 2022 ​ ​ ​ ​ ​ 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 ​ $ 234.0 ​ $ - ​ $ - ​ $ 234.0 ​ $ - Canada: ​ ​ ​ ​ ​ Local currency equities ​ .1 ​ .1 ​ - ​ - ​ - Non local currency equities ​ 11.0 ​ 11.0 ​ - ​ - ​ - Local currency fixed income ​ 72.9 ​ 72.9 ​ - ​ - ​ - Cash and other ​ .6 ​ .6 ​ - ​ - ​ - Norway: ​ ​ ​ ​ ​ Local currency equities ​ 2.3 ​ 2.3 ​ - ​ - ​ - Non local currency equities ​ 4.7 ​ 4.7 ​ - ​ - ​ - Local currency fixed income ​ 21.8 ​ 7.0 ​ 14.8 ​ - ​ - Non local currency fixed income ​ 8.4 ​ 8.4 ​ - ​ - ​ - Real estate ​ 7.8 ​ - ​ - ​ 7.8 ​ - Cash and other ​ 2.7 ​ 2.4 ​ - ​ .3 ​ - U.S.: ​ ​ ​ ​ ​ Equities ​ 3.8 ​ .3 ​ - ​ - ​ 3.5 Fixed income ​ 7.0 ​ .1 ​ - ​ - ​ 6.9 Cash and other ​ 1.2 ​ .9 ​ - ​ - ​ .3 Other ​ 17.3 ​ .4 ​ - ​ 16.9 ​ - Total ​ $ 395.6 ​ $ 111.1 ​ $ 14.8 ​ $ 259.0 ​ $ 10.7
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, ​ 2021 2022 ​ ​ (In millions) Fair value at beginning of year ​ $ 314.3 ​ $ 310.3 Gain (loss) on assets held at end of year ​ 15.6 ​ (31.0) Gain (loss) on assets sold during the year ​ .4 ​ (.7) Assets purchased ​ 16.2 ​ 13.8 Assets sold ​ (14.8) ​ (14.9) Transfers in ​ ​ 3.5 ​ ​ - Currency exchange rate fluctuations ​ (24.9) ​ (18.5) Fair value at end of year ​ $ 310.3 ​ $ 259.0

Other Noncurrent Liabilities (T

Other Noncurrent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Components of Other Noncurrent Liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ 2021 2022 ​ ​ (In millions) Accrued postretirement benefits ​ $ 8.4 ​ $ 5.9 Employee benefits ​ 6.1 ​ 4.8 Other ​ 13.5 ​ 9.8 Total ​ $ 28.0 ​ $ 20.5

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Pre-tax income: ​ ​ ​ U.S. ​ $ 20.9 ​ $ 25.5 ​ $ 44.1 Non-U.S. ​ 59.1 ​ 127.9 ​ 89.8 Total ​ $ 80.0 ​ $ 153.4 ​ $ 133.9 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expected tax expense, at U.S. federal statutory ​ $ 16.8 ​ $ 32.2 ​ $ 28.1 Non-U.S. tax rates ​ .7 ​ 4.6 ​ 2.1 Incremental net tax benefit on earnings and losses of U.S. ​ (5.5) ​ (3.9) ​ (.5) Valuation allowance, net ​ .8 ​ 3.1 ​ (3.6) Global intangible low-tax income, net ​ 2.7 ​ 2.8 ​ 2.1 Tax rate changes ​ ​ (.3) ​ ​ - ​ ​ - Assessment (refund) of prior tax payments, net ​ ​ (.1) ​ ​ .1 ​ ​ - Adjustment to the reserve for uncertain tax positions, net ​ .1 ​ - ​ (.4) Nondeductible expenses ​ .9 ​ 1.0 ​ .9 U.S. state income taxes and other, net ​ - ​ .6 ​ .7 Income tax expense ​ $ 16.1 ​ $ 40.5 ​ $ 29.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Components of income tax expense: ​ ​ ​ Current payable: ​ ​ ​ U.S. federal and state ​ $ 4.8 ​ $ 4.6 ​ $ 10.7 Non-U.S. ​ 14.9 ​ 21.6 ​ 20.1 ​ ​ 19.7 ​ 26.2 ​ 30.8 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred income taxes (benefit): ​ ​ ​ U.S. federal and state ​ (2.6) ​ 3.3 ​ (3.0) Non-U.S. ​ (1.0) ​ 11.0 ​ 1.6 ​ ​ (3.6) ​ 14.3 ​ (1.4) Income tax expense ​ $ 16.1 ​ $ 40.5 ​ $ 29.4 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Comprehensive provision for income taxes allocable to: ​ ​ ​ Net income ​ $ 16.1 ​ $ 40.5 ​ $ 29.4 Other comprehensive income (loss): ​ ​ ​ Pension plans ​ ​ (6.0) ​ ​ 24.0 ​ ​ 49.3 OPEB plans ​ ​ (.2) ​ ​ - ​ ​ .4 Total ​ $ 9.9 ​ $ 64.5 ​ $ 79.1 ​
Components of Net Deferred Income Taxes	The components of our net deferred income taxes at December 31, 2021 and 2022 are summarized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, ​ ​ 2021 ​ 2022 ​ Assets Liabilities Assets Liabilities ​ ​ (In millions) Tax effect of temporary differences related to: ​ ​ ​ ​ Inventories ​ $ - ​ $ (2.9) ​ $ - ​ $ (5.5) Property and equipment ​ - ​ (62.5) ​ - ​ (59.1) Lease assets (liabilities) ​ 5.0 ​ (5.1) ​ 5.3 ​ (5.4) Accrued OPEB costs ​ 2.3 ​ - ​ 1.7 ​ - Accrued pension costs ​ 73.6 ​ - ​ 21.6 ​ - Other accrued liabilities and deductible differences ​ 12.1 ​ - ​ 15.3 ​ - Other taxable differences ​ - ​ (3.3) ​ - ​ (3.9) Tax on unremitted earnings of non-U.S. subsidiaries ​ - ​ (11.2) ​ - ​ (11.3) Tax loss and tax credit carryforwards ​ 78.1 ​ - ​ 70.7 ​ - Valuation allowance ​ (7.4) ​ - ​ (3.8) ​ - Adjusted gross deferred tax assets (liabilities) ​ 163.7 ​ (85.0) ​ 110.8 ​ (85.2) Netting by tax jurisdiction ​ (56.9) ​ 56.9 ​ (58.8) ​ 58.8 Net noncurrent deferred tax asset (liability) ​ $ 106.8 ​ $ (28.1) ​ $ 52.0 ​ $ (26.4) ​
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 2020, 2021 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Changes in unrecognized tax benefits: ​ ​ ​ Unrecognized tax benefits at beginning of year ​ $ 3.9 ​ $ 4.1 ​ $ 3.8 Net increase (decrease): ​ ​ ​ Tax positions taken in prior periods ​ (.3) ​ - ​ - Tax positions taken in current period ​ .6 ​ .6 ​ .7 Lapse due to applicable statute of limitations ​ (.5) ​ (.7) ​ (1.1) Change in currency exchange rates ​ .4 ​ (.2) ​ (.2) Unrecognized tax benefits at end of year ​ $ 4.1 ​ $ 3.8 ​ $ 3.2 ​

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss	Accumulated other comprehensive loss – ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Years ended December 31, ​ 2020 2021 2022 ​ ​ (In millions) Accumulated other comprehensive loss, net of tax: ​ ​ ​ Currency translation: ​ ​ ​ Balance at beginning of period ​ $ (246.8) ​ $ (233.4) ​ $ (240.4) Other comprehensive income (loss) ​ 13.4 ​ (7.0) ​ (28.8) Balance at end of period ​ $ (233.4) ​ $ (240.4) ​ $ (269.2) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Defined benefit pension plans: ​ ​ ​ Balance at beginning of period ​ $ (202.2) ​ $ (214.5) ​ $ (163.3) Other comprehensive income - amortization ​ 13.4 ​ 14.9 ​ 9.9 Net actuarial gain (loss) arising during year ​ ​ (25.7) ​ ​ 36.3 ​ ​ 90.3 Balance at end of period ​ $ (214.5) ​ $ (163.3) ​ $ (63.1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OPEB plans: ​ ​ ​ Balance at beginning of period ​ $ .2 ​ $ (.3) ​ $ (.4) Other comprehensive loss - amortization ​ (.2) ​ (.3) ​ (.3) Net actuarial gain (loss) arising during year ​ ​ (.3) ​ ​ .2 ​ ​ 1.5 Balance at end of period ​ $ (.3) ​ $ (.4) ​ $ .8 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total accumulated other comprehensive loss: ​ ​ ​ Balance at beginning of period ​ $ (448.8) ​ $ (448.2) ​ $ (404.1) Other comprehensive income ​ .6 ​ 44.1 ​ 72.6 Balance at end of period ​ $ (448.2) ​ $ (404.1) ​ $ (331.5) ​

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2022
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, ​ 2021 2022 ​ ​ (In millions) Current receivables from affiliates: ​ ​ LPC ​ $ 15.8 ​ $ - Other ​ 2.6 ​ 2.7 ​ ​ $ 18.4 ​ $ 2.7 ​ ​ ​ ​ ​ ​ ​ Current payables to affiliates: ​ ​ LPC ​ $ 17.3 ​ $ 17.1 Income taxes payable to Valhi ​ .9 ​ 5.8 ​ ​ $ 18.2 ​ $ 22.9 ​ ​ ​ ​ ​ ​ ​ Noncurrent payable to affiliate - ​ ​ Income taxes payable to Valhi (See Note 12) ​ $ 44.7 ​ $ 33.5 ​

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
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 ​ ​ ​ ​ ​ ​ ​ ​ 2020 ​ 2021 ​ 2022 Europe 46% ​ 46% ​ 45% North America 36% ​ 37% ​ 39% ​

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization And Basis Of Presentation [Line Items]
Cost of sales	$ 1,539.1	$ 1,493.2	$ 1,287.6
Income taxes paid, net	37.3	41.6	15.3
Capitalized interest costs	1.2	1.1	0.5
Research and development costs	15	17	16
Shipping and Handling
Organization And Basis Of Presentation [Line Items]
Cost of sales	$ 122	132	112
Louisiana Pigment Company, L.P.
Organization And Basis Of Presentation [Line Items]
Owned manufacturing joint venture	50%
Valhi Inc
Organization And Basis Of Presentation [Line Items]
Income taxes paid, net	$ 15.9	$ 17.6	$ 6.6
Valhi Inc | Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	50%
Valhi Inc | NL Industries Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage in company	83%
NL Industries Inc. | Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	31%
Contran
Organization And Basis Of Presentation [Line Items]
Controlling interest description	Consequently, at December 31, 2022, 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%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2022
Buildings and improvements | Minimum [Member]
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	10 years
Buildings and improvements | Maximum [Member]
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	40 years
Machinery and equipment | Minimum [Member]
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	3 years
Machinery and equipment | Maximum [Member]
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, 2022	Dec. 31, 2021
Non-U.S. Subsidiaries
Geographic Information [Line Items]
Net assets of non-US subsidiaries	$ 504	$ 338

Geographic Information - Net Sa

Geographic Information - Net Sales and Property and Equipment by Geographical Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 1,930.2	$ 1,939.4	$ 1,638.8
Net property and equipment	484.5	503.4
D E
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	198.5	207.3
C A
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	87.8	90.5
B E
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	100.8	106.9
N O
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	82.7	85.2
Other Geographical Area [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net property and equipment	14.7	13.5
Point Of Origin [Member] | Reportable Geographical Components [Member] | D E
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	895.4	971.7	836
Point Of Origin [Member] | Reportable Geographical Components [Member] | U S
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	1,226.6	1,052.1	978.8
Point Of Origin [Member] | Reportable Geographical Components [Member] | C A
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	389.4	371.9	319.5
Point Of Origin [Member] | Reportable Geographical Components [Member] | B E
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	306.5	295.7	249.5
Point Of Origin [Member] | Reportable Geographical Components [Member] | N O
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	273.5	257.2	211.8
Point Of Origin [Member] | Geography Eliminations [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	(1,161.2)	(1,009.2)	(956.8)
Point Of Destination [Member] | Europe [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	878.3	945	783.2
Point Of Destination [Member] | North America [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	695.7	645.7	569.3
Point Of Destination [Member] | Other Geographical Area [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 356.2	$ 348.7	$ 286.3

Accounts and Other Receivable_3

Accounts and Other Receivables, Net - Accounts and Other Receivables, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Receivables from affiliates	$ 2.7	$ 18.4
Allowance for doubtful accounts	(3.5)	(2)
Total	252.4	360.7
Trade receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	220.3	326.3
Recoverable VAT and other receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts and other receivables	28.5	32.4
Refundable income taxes
Accounts Notes And Loans Receivable [Line Items]
Refundable income taxes	$ 7.1	$ 4

Inventories, Net - Schedule of

Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 145.3	$ 76.3
Work in process	32	30.4
Finished products	349.9	245.6
Supplies	81.5	80
Total	$ 608.7	$ 432.3

Investment in TiO2 Manufactur_3

Investment in TiO2 Manufacturing Joint Venture - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022 USD ($)
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%
Venator Materials PLC
Schedule of Equity Method Investments [Line Items]
Equity interest in LPC	50%
Louisiana Pigment Company, L.P.
Schedule of Equity Method Investments [Line Items]
Products purchased from plant	50%
Venator Materials PLC | Venator Group
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage owned by parent	100%

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Net distributions (contributions)	$ (10.5)	$ 3.8	$ (12.8)
Louisiana Pigment Company, L.P.
Schedule of Equity Method Investments [Line Items]
Distributions from LPC	58.3	28.5	32.7
Contributions to LPC	(68.8)	(24.7)	(45.5)
Net distributions (contributions)	$ (10.5)	$ 3.8	$ (12.8)

Investment in TiO2 Manufactur_5

Investment in TiO2 Manufacturing Joint Venture - Summary of Balance Sheets of LPC (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
ASSETS
Current assets	$ 1,242.2	$ 1,258
Property and equipment, net	484.5	503.4
Total assets	1,934.4	2,012.8
LIABILITIES AND STOCKHOLDERS' EQUITY
Total liabilities and stockholders' equity	1,934.4	2,012.8
Louisiana Pigment Company, L.P.
ASSETS
Current assets	122.2	111.7
Property and equipment, net	147.4	142.6
Total assets	269.6	254.3
LIABILITIES AND STOCKHOLDERS' EQUITY
Other liabilities, primarily current	41.2	47.8
Partners' equity	228.4	206.5
Total liabilities and stockholders' equity	$ 269.6	$ 254.3

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Cost and expenses:
Net income	$ 104.5	$ 112.9	$ 63.9
Louisiana Pigment Company, L.P.
Revenues and other income:
Total revenues and other income	451.5	378.2	336.1
Cost and expenses:
Cost of sales	451.1	377.8	335.7
General and administrative	0.4	0.4	0.4
Total costs and expenses	451.5	378.2	336.1
Louisiana Pigment Company, L.P. | Kronos
Revenues and other income:
Total revenues and other income	225.6	188.6	167.8
Louisiana Pigment Company, L.P. | Venator Investments LLC
Revenues and other income:
Total revenues and other income	$ 225.9	$ 189.6	$ 168.3

Marketable Securities - Classif

Marketable Securities - Classification of Marketable Securities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022
Marketable Securities [Line Items]
Market value	$ 4.2	$ 3.2
Cost basis	3.3
Unrealized gain (loss)	0.9
Level 1 | Common stock | Valhi
Marketable Securities [Line Items]
Market value	4.1	3.2
Cost basis	3.2	$ 3.2
Unrealized gain (loss)	0.9
Level 1 | Common stock | NL And CompX
Marketable Securities [Line Items]
Market value	0.1
Cost basis	$ 0.1

Marketable Securities - Additio

Marketable Securities - Additional Information (Detail) - Common stock - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
NL And CompX
Marketable Securities [Line Items]
Sale of NL and CompX common stock	$ 0.1
Valhi Inc
Marketable Securities [Line Items]
Investments in publicly-traded shares			144,000
Quoted market price of per share		$ 22	$ 28.75

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Operating lease payment	$ 5.5	$ 7.7	$ 7.6
Operating lease, expense	5.5	$ 7.7	7.6
Operating lease, liability	$ 21.2
Operating lease, weighted average remaining lease term	15 years	17 years
Operating lease, weighted average discount rate	5%	5%
New Operating Leases
Lessee Lease Description [Line Items]
Operating lease, liability	$ 6.6	$ 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%
Operating lease, liability	$ 7.2

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Payment under Non-Cancellable Operating Lease Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
2023	$ 4.5
2024	3.3
2025	2.7
2026	2.4
2027	1.5
2028 and thereafter	17
Total remaining lease payments	31.4
Less imputed interest	10.2
Total lease obligations	21.2
Operating lease liabilities	$ 3.8	$ 3.7
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	$ 17.4	$ 15.8

Long-Term Debt - Components of

Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Notes	$ 424.1	$ 448.8
Other	1.1	2.4
Total debt	425.2	451.2
Less current maturities	1.1	1.4
Total long-term debt	424.1	449.8
Kronos International, Inc | 3.75% Senior Notes
Debt Instrument [Line Items]
Kronos International, Inc. 3.75% Senior Notes	$ 424.1	$ 448.8

Long-Term Debt - Senior Notes -

Long-Term Debt - Senior Notes - Additional Information (Detail) € in Millions, $ in Millions			12 Months Ended
	Sep. 13, 2017 USD ($)	Sep. 13, 2017 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 13, 2017 EUR (€)
Debt Instrument [Line Items]
Aggregate principal amount outstanding			$ 424.1	$ 448.8
Senior Notes [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 2.4	$ 3.5
Minimum amount of debt default for using customary default provisions	$ 50
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Debt instrument interest rate	3.75%	3.75%	3.75%	3.75%	3.75%
Debt instrument maturity date	Sep. 15, 2025
Aggregate principal amount outstanding			$ 424.1	$ 448.8
Debt instrument principal amount	$ 477.6	$ 477.6			€ 400
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 100.938% 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%
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%	100%			100%
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%	65%			65%
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%	100%			100%
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	100.938%
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%

Long-Term Debt - Revolving Cred

Long-Term Debt - Revolving Credit Facilities - Additional Information (Detail) - Global Revolver € in Millions, $ in Millions, $ in Millions		12 Months Ended
	Apr. 20, 2021 USD ($)	Dec. 31, 2022 USD ($)	Apr. 20, 2021 CAD ($)	Apr. 20, 2021 EUR (€)
Debt Instrument [Line Items]
Repayments of lines of credit		$ 0
Borrowings under credit facility during the period		0
Maximum borrowing capacity	$ 225
Amount available for Borrowing		$ 211
Line of Credit Maturity	2026-04
Fixed charge coverage ratio, minimum value	100%
Non Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	1.50%
Non Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	2%
Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	0.50%
Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	2%
Canadian Subsidiary Revolving Borrowings Maximum
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 25
Belgian Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity | €				€ 30
German Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity | €				€ 60

-Long-Term Debt - Aggregate Mat

-Long-Term Debt - Aggregate Maturities of Long-Term Debt and Other (Detail) $ in Millions	Dec. 31, 2022 USD ($)
Long Term Debt By Maturity [Abstract]
2023	$ 1.1
2025	426.5
Gross maturities	427.6
Less debt issuance costs	2.4
Total	$ 425.2

Accounts Payable and Accrued _3

Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts Payable And Accrued Liabilities [Line Items]
Accounts payable	$ 177.2	$ 143.6
Accrued sales discounts and rebates	25.6	28.7
Employee benefits	22.9	28.9
Current payable to affiliate	22.9	18.2
Operating lease liabilities	$ 3.8	$ 3.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other	$ 59.9	$ 52
Total	$ 289.4	$ 256.9

Defined Contribution and Defi_3

Defined Contribution and Defined Benefit Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution benefit plan expense	$ 3.9	$ 3.9	$ 3.4
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions next fiscal year	17
Pension Plans Defined Benefit [Member] | U S
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan	$ 1.2	$ 1.8
Discount rate	5.30%	2.60%
Expected long-term rate of return	4%	4%	4.50%
Pension Plans Defined Benefit [Member] | U S | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7%
Target asset allocation	34%
Pension Plans Defined Benefit [Member] | U S | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	5%
Target asset allocation	59%
Pension Plans Defined Benefit [Member] | U S | Multi-asset Strategies and CMRT
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	4%
Pension Plans Defined Benefit [Member] | U S | Assets valued at NAV
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	90%
Pension Plans Defined Benefit [Member] | Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan	$ 119.2	$ 278
Discount rate	3.90%	1.50%
Expected long-term rate of return	2.50%	2.40%	2%
Pension Plans Defined Benefit [Member] | C A | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	80%
Pension Plans Defined Benefit [Member] | C A | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	90%
Pension Plans Defined Benefit [Member] | C A | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	10%
Pension Plans Defined Benefit [Member] | C A | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	20%
Pension Plans Defined Benefit [Member] | N O | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7%
Target asset allocation	15%
Pension Plans Defined Benefit [Member] | N O | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	4%
Target asset allocation	62%
Pension Plans Defined Benefit [Member] | N O | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	6%
Target asset allocation	14%
Pension Plans Defined Benefit [Member] | N O | Other Investment Securities And Cash
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	4%
Pension Plans Defined Benefit [Member] | N O | Real Estate And Other Investments
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation	17%

Defined Contribution and Defi_4

Defined Contribution and Defined Benefit Retirement Plans- Benefit Payments (Detail) - Pension Plans Defined Benefit [Member] $ in Millions	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2023	$ 23
2024	24.7
2025	25.1
2026	26.4
2027	28.5
Next 5 years	$ 158.7

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Amounts recognized in the balance sheet:
Accrued pension costs, noncurrent	$ (128.6)	$ (287.4)
Pension Plans Defined Benefit [Member]
Change in plan assets:
Fair value of plan assets at beginning of the year	486
Fair value of plan assets at end of year	395.6	486
U S | Pension Plans Defined Benefit [Member]
Change in projected benefit obligations (PBO):
Benefit obligations at beginning of the year	17.7	19.4
Interest cost	0.4	0.5	$ 0.6
Actuarial losses (gains)	(3.9)	(0.6)
Settlements		(0.5)
Benefits paid	(1)	(1.1)
Benefit obligations at end of the year	13.2	17.7	19.4
Change in plan assets:
Fair value of plan assets at beginning of the year	15.9	16.1
Actual return on plan assets	(3.2)	0.5
Employer contributions	0.3	0.4
Settlements		(0.5)
Benefits paid	(1)	(1.1)
Fair value of plan assets at end of year	12	15.9	16.1
Funded status	(1.2)	(1.8)
Amounts recognized in the balance sheet:
Accrued pension costs, noncurrent	(1.2)	(1.8)
Total	(1.2)	(1.8)
Amount recognized in accumulated other comprehensive loss, Actuarial losses	9.2	9.8
Accumulated benefit obligations (ABO)	13.2	17.7
Foreign Pension Plans Defined Benefit | Pension Plans Defined Benefit [Member]
Change in projected benefit obligations (PBO):
Benefit obligations at beginning of the year	748.1	846.7
Service cost	11.3	14.7	13.3
Interest cost	10.5	8.2	10
Participant contributions	1.7	2
Actuarial losses (gains)	(195.8)	(45.4)
Settlements	(1.2)
Change in currency exchange rates	(50.3)	(55)
Benefits paid	(21.5)	(23.1)
Benefit obligations at end of the year	502.8	748.1	846.7
Change in plan assets:
Fair value of plan assets at beginning of the year	470.1	481.8
Actual return on plan assets	(49.5)	17.7
Employer contributions	15	18.7
Participant contributions	1.7	2
Settlements	(0.3)
Change in currency exchange rates	(31)	(27)
Benefits paid	(21.5)	(23.1)
Fair value of plan assets at end of year	383.6	470.1	$ 481.8
Funded status	(119.2)	(278)
Amounts recognized in the balance sheet:
Noncurrent pension asset	8.2	7.6
Accrued pension costs, noncurrent	(127.4)	(285.6)
Total	(119.2)	(278)
Amount recognized in accumulated other comprehensive loss, Actuarial losses	85.4	233.3
Amount recognized in accumulated other comprehensive loss, Prior service cost	0.4	0.4
Amount recognized in accumulated other comprehensive loss, Total	85.8	233.7
Accumulated benefit obligations (ABO)	$ 488	$ 723.7

Defined Contribution and Defi_6

Defined Contribution and Defined Benefit Retirement Plans - Components of Net Periodic Benefit Cost (Detail) - Defined benefit pension plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11.3	$ 14.7	$ 13.3
Interest cost	10.5	8.2	10
Expected return on plan assets	(11)	(11.2)	(8.7)
Amortization of prior service cost	0.1	0.2	0.2
Recognized actuarial losses	12.5	19.4	17.3
Settlements	(0.3)
Total	23.7	31.3	32.1
U S
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.4	0.5	0.6
Expected return on plan assets	(0.6)	(0.6)	(0.6)
Recognized actuarial losses	0.6	0.6	0.6
Settlements		$ (0.5)
Total	$ 0.4		$ 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 - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation (PBO)	$ 403.5	$ 695.2
Accumulated Benefit Obligation (ABO)	392.4	674.4
Fair value of plan assets	$ 276	$ 409.4

Defined Contribution and Defi_8

Defined Contribution and Defined Benefit Retirement Plans - Schedule of Assumptions Used (Detail) - Foreign Pension Plans Defined Benefit - Pension Plans Defined Benefit [Member]	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	1.50%
Increase in future compensation levels	2.70%	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) - Pension Plans Defined Benefit [Member]	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.50%	1%	1.40%
Increase in future compensation levels	2.60%	2.60%	2.60%
Long-term return on plan assets	2.50%	2.40%	2%
U S
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.60%	2.20%	3.10%
Long-term return on plan assets	4%	4%	4.50%

Defined Contribution and Def_10

Defined Contribution and Defined Benefit Retirement Plans - Changes In Benefit Obligations Recognized In Accumulated Other Comprehensive Income (Loss) (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (losses) gains	$ 135.1	$ 52.5	$ (36.8)
Net actuarial losses	13	20	17.9
Prior service cost	0.1	0.2	0.2
Settlement loss	0.3
Total	$ 148.5	$ 72.7	$ (18.7)

Defined Contribution and Def_11

Defined Contribution and Defined Benefit Retirement Plans - Composition of Pension Plan Assets (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 395.6	$ 486
Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	383.6	470.1	$ 481.8
D E
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	234	282.9
Other.
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	17.3	18.1
U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	12	15.9	$ 16.1
Fair Value Inputs Level1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	111.1	151.6
Fair Value Inputs Level1 [Member] | Other.
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.4	0.4
Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	14.8	9.2
Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	259	310.3
Level 3 | D E
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	234	282.9
Level 3 | Other.
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	16.9	17.7
Assets Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	10.7	14.9
Local Currency Equities Member | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.1	0.2
Local Currency Equities Member | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2.3	3.1
Local Currency Equities Member | Fair Value Inputs Level1 [Member] | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.1	0.2
Local Currency Equities Member | Fair Value Inputs Level1 [Member] | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2.3	3.1
Non Local Currency Equities | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	11	21.9
Non Local Currency Equities | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	4.7	5.9
Non Local Currency Equities | Fair Value Inputs Level1 [Member] | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	11	21.9
Non Local Currency Equities | Fair Value Inputs Level1 [Member] | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	4.7	5.9
Local Currency Fixed Income | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	72.9	89.3
Local Currency Fixed Income | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	21.8	25.1
Local Currency Fixed Income | Fair Value Inputs Level1 [Member] | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	72.9	89.3
Local Currency Fixed Income | Fair Value Inputs Level1 [Member] | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	7	15.9
Local Currency Fixed Income | Level 2 | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	14.8	9.2
Other Investment Securities And Cash | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.6	0.8
Other Investment Securities And Cash | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2.7	7
Other Investment Securities And Cash | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1.2	1
Other Investment Securities And Cash | Fair Value Inputs Level1 [Member] | C A
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.6	0.8
Other Investment Securities And Cash | Fair Value Inputs Level1 [Member] | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2.4	6.4
Other Investment Securities And Cash | Fair Value Inputs Level1 [Member] | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.9	0.6
Other Investment Securities And Cash | Level 3 | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.3	0.6
Other Investment Securities And Cash | Assets Measured at NAV | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.3	0.4
Non Local Currency Fixed Income | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	8.4	6.7
Non Local Currency Fixed Income | Fair Value Inputs Level1 [Member] | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	8.4	6.7
Real Estate | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	7.8	9.1
Real Estate | Level 3 | N O
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	7.8	9.1
Equity | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3.8	5.6
Equity | Fair Value Inputs Level1 [Member] | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.3	0.4
Equity | Assets Measured at NAV | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3.5	5.2
Fixed Income | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	7	9.3
Fixed Income | Fair Value Inputs Level1 [Member] | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0.1
Fixed Income | Assets Measured at NAV | U S
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 6.9	$ 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 - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value at beginning of year	$ 310.3	$ 314.3
Gain (loss) on assets held at end of year	(31)	15.6
Gain (loss) on assets sold during the year	(0.7)	0.4
Assets purchased	13.8	16.2
Assets sold	(14.9)	(14.8)
Transfers in		3.5
Currency exchange rate fluctuations	(18.5)	(24.9)
Fair value at end of year	$ 259	$ 310.3

Other Noncurrent Liabilities -

Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Accrued postretirement benefits	$ 5.9	$ 8.4
Employee benefits	4.8	6.1
Other	9.8	13.5
Total	$ 20.5	$ 28

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Income Tax [Line Items]
U.S.	$ 44.1	$ 25.5	$ 20.9
Non-U.S.	89.8	127.9	59.1
Income before income taxes	133.9	153.4	80
Expected tax expense, at U.S. federal statutory income tax rate of 21%	28.1	32.2	16.8
Non-U.S. tax rates	2.1	4.6	0.7
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. companies	(0.5)	(3.9)	(5.5)
Valuation allowance, net	(3.6)	3.1	0.8
Global intangible low-tax income, net	2.1	2.8	2.7
Tax rate changes			(0.3)
Assessment (refund) of prior tax payments, net		0.1	(0.1)
Adjustment to the reserve for uncertain tax positions, net	(0.4)		0.1
Nondeductible expenses	0.9	1	0.9
U.S. state income taxes and other, net	0.7	0.6
Income tax expense	29.4	40.5	16.1
Current payable
U.S. federal and state	10.7	4.6	4.8
Non-U.S.	20.1	21.6	14.9
Total	30.8	26.2	19.7
U.S. federal and state	(3)	3.3	(2.6)
Non-U.S.	1.6	11	(1)
Total	(1.4)	14.3	(3.6)
Income tax expense	29.4	40.5	16.1
Comprehensive provision for income taxes allocable to:
Net income	29.4	40.5	16.1
Other comprehensive income (loss):
Total	79.1	64.5	9.9
Defined benefit pension plans
Other comprehensive income (loss):
Benefit plans	49.3	$ 24	(6)
Other postretirement benefit plans
Other comprehensive income (loss):
Benefit plans	$ 0.4		$ (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, 2022
Income Tax Disclosure [Abstract]
U.S. Federal statutory income tax rate	21%

Income Taxes - Components of Ne

Income Taxes - Components of Net Deferred Income Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Lease assets (liabilities)	$ 5.3	$ 5
Accrued OPEB costs, Assets	1.7	2.3
Accrued pension costs, Assets	21.6	73.6
Other accrued liabilities and deductible differences, Assets	15.3	12.1
Tax loss and tax credit carryforwards, Assets	70.7	78.1
Valuation allowance, Assets	(3.8)	(7.4)
Adjusted gross deferred tax assets	110.8	163.7
Netting by tax jurisdiction, Assets	(58.8)	(56.9)
Net noncurrent deferred tax asset	52	106.8
Inventories, Liabilities	(5.5)	(2.9)
Property and equipment, Liabilities	(59.1)	(62.5)
Lease liabilities	(5.4)	(5.1)
Other taxable differences, Liabilities	(3.9)	(3.3)
Tax on unremitted earnings of non-U.S. subsidiaries, Liabilities	(11.3)	(11.2)
Adjusted gross deferred tax assets (liabilities)	(85.2)	(85)
Netting by tax jurisdiction, Liabilities	58.8	56.9
Net noncurrent deferred tax asset (liability)	$ (26.4)	$ (28.1)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Mar. 27, 2020	Mar. 31, 2020	Dec. 31, 2017	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax [Line Items]
Deferred tax assets valuation allowance				$ 3.8	$ 7.4
Transition tax			$ 74.5
Noncurrent payable to affiliate				$ 33.5	44.7
Income tax liability payable period				8 years
Due To Affiliate Noncurrent				$ 33.5	44.7
Current payable to affiliate				22.9	18.2
Current cash tax benefit				(20.1)	(21.6)	$ (14.9)
Non-cash deferred income tax benefit				(1.6)	(11)	1
Business interest income, adjusted taxable income	30%
CARES act of 2020, Business interest income, adjusted taxable income	50%
Cash tax benefit due to reversal of valuation allowance		$ 0.5
Increase decrease in valuation allowance					$ 2.8	$ 2.8
Non-cash income tax benefit as a reduction of valuation allowance				3.5
Estimated unrecognized tax benefits decrease amount for next twelve months				1
Unrecognized tax benefits that would impact effective tax rate				3.2
Valhi | Income Tax Payable
Income Tax [Line Items]
Noncurrent payable to affiliate				33.5
Payable to affiliate				44.7
Due To Affiliate Noncurrent				33.5
Current payable to affiliate				11.2
Corporate Purposes
Income Tax [Line Items]
Deferred tax assets valuation allowance				0
D E | Corporate Purposes
Income Tax [Line Items]
Net operating loss carryforwards				414
B E | Corporate Purposes
Income Tax [Line Items]
Net operating loss carryforwards				$ 13

Income Taxes - Changes in Amoun

Income Taxes - Changes in Amount of Uncertain Tax Positions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 3.8	$ 4.1	$ 3.9
Net increase (decrease):
Tax positions taken in prior periods			(0.3)
Tax positions taken in current period	0.7	0.6	0.6
Lapse due to applicable statute of limitations	(1.1)	(0.7)	(0.5)
Change in currency exchange rates	(0.2)	(0.2)	0.4
Unrecognized tax benefits at end of year	$ 3.2	$ 3.8	$ 4.1

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	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	111,800		111,800
Shares awarded under proposed long term incentive plan			8,400	7,200	13,500
Number of shares authorized for repurchase						2,000,000
Aggregate purchase price			$ 2.5	$ 0.2	$ 1
Shares available for repurchase under the plan	1,331,332		1,331,332
Common stock
Accumulated Other Comprehensive Income Loss [Line Items]
Stock repurchased and acquired in market transactions	143,897	73,881	217,778	14,409	122,489
Treasury Stock, Common
Accumulated Other Comprehensive Income Loss [Line Items]
Aggregate purchase price			$ 2.5	$ 0.2	$ 1

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 870.2	$ 796.5	$ 816.1
Ending Balance	957.2	870.2	796.5
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(240.4)	(233.4)	(246.8)
Other comprehensive income (loss)	(28.8)	(7)	13.4
Ending Balance	(269.2)	(240.4)	(233.4)
Accumulated Defined Benefit Plans Adjustment | Defined benefit pension plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(163.3)	(214.5)	(202.2)
Other comprehensive income (loss)	9.9	14.9	13.4
Net actuarial gain (loss) arising during year	90.3	36.3	(25.7)
Ending Balance	(63.1)	(163.3)	(214.5)
Accumulated Defined Benefit Plans Adjustment | OPEB Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(0.4)	(0.3)	0.2
Other comprehensive income (loss)	(0.3)	(0.3)	(0.2)
Net actuarial gain (loss) arising during year	1.5	0.2	(0.3)
Ending Balance	0.8	(0.4)	(0.3)
Total Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(404.1)	(448.2)	(448.8)
Other comprehensive income (loss)	72.6	44.1	0.6
Ending Balance	$ (331.5)	$ (404.1)	$ (448.2)

Related Party Transactions - Su

Related Party Transactions - Summary of Receivables from and Payables to Affiliates (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Current receivable from affiliate	$ 2.7	$ 18.4
Current payable to affiliate	22.9	18.2
Noncurrent payable to affiliate	33.5	44.7
Other Affiliates | Other Receivable
Related Party Transaction [Line Items]
Current receivable from affiliate	2.7	2.6
Louisiana Pigment Company, L.P. | Trade Items
Related Party Transaction [Line Items]
Current receivable from affiliate		15.8
Current payable to affiliate	17.1	17.3
Valhi | Income Tax Payable
Related Party Transaction [Line Items]
Current payable to affiliate	5.8	0.9
Noncurrent payable to affiliate	$ 33.5	$ 44.7

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended			24 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2019
Insurance Premiums
Related Party Transaction [Line Items]
Expense transaction with affiliate	$ 20,800,000	$ 23,200,000	$ 19,100,000
Contran Corporation [Member]
Related Party Transaction [Line Items]
Expense transaction with affiliate	300,000	300,000	300,000
Sublease rent expense	500,000	400,000	400,000
Contran Corporation [Member] | Intercorporate Services Agreement
Related Party Transaction [Line Items]
Intercorporate services fees	24,500,000	24,000,000	23,300,000
Louisiana Pigment Company, L.P. | Titanium Dioxide Pigments
Related Party Transaction [Line Items]
Purchase of TiO2	225,600,000	188,600,000	167,800,000
Louisiana Pigment Company, L.P. | Titanium Dioxide Feedstock
Related Party Transaction [Line Items]
Sales of feedstock ore to LPC	106,900,000	85,400,000	$ 84,200,000
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note
Related Party Transaction [Line Items]
Outstanding loans under promissory note	$ 0	0		$ 0
Maximum lending capacity					$ 25,000,000
Percentage of Interest over Prime rate			1%
Interest payable quarterly for the loan	prime plus 1.00%
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note | Interest Income
Related Party Transaction [Line Items]
Interest income on loan			$ 300,000	$ 200,000
Tall Pines Insurance Company | Insurance Premiums
Related Party Transaction [Line Items]
Expense transaction with affiliate	$ 17,300,000	$ 18,600,000	$ 14,800,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) customer	Dec. 31, 2021	Dec. 31, 2020 customer	Dec. 31, 2023 USD ($)
Titanium Dioxide Pigments
Commitment And Contingencies [Line Items]
TiO2 Customers | customer	4,000
Feedstock
Commitment And Contingencies [Line Items]
Minimum purchase commitments | $	$ 1,000			$ 600
Various Raw Materials and Services
Commitment And Contingencies [Line Items]
Minimum purchase commitments | $	$ 84			$ 42
Net Sales | Product Concentration Risk | Titanium Dioxide Pigments
Commitment And Contingencies [Line Items]
Approximate percent sales by volume		92%	93%
Net Sales | Customer Concentration Risk | Titanium Dioxide Pigments | Top ten customers
Commitment And Contingencies [Line Items]
Approximate percent sales by volume	33%	32%	34%
Net Sales | Customer Concentration Risk | Titanium Dioxide Pigments | One customer
Commitment And Contingencies [Line Items]
Approximate percent sales by volume	10%		10%
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Europe [Member]
Schedule Of Net Sales By Geographical Segment [Line Items]
Approximate percent sales by volume	45%	46%	46%
North America [Member]
Schedule Of Net Sales By Geographical Segment [Line Items]
Approximate percent sales by volume	39%	37%	36%

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - Senior Notes	Dec. 31, 2022 EUR (€)
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount	€ 1,000
Debt instrument estimated market price per 1000 principal amount	€ 877

Financial Instruments - Financi

Financial Instruments - Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Cash, cash equivalents and restricted cash, Carrying amount	$ 334.6	$ 412.6	$ 362	$ 392.3
Long-term debt - Fixed rate Senior Notes, Carrying amount	424.1	448.8
Cash, cash equivalents and restricted cash, Fair value	334.6	412.6
Long-term debt - Fixed rate Senior Notes, Fair value	$ 374.2	$ 460.2

Other operating income (expen_2

Other operating income (expense), net (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2022 USD ($)
Other operating income (expense), net:
Gain related to business interruption claim	$ 2.7