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Derivatives and Hedging Activities - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments Gain Loss [Line Items]      
Gain (loss) on interest rate and currency swaps $ (52.3) $ 67.8 $ 17.7
Interest expenses 213.1 227.7 287.7
Interest Rate and Currency Swap [Member] | Designated as Hedging Instruments [Member]      
Derivative Instruments Gain Loss [Line Items]      
Gain (loss) on interest rate and currency swaps 20.8 31.6 16.5
Interest expenses $ 5.1 $ 5.9 $ 3.0