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Income taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Schedule Of Income Tax [Line Items] |  |
Income from continuing operations before income taxes | $ (9.8) | $ 83.3
Expected tax expense, at U.S. federal statutory income tax rate of 21% | (2.1) | 17.5
Non-U.S. tax rates |  | 2.1
Incremental net tax benefit on earnings and losses of U.S. and non-U.S. tax group companies | 0.4 | (0.9)
Valuation allowance | (0.9) | 0.6
Global intangible low-tax income, net | (1.5) | 0.7
U.S. state income taxes and other, net | 0.3 | 0.2
Adjustment to the reserve for uncertain tax positions, net | (1.4) | (0.7)
Adjustment of prior year taxes, net | (0.4) |
Nondeductible expenses | (0.5) | 0.4
Income tax expense | (6.1) | 19.9
Comprehensive provision for income taxes allocable to: |  |
Net income | (6.1) | 19.9
Other comprehensive income (loss): |  |
Currency translation | (0.8) | 0.7
Other | (0.2) | 0.2
Total | (6.8) | 22.2
Pension Plans |  |
Other comprehensive income (loss): |  |
Defined benefit plans | $ 0.3 | $ 1.4

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