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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule Of Income Tax [Line Items]        
Expected tax expense, at U.S. federal statutory income tax rate of 21% $ 2.1 $ 5.1 $ 14.5 $ 22.7
Non-U.S. tax rates 0.1 1.2 0.7 5.9
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies 0.1 (1.1) (4.5) (2.2)
Global intangible low-tax income, net (0.9) 0.1 3.3 1.6
Valuation allowance 0.5   0.5  
Adjustment to the reserve for uncertain tax positions, net (0.5) 0.2   0.6
Nondeductible expenses   0.3 1.0 0.9
Other, net 0.4 0.5 (0.2) 1.0
Income tax expense 1.8 6.3 15.3 30.5
Comprehensive provision for income taxes allocable to:        
Net income 1.8 6.3 15.3 30.5
Other comprehensive income (loss):        
Total 3.2 7.5 19.4 34.0
Defined Benefit Pension Plans        
Other comprehensive income (loss):        
Benefit plans $ 1.4 $ 1.2 4.2 3.6
OPEB        
Other comprehensive income (loss):        
Benefit plans     $ (0.1) $ (0.1)