Derivatives and Hedging Activities - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments Gain Loss [Line Items]
Gain loss on interest rate and currency swaps	$ (22.8)	$ (5.5)	$ (42.4)	$ 48.4
Interest expenses	54.3	59.0	109.0	117.5
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	12.0	4.0	(22.0)	13.0
Interest expenses	$ 1.0	$ 2.0	$ 2.0	$ 3.0