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Other Assets, Net - Components of Other Assets (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other Assets [Abstract]        
Amortization expense $ 13.9 $ 22.6 $ 54.6 $ 71.2