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Summary of Significant Accounting Policies - Summary of Other (Income) Expense, Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Other expense $ 57.2 $ 42.2 $ 71.4
Other income (61.3) (35.8) (2.8)
Other (income) expense, net $ (4.1) $ 6.4 $ 68.6