Derivatives and Hedging Activities (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	$ 17.4	$ 6.6
Derivative Liability, Fair Value, Net, Total	(0.2)	(1.0)
Designated as Hedging Instrument [Member] | Foreign Currency Forward [Member]
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	0.3	0.1
Derivative Liability, Fair Value, Net, Total	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	9.5	6.0
Derivative Liability, Fair Value, Net, Total	0	(0.2)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward [Member]
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	7.6	0.5
Derivative Liability, Fair Value, Net, Total	$ (0.2)	$ (0.8)