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Stockholders' equity - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | $ 393.9 | $ 82.4 | $ 580.3
Loss before income taxes | 347.8 | 62.6 | 461.7
Income tax | 79.3 | 42.3 | (11.9)
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Loss before income taxes | 420.3 | 156.1 | 676.1
Income tax | (1.8) | (6.0) | (59.3)
Consolidated net loss | 418.5 | 150.1 | 616.8
Reclassification out of Accumulated Other Comprehensive Income | Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | (3.7) | 2.9 | 4.0
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | (5.4) | (5.8) | (6.2)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial losses |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | 80.5 | 159.0 | 178.9
Reclassification out of Accumulated Other Comprehensive Income | Settlement losses |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other (expense), net | $ 348.9 | $ 0.0 | $ 499.4

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