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Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) (Imported) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Income Tax [Line Items]      
United States $ 53.2 $ 81.4 $ 131.4
Non-U.S. subsidiaries (72.7) 88.5 126.4
Income (loss) before income taxes (19.5) 169.9 257.8
Expected tax expense (benefit) at U.S. federal statutory income tax rate of 21% $ (4.1) $ 35.7 $ 54.1
U.S. federal statutory income tax rate 21.00% 21.00% 21.00%
Non-U.S. tax rates $ (6.3) $ 2.0 $ 4.5
Incremental net tax (benefit) on earnings and losses of U.S. and non-U.S. tax group companies (13.9) (1.7) (2.0)
Valuation allowance 2.2 (3.0) 0.9
Global intangible low-tax income, net (0.4) 1.8 2.8
U.S. state income taxes and other, net 0.6 1.5 1.5
Adjustment to the reserve for uncertain tax positions, net (0.7) (2.9) (2.6)
Nondeductible expenses 1.2 1.0 1.1
Other, net (1.0) (0.6) (0.2)
Income tax expense (22.4) 33.8 60.1
Comprehensive provision (benefit) for income taxes allocable to:      
Income tax expense (benefit) (22.4) 33.8 60.1
Other comprehensive income (loss):      
Currency translation 0.4 (3.3) (0.8)
Total (29.9) 92.1 89.0
Pension Plans Defined Benefit [Member]      
Other comprehensive income (loss):      
Defined benefit plans (7.6) 60.7 $ 29.7
Other Postretirement Benefit Plans Defined Benefit [Member]      
Other comprehensive income (loss):      
Defined benefit plans $ (0.3) $ 0.9