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Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule Of Income Tax [Line Items]        
Expected tax expense, at U.S. federal statutory income tax rate of 21% $ 10.1 $ 2.1 $ 22.8 $ 14.5
Non-U.S. tax rates 1.3 0.1 3.0 0.7
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies (1.2) 0.1 (2.7) (4.5)
Global intangible low-tax income, net 0.6 (0.9) 1.6 3.3
Valuation allowance, net 0.6 0.5 1.7 0.5
Adjustment to the reserve for uncertain tax positions, net 0.1 (0.5) (0.3)  
Nondeductible expenses 0.2   0.6 1.0
Other, net 0.4 0.4 0.6 (0.2)
Income tax expense 12.1 1.8 27.3 15.3
Comprehensive provision for income taxes allocable to:        
Net income 12.1 1.8 27.3 15.3
Other comprehensive income (loss):        
Total 13.6 3.2 32.0 19.4
Defined Benefit Pension Plans        
Other comprehensive income (loss):        
Benefit plans 1.6 $ 1.4 4.8 4.2
OPEB        
Other comprehensive income (loss):        
Benefit plans $ (0.1)   $ (0.1) $ (0.1)