Debt (Details 3) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Gain (loss) on our interest rate locks (settlement and amortization) included in comprehensive income
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ (13.6)	$ 0.1	$ (21.0)	$ (3.6)