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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Component of Income Taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | ​ | (In millions)
Expected tax expense, at U.S. federal statutory income tax rate of 21% | ​ | $ | 6.0 | ​ | $ | 2.9 | ​ | $ | 12.8
Non-taxable dividends received from Kronos | ​ |  | (5.3) | ​ |  | (5.3) | ​ |  | (5.3)
U.S. state income taxes and other, net | ​ |  | (.1) | ​ |  | (.1) | ​ |  | —
Income tax expense (benefit) | ​ | $ | .6 | ​ | $ | (2.5) | ​ | $ | 7.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Components of income tax expense (benefit): | ​ |  |  | ​ |  |  | ​ |  |
Currently payable | ​ | $ | .2 | ​ | $ | — | ​ | $ | —
Deferred income tax expense (benefit) | ​ |  | .4 | ​ |  | (2.5) | ​ |  | 7.5
Income tax expense (benefit) | ​ | $ | .6 | ​ | $ | (2.5) | ​ | $ | 7.5
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Comprehensive provision (benefit) for income taxes allocable to: | ​ |  |  | ​ |  |  | ​ |  |
Net income (loss) | ​ | $ | .6 | ​ | $ | (2.5) | ​ | $ | 7.5
Additional paid-in capital | ​ |  | (.2) | ​ |  | (.1) | ​ |  | —
Other comprehensive income (loss): | ​ |  |  | ​ |  |  | ​ |  |
Currency translation | ​ |  | (.1) | ​ |  | .9 | ​ |  | (.4)
Pension plans | ​ |  | (.8) | ​ |  | (.7) | ​ |  | 3.2
OPEB plans | ​ |  | — | ​ |  | (.1) | ​ |  | —
Total | ​ | $ | (.5) | ​ | $ | (2.5) | ​ | $ | 10.3
Components of Net Deferred Tax Liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2021
​ |  | Assets |  | Liabilities |  | Assets |  | Liabilities
​ | ​ | (In millions)
Tax effect of temporary differences related to: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Inventories | ​ | $ | .4 | ​ | $ | — | ​ | $ | .5 | ​ | $ | —
Marketable securities | ​ |  | — | ​ |  | (3.6) | ​ |  | — | ​ |  | (7.0)
Property and equipment | ​ |  | — | ​ |  | (2.6) | ​ |  | — | ​ |  | (2.7)
Accrued OPEB costs | ​ |  | .3 | ​ |  | — | ​ |  | .2 | ​ |  | —
Accrued pension costs | ​ |  | .5 | ​ |  | — | ​ |  | .5 | ​ |  | —
Accrued employee benefits | ​ |  | 1.1 | ​ |  | — | ​ |  | 1.3 | ​ |  | —
Accrued environmental liabilities | ​ |  | 29.1 | ​ |  | — | ​ |  | 26.7 | ​ |  | —
Goodwill | ​ |  | — | ​ |  | (1.7) | ​ |  | — | ​ |  | (1.7)
Other accrued liabilities and deductible differences | ​ |  | — | ​ |  | — | ​ |  | .2 | ​ |  | —
Other taxable differences | ​ |  | — | ​ |  | (2.3) | ​ |  | — | ​ |  | (2.3)
Investment in Kronos Worldwide, Inc. | ​ |  | — | ​ |  | (55.0) | ​ |  | — | ​ |  | (59.8)
Adjusted gross deferred tax assets (liabilities) | ​ |  | 31.4 | ​ |  | (65.2) | ​ |  | 29.4 | ​ |  | (73.5)
Netting of items by tax jurisdiction | ​ |  | (31.4) | ​ |  | 31.4 | ​ |  | (29.4) | ​ |  | 29.4
Net noncurrent deferred tax liability | ​ | $ | — | ​ | $ | (33.8) | ​ | $ | — | ​ | $ | (44.1)

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