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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments Gain Loss [Line Items]
Interest expenses	$ 59.0	$ 73.9	$ 117.5	$ 152.4
Designated as Hedging Instruments [Member] | Interest Rate and Currency Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Gain on interest rate and currency swaps			12.0
Interest expenses			$ 3.0