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Other Comprehensive (Loss) Income - Schedule of Components of Other Comprehensive (Loss) Income and Income Tax Expense (Benefit) Allocated to Each Component (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive loss, Before Tax Amount $ (6.3) $ 17.1 $ (23.2) $ (72.3)
Other comprehensive loss, Income Tax 0.5 0.5 2.0 (1.9)
Other comprehensive (loss) income (6.8) 16.6 (25.2) (70.4)
Translation adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive loss, Before Tax Amount (8.4) 17.7 (31.1) 46.8
Other comprehensive loss, Income Tax 0.0   0.0  
Other comprehensive (loss) income (8.4) 17.7 (31.1) 46.8
Adjustment for net periodic pension and OPEB cost        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive loss, Before Tax Amount 2.1 1.2 7.9 3.2
Other comprehensive loss, Income Tax 0.5 0.5 2.0 1.1
Other comprehensive (loss) income $ 1.6 0.7 $ 5.9 2.1
Adjustments for available-for-sale securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive loss, Before Tax Amount   (1.8)   (122.3)
Other comprehensive loss, Income Tax       (3.0)
Other comprehensive (loss) income   $ (1.8)   $ (119.3)