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Stockholders' equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period |  |  | $ 1,036.1 |
Balance at end of period | $ 1,047.5 |  | 1,047.5 |
Marketable Securities |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | 1.7 | $ 1.7 | 1.7 | $ 1.7
Other comprehensive income (loss) |  | 0.1 |  | 0.1
Balance at end of period | 1.7 | 1.8 | 1.7 | 1.8
Currency Translation |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | (90.8) | (101.2) | (111.7) | (88.8)
Other comprehensive income (loss) | 0.1 | 4.1 | 21.0 | (8.3)
Balance at end of period | (90.7) | (97.1) | (90.7) | (97.1)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | (48.5) | (57.8) | (49.4) | (58.8)
Other comprehensive income (loss) | 0.5 | 0.6 | 1.4 | 1.6
Balance at end of period | (48.0) | (57.2) | (48.0) | (57.2)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | 0.1 | 0.3 | 0.2 | 0.4
Other comprehensive income (loss) | (0.1) | (0.1) | (0.2) | (0.2)
Balance at end of period |  | 0.2 |  | 0.2
Total Accumulated Other Comprehensive Loss |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | (137.5) | (157.0) | (159.2) | (145.5)
Other comprehensive income (loss) | 0.5 | 4.7 | 22.2 | (6.8)
Balance at end of period | $ (137.0) | $ (152.3) | $ (137.0) | $ (152.3)

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