Derivative Instruments, Cash Flow Hedges (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended		6 Months Ended						3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2011 Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2012 Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2011 Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2012 Other Current Assets [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Dec. 31, 2011 Other Current Assets [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2012 Other Current Liabilities [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Dec. 31, 2011 Other Current Liabilities [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2012 Operating Expense [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2011 Operating Expense [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2012 Operating Expense [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]	Jun. 30, 2011 Operating Expense [Member] Foreign Exchange Contract [Member] Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge	1 year
Derivative Asset Designated as Hedging Instrument, Fair Value						$ 0.4	$ 0.4
Derivative Liability Designated as Hedging Instrument, Fair Value								4.0	9.6
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion			1.9	0.8	7.1
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion										2.0		5.5
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion											1.7		2.2
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion		$ (5.2)