Derivatives and Hedging Activities - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments Gain Loss [Line Items]
Interest expenses	$ 227.7	$ 287.7	$ 361.0
Interest Rate and Currency Swap [Member] | Designated as Hedging Instruments [Member]
Derivative Instruments Gain Loss [Line Items]
Gain on interest rate and currency swaps	42.9	16.5
Interest expenses	$ 6.0	$ 3.0