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v3.22.2.2

Stockholders' Equity (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2022
Equity [Abstract] |
Accumulated Other Comprehensive Loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 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 | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.8 | ​ | $ | 1.7
Other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Unrealized loss arising during the period | ​ |  | — | ​ |  | (.1) | ​ |  | (.1) | ​ |  | (.1)
Balance at end of period | ​ | $ | 1.7 | ​ | $ | 1.6 | ​ | $ | 1.7 | ​ | $ | 1.6
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (64.8) | ​ | $ | (92.1) | ​ | $ | (67.4) | ​ | $ | (72.2)
Other comprehensive loss arising during the period | ​ |  | (5.3) | ​ |  | (17.2) | ​ |  | (2.7) | ​ |  | (37.1)
Balance at end of period | ​ | $ | (70.1) | ​ | $ | (109.3) | ​ | $ | (70.1) | ​ | $ | (109.3)
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (149.1) | ​ | $ | (117.3) | ​ | $ | (154.1) | ​ | $ | (120.9)
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 2.5 | ​ |  | 1.7 | ​ |  | 7.5 | ​ |  | 5.3
Balance at end of period | ​ | $ | (146.6) | ​ | $ | (115.6) | ​ | $ | (146.6) | ​ | $ | (115.6)
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | .1 | ​ | $ | (.1) | ​ | $ | .3 | ​ | $ | .1
Other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.1) | ​ |  | (.1) | ​ |  | (.3) | ​ |  | (.3)
Balance at end of period | ​ | $ | — | ​ | $ | (.2) | ​ | $ | — | ​ | $ | (.2)
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (212.1) | ​ | $ | (207.8) | ​ | $ | (219.4) | ​ | $ | (191.3)
Other comprehensive income (loss) | ​ |  | (2.9) | ​ |  | (15.7) | ​ |  | 4.4 | ​ |  | (32.2)
Balance at end of period | ​ | $ | (215.0) | ​ | $ | (223.5) | ​ | $ | (215.0) | ​ | $ | (223.5)

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