Derivatives and Hedging Activities - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on interest rate and currency swaps	$ (7.3)	$ 22.5	$ (49.7)	$ 70.9
Interest expenses	52.8	54.8	161.8	172.3
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	1.2	24.0	(20.5)	37.2
Interest expenses	$ 1.5	$ 1.4	$ 4.0	$ 4.8