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Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Schedule Of Income Tax [Line Items]        
Expected tax expense, at U.S. federal statutory income tax rate of 21% $ 3.6 $ 6.6 $ 13.9 $ 15.5
Incremental net tax benefit on earnings and losses of non-U.S., U.S. and non-tax group companies (2.1)   (3.9) (0.2)
Non-U.S. tax rates 0.1 2.3 1.0 4.6
Valuation allowance 7.2 2.8 7.0 3.8
Adjustment to the reserve for uncertain tax positions, net 0.6 0.5 1.2 1.0
Global intangible low-tax income, net 11.9 0.4 13.1 1.1
Nondeductible expenses 1.4 0.3 1.8 0.6
U.S. state income taxes and other, net (1.5) 0.1 (1.5) 0.8
Income tax expense 21.2 13.0 32.6 27.2
Comprehensive provision for income taxes allocable to:        
Net income 21.2 13.0 32.6 27.2
Other comprehensive income (loss):        
Currency translation 2.0 0.8 (2.7) 0.8
Total 25.1 15.2 33.4 30.9
OPEB        
Other comprehensive income (loss):        
Defined benefit plans 0.1 (0.1) (0.1) (0.2)
Pension Plans        
Other comprehensive income (loss):        
Defined benefit plans $ 1.8 $ 1.5 $ 3.6 $ 3.1