Reclassifications out of Accumulated Other Comprehensive Loss (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from AOCL to Interest expense, net of capitalized interest	$ (574.7)	$ (562.0)
Related tax impact	290.2	158.3
Net loss	(216.7)	(281.1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Losses on Derivative Instruments [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from AOCL to Interest expense, net of capitalized interest	3.9	7.1
Related tax impact	(1.4)	(2.6)
Net loss	$ 2.5	$ 4.5