Derivative Instruments (Details 2) (Interest rate contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivatives designated as hedging instruments [Member]
Effect of derivative instruments in the consolidated statements of comprehensive loss
Amount of (Gain) or loss recognized in AOCL (effective portion)		$ 45.8		$ 1.8
Derivatives designated as hedging instruments [Member] | Interest expense [Member]
Effect of derivative instruments in the consolidated statements of comprehensive loss
Amount of (Gain) or loss reclassified from AOCL into net Loss (effective portion)	7.2	9.2	14.3	19.3
Amount of (Gain) or loss recognized in net loss (ineffective portion)		14.2		4.4
Derivatives not designated as hedging instruments [Member] | Interest expense [Member]
Effect of derivative instruments in the consolidated statements of comprehensive loss
Amount of (Gain) or loss recognized in net loss	$ (17.6)	$ 8.9	$ 17.1	$ 5.6