Derivatives (Fair Value Hedges) (Details) (Interest Expense, Net [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
Interest Rate Swaps [Member]
Amount of gain (loss) recognized in income	$ 5.7	$ 7.8	$ 3.2	$ (0.8)
Fixed Rate Debt [Member]
Amount of gain (loss) recognized in income	$ (5.7)	$ (7.8)	$ (3.2)	$ 0.8