Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest rate products [Member]
Company's derivative instruments on net loss
Derivative Instruments, (Loss) Gain Recognized in OCI, Effective Portion	$ (7.6)	$ (1.0)	$ (6.3)	$ (2.6)
Interest expense [Member]
Company's derivative instruments on net loss
Derivative Instruments, (Loss) Gain Reclassified from Accumulated OCI into (Income) Loss, Effective Portion	$ (0.2)		$ (0.2)