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Income Taxes (Tables) | 12 Months Ended
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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 income tax rate of 21% | ​ | $ | 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. and non-U.S. companies | ​ |  | (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
​

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