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Stockholders' equity - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | $ 140.8 | $ 393.9 | $ 82.4
Total before tax | 75.3 | 347.8 | 62.6
Income tax | 117.9 | 79.3 | 42.3
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total before tax | 212.1 | 420.3 | 156.1
Income tax | (4.0) | (1.8) | (6.0)
Total reclassifications for the period | 208.1 | 418.5 | 150.1
Reclassification out of Accumulated Other Comprehensive Income | Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | 2.6 | (3.7) | 2.9
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | (5.4) | (5.4) | (5.8)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial losses |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | 84.3 | 80.5 | 159.0
Reclassification out of Accumulated Other Comprehensive Income | Settlement losses |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | $ 130.6 | $ 348.9 | $ 0.0

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