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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 Expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | (In millions)
Pre-tax income: |  | ​ |  |  | ​ |  |  | ​ |
United States | ​ | $ | 23.5 | ​ | $ | 45.2 | ​ | $ | 131.4
Non-U.S. subsidiaries | ​ |  | 81.2 | ​ |  | 55.4 | ​ |  | 126.4
Total | ​ | $ | 104.7 | ​ | $ | 100.6 | ​ | $ | 257.8
Expected tax expense at U.S. federal statutory income tax rate of 21% |  | $ | 22.0 | ​ | $ | 21.1 | ​ | $ | 54.1
Non-U.S. tax rates | ​ |  | 5.2 | ​ |  | .5 | ​ |  | 4.5
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. tax group companies | ​ |  | (4.5) | ​ |  | (8.7) | ​ |  | (2.0)
Valuation allowance | ​ |  | 4.5 | ​ |  | 3.8 | ​ |  | .9
Global intangible low-tax income, net | ​ |  | 1.8 | ​ |  | 2.2 | ​ |  | 2.8
Tax rate changes | ​ |  | 4.7 | ​ |  | (.2) | ​ |  | —
U.S. state income taxes, net | ​ |  | (.3) | ​ |  | .9 | ​ |  | 1.5
Adjustment to the reserve for uncertain tax positions, net | ​ |  | (5.1) | ​ |  | (3.8) | ​ |  | (2.6)
Nondeductible expenses | ​ |  | 1.5 | ​ |  | 1.0 | ​ |  | 1.1
Assessment (refund) of prior tax payments, net | ​ |  | (2.1) | ​ |  | — | ​ |  | .1
Other, net | ​ |  | (1.2) | ​ |  | (.9) | ​ |  | (.3)
Income tax expense | ​ | $ | 26.5 | ​ | $ | 15.9 | ​ | $ | 60.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Components of income tax expense: | ​ |  |  | ​ |  |  | ​ |  |
Currently payable: | ​ |  |  | ​ |  |  | ​ |  |
U.S. federal and state | ​ | $ | 4.3 | ​ | $ | 13.3 | ​ | $ | 29.7
Non-U.S. | ​ |  | 22.0 | ​ |  | 14.9 | ​ |  | 21.5
Total | ​ |  | 26.3 | ​ |  | 28.2 | ​ |  | 51.2
Deferred income taxes (benefit): | ​ |  |  | ​ |  |  | ​ |  |
U.S. federal and state | ​ |  | (4.1) | ​ |  | (10.3) | ​ |  | (1.7)
Non-U.S. | ​ |  | 4.3 | ​ |  | (2.0) | ​ |  | 10.6
Total | ​ |  | .2 | ​ |  | (12.3) | ​ |  | 8.9
Income tax expense | ​ | $ | 26.5 | ​ | $ | 15.9 | ​ | $ | 60.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Comprehensive provision for income taxes allocable to: | ​ |  |  | ​ |  |  | ​ |  |
Income from continuing operations | ​ | $ | 26.5 | ​ | $ | 15.9 | ​ | $ | 60.1
Discontinued operations | ​ |  | — | ​ |  | .6 | ​ |  | —
Other comprehensive income (loss): | ​ |  |  | ​ |  |  | ​ |  | ​
Currency translation | ​ |  | (.2) | ​ |  | 1.6 | ​ |  | (.8)
Pension plans | ​ |  | (15.6) | ​ |  | (7.3) | ​ |  | 29.7
Other | ​ |  | (.5) | ​ |  | (.4) | ​ |  | —
Total | ​ | $ | 10.2 | ​ | $ | 10.4 | ​ | $ | 89.0
Components of Net Deferred Tax Asset (Liability) | The components of the net deferred income taxes at December 31, 2020 and 2021 are summarized in the following table.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 | ​ | 2021
​ | ​ | Assets | ​ | Liabilities | ​ | Assets | ​ | Liabilities
​ |  | ​ | (In millions)
Tax effect of temporary differences related to: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Inventories | ​ | $ | 1.9 | ​ | $ | — | ​ | $ | — | ​ | $ | (2.5)
Property and equipment | ​ |  | — | ​ |  | (67.2) | ​ |  | — | ​ |  | (70.4)
Lease assets (liabilities) | ​ |  | 6.3 | ​ |  | (6.5) | ​ |  | 5.0 | ​ |  | (5.1)
Accrued OPEB costs | ​ |  | 3.0 | ​ |  | — | ​ |  | 2.8 | ​ |  | —
Accrued pension costs | ​ |  | 100.5 | ​ |  | — | ​ |  | 74.1 | ​ |  | —
Accrued environmental liabilities | ​ |  | 31.0 | ​ |  | — | ​ |  | 28.5 | ​ |  | —
Other deductible differences | ​ |  | 9.2 | ​ |  | — | ​ |  | 9.3 | ​ |  | —
Other taxable differences | ​ |  | — | ​ |  | (13.1) | ​ |  | — | ​ |  | (15.5)
Investments in subsidiaries and affiliates | ​ |  | 2.7 | ​ |  | (48.1) | ​ |  | 7.3 | ​ |  | (52.7)
Tax on unremitted earnings of non-U.S. subsidiaries | ​ |  | — | ​ |  | (12.0) | ​ |  | — | ​ |  | (11.2)
Tax loss and tax credit carryforwards | ​ |  | 100.4 | ​ |  | — | ​ |  | 89.4 | ​ |  | —
Valuation allowance | ​ |  | (17.5) | ​ |  | — | ​ |  | (18.4) | ​ |  | —
Adjusted gross deferred tax assets (liabilities) | ​ |  | 237.5 | ​ |  | (146.9) | ​ |  | 198.0 | ​ |  | (157.4)
Netting of items by tax jurisdiction | ​ |  | (117.3) | ​ |  | 117.3 | ​ |  | (111.2) | ​ |  | 111.2
Net noncurrent deferred tax asset (liability) | ​ | $ | 120.2 | ​ | $ | (29.6) | ​ | $ | 86.8 | ​ | $ | (46.2)
Changes in Uncertain Tax Positions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 | ​ | 2021
​ |  | ​ | (In millions)
Unrecognized tax benefits: |  | ​ |  |  | ​ |  | ​ |  |
Amount at beginning of year | ​ | $ | 21.0 | ​ | $ | 13.8 | ​ | $ | 9.6
Net increase (decrease): | ​ |  |  | ​ |  |  | ​ |  |
Tax positions taken in prior periods | ​ |  | (5.6) | ​ |  | (.3) | ​ |  | —
Tax positions taken in current period | ​ |  | .7 | ​ |  | .6 | ​ |  | .6
Lapse due to applicable statute of limitations | ​ |  | — | ​ |  | (4.8) | ​ |  | (3.6)
Settlement with taxing authorities | ​ |  | (2.2) | ​ |  | — | ​ |  | —
Changes in currency exchange rates | ​ |  | (.1) | ​ |  | .3 | ​ |  | (.2)
Amount at end of year | ​ | $ | 13.8 | ​ | $ | 9.6 | ​ | $ | 6.4

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