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Other Assets - Components of Other Assets (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Other Assets [Line Items]          
Amortization expense $ 23.0 $ 24.8 $ 48.6 $ 53.8  
Puerto Rico Tax Restructuring [Member]          
Other Assets [Line Items]          
Prepay of taxes         $ 20.2