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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2022
Equity [Abstract] |
Accumulated Other Comprehensive Loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2021 |  | 2022 |  | 2021 |  | 2022
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ | ​
Balance at beginning of period | ​ | $ | 1.8 | ​ | $ | 1.7 | ​ | $ | 1.8 | ​ | $ | 1.7
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Unrealized loss arising during the period | ​ |  | (.1) | ​ |  | — | ​ |  | (.1) | ​ |  | —
Balance at end of period | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.7
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (66.1) | ​ | $ | (68.0) | ​ | $ | (67.4) | ​ | $ | (72.2)
Other comprehensive gain (loss) arising during the period | ​ |  | 1.3 | ​ |  | (24.1) | ​ |  | 2.6 | ​ |  | (19.9)
Balance at end of period | ​ | $ | (64.8) | ​ | $ | (92.1) | ​ | $ | (64.8) | ​ | $ | (92.1)
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (151.6) | ​ | $ | (119.1) | ​ | $ | (154.1) | ​ | $ | (120.9)
Other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 2.5 | ​ |  | 1.8 | ​ |  | 5.0 | ​ |  | 3.6
Balance at end of period | ​ | $ | (149.1) | ​ | $ | (117.3) | ​ | $ | (149.1) | ​ | $ | (117.3)
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | .1 | ​ | $ | — | ​ | $ | .3 | ​ | $ | .1
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | — | ​ |  | (.1) | ​ |  | (.2) | ​ |  | (.2)
Balance at end of period | ​ | $ | .1 | ​ | $ | (.1) | ​ | $ | .1 | ​ | $ | (.1)
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (215.8) | ​ | $ | (185.4) | ​ | $ | (219.4) | ​ | $ | (191.3)
Other comprehensive income (loss) | ​ |  | 3.7 | ​ |  | (22.4) | ​ |  | 7.3 | ​ |  | (16.5)
Balance at end of period | ​ | $ | (212.1) | ​ | $ | (207.8) | ​ | $ | (212.1) | ​ | $ | (207.8)

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