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Income taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Income Tax [Line Items] |  |  |
U.S. | $ (1.5) | $ 44.1 | $ 25.5
Non-U.S. | (71.4) | 89.8 | 127.9
Income (loss) before income taxes | (72.9) | 133.9 | 153.4
Expected tax expense (benefit), at U.S. federal statutory income tax rate of 21% | $ (15.3) | 28.1 | 32.2
U.S. Federal statutory income tax rate | 21.00% |  |
Non-U.S. tax rates | $ (6.3) | 2.1 | 4.6
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. companies | (4.7) | (0.5) | (3.9)
Valuation allowance, net | 2.6 | (3.6) | 3.1
Global intangible low-tax income, net | (0.3) | 2.1 | 2.8
Adjustment to the reserve for uncertain tax positions, net | (0.5) | (0.4) |
Nondeductible expenses | 1.0 | 0.9 | 1.0
U.S. state income taxes and other, net | (0.3) | 0.7 | 0.7
Income tax expense (benefit) | (23.8) | 29.4 | 40.5
Current payable: |  |  |
U.S. federal and state | 2.0 | 10.7 | 4.6
Non-U.S. | 13.5 | 20.1 | 21.6
Total | 15.5 | 30.8 | 26.2
U.S. federal and state | (3.7) | (3.0) | 3.3
Non-U.S. | (35.6) | 1.6 | 11.0
Total | (39.3) | (1.4) | 14.3
Comprehensive provision for income taxes (benefit) allocable to: |  |  |
Net income (loss) | (23.8) | 29.4 | 40.5
Other comprehensive income (loss): |  |  |
Total | (30.7) | 79.1 | 64.5
Defined benefit pension plans |  |  |
Other comprehensive income (loss): |  |  |
Pension plans | (6.7) | 49.3 | $ 24.0
OPEB Plans |  |  |
Other comprehensive income (loss): |  |  |
Pension plans | $ (0.2) | $ 0.4 |

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