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Summary of Significant Accounting Policies - Summary of Other (Income) Expense, Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Other expense $ 42.2 $ 71.4 $ 82.4
Other income (35.8) (2.8) (8.1)
Other expense, net $ 6.4 $ 68.6 $ 74.3