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Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule Of Income Tax [Line Items]        
Expected tax expense, at U.S. federal statutory income tax rate of 21% $ 8.5 $ 23.2 $ 17.6 $ 44.1
Non-U.S. tax rates 2.3 7.9 4.7 15.0
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies (0.6) 0.7 (1.1) 1.1
Global intangible low-tax income, net 0.7   1.5  
Adjustment to reserve for uncertain tax positions, net 0.2   0.4 1.4
Other, net 0.3 0.6 1.1 1.2
Income tax expense 11.4 32.4 24.2 61.4
Comprehensive provision for income taxes allocable to:        
Net income 11.4 32.4 24.2 61.4
Other comprehensive income (loss):        
Total 12.5 33.4 26.5 63.5
Defined Benefit Pension Plans        
Other comprehensive income (loss):        
Benefit plans 1.2 1.1 2.4 2.2
OPEB        
Other comprehensive income (loss):        
Benefit plans $ (0.1) $ (0.1) $ (0.1) (0.1)
Canada - Germany APA        
Schedule Of Income Tax [Line Items]        
Canada-Germany APA       $ (1.4)