Derivative Instruments - Effect of Derivative Instruments in Consolidated Statements of Comprehensive Loss (Detail) (Interest rate contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivatives designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain)or Loss Recognized in AOCL (Effective Portion)		$ 72.6		$ 74.4
Amount of (Gain) or Loss Reclassified from AOCL into Net Loss (Effective Portion )	6.9	40.5	21.2	59.8
Amount of (Gain) or Loss Recognized in Net Loss (Ineffective Portion)		(78.7)		(74.3)
Derivatives not designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Recognized in Net Loss	$ (6.2)	$ 6.3	$ 10.9	$ 11.9