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Income taxes - Components of Comprehensive Provision for Income Taxes Allocation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income taxes |  |  |  |
Expected tax expense at U.S. federal statutory income tax rate of 21% | $ 3.2 | $ 7.9 | $ 9.7 | $ 11.7
U.S. federal statutory income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Non-U.S. tax rates | $ (0.3) | $ (0.1) | $ 0.2 | $ (0.1)
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. tax group companies | (2.1) | (3.5) | (2.5) | (4.3)
Global intangible low-taxed income, net | 1.9 | 1.1 | 2.5 | 1.4
Valuation allowance, net | 5.3 | 1.7 | 5.5 | 2.5
Nondeductible expenses | 0.8 | 0.4 | 1.3 | 0.6
U.S. state income taxes and other, net | (0.8) | 0.4 | (0.7) | 0.5
Income tax expense | 8.0 | 7.9 | 16.0 | 12.3
Comprehensive provision for income taxes allocable to: |  |  |  |
Net income | 8.0 | 7.9 | 16.0 | 12.3
Other comprehensive income (loss): |  |  |  |
Currency translation | 1.7 | 0.2 | 3.6 | (2.1)
Pension plans | 0.2 | 0.3 | 0.4 | 0.6
Other |  | (0.1) |  | (0.2)
Total | $ 9.9 | $ 8.3 | $ 20.0 | $ 10.6

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