Derivatives and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	$ 6.3	$ 20.6
Derivative Liability, Fair Value, Net, Total	(4.6)	(3.6)
Designated as Hedging Instrument [Member] | Foreign currency forward contracts [Member]
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	0.2	0.5
Derivative Liability, Fair Value, Net, Total	(0.2)	(0.6)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	2.0	2.1
Derivative Liability, Fair Value, Net, Total	(0.1)
Not Designated as Hedging Instrument [Member] | Foreign currency forward contracts [Member]
Fair Value of Derivative Instruments
Derivative Asset, Fair Value, Net, Total	4.1	18.0
Derivative Liability, Fair Value, Net, Total	$ (4.3)	$ (3.0)