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v3.25.3

Stockholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2025
Stockholders' equity |
Schedule of changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2025 |  | 2024 |  | 2025
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Marketable securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.7
Other comprehensive income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized gain arising during the period | ​ | ​ | .1 | ​ | ​ | — | ​ | ​ | .1 | ​ | ​ | —
Balance at end of period | ​ | $ | 1.8 | ​ | $ | 1.7 | ​ | $ | 1.8 | ​ | $ | 1.7
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (101.2) | ​ | $ | (90.8) | ​ | $ | (88.8) | ​ | $ | (111.7)
Other comprehensive income (loss) arising during the period | ​ |  | 4.1 | ​ |  | .1 | ​ |  | (8.3) | ​ |  | 21.0
Balance at end of period | ​ | $ | (97.1) | ​ | $ | (90.7) | ​ | $ | (97.1) | ​ | $ | (90.7)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (57.8) | ​ | $ | (48.5) | ​ | $ | (58.8) | ​ | $ | (49.4)
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | .6 | ​ |  | .5 | ​ |  | 1.6 | ​ |  | 1.4
Balance at end of period | ​ | $ | (57.2) | ​ | $ | (48.0) | ​ | $ | (57.2) | ​ | $ | (48.0)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | .3 | ​ | $ | .1 | ​ | $ | .4 | ​ | $ | .2
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.1) | ​ |  | (.1) | ​ |  | (.2) | ​ |  | (.2)
Balance at end of period | ​ | $ | .2 | ​ | $ | — | ​ | $ | .2 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (157.0) | ​ | $ | (137.5) | ​ | $ | (145.5) | ​ | $ | (159.2)
Other comprehensive income (loss) | ​ |  | 4.7 | ​ |  | .5 | ​ |  | (6.8) | ​ |  | 22.2
Balance at end of period | ​ | $ | (152.3) | ​ | $ | (137.0) | ​ | $ | (152.3) | ​ | $ | (137.0)
​

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