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Derivative Instruments (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Foreign currency forward contracts that were entered into to hedge forecasted revenue     
Total foreign currency forward contracts$ 511.4 $ 511.4 $ 494.2
Derivative Instruments (Textuals) [Abstract]     
Lower Range of Durations of foreign currency forward contracts1 month 1 month 1 month
Higher Range of Durations of foreign currency forward contracts12 months 12 months 12 months
Gain/Loss on fair value of Foreign currency forward contracts13.5 13.5 11.0
Expected Settlement time for contracts, in months12 months 12 months  
Gains and losses in earnings of Foreign currency forward contracts due to hedge ineffectiveness(2.8)1.4(3.2)0.9 
Gains/(Losses) in product revenue for the settlement of certain effective cash flow hedge instruments(10.8)20.7(37.6)40.6 
Aggregate notional amount of outstanding foreign currency contracts342.1 342.1  
Fair Value of outstanding foreign currency contracts6.5 6.5  
Net (gains) losses of other income (expense) related to foreign currency forward contracts(6.1)10.1(1.8)(3.0) 
Euro [Member]
     
Foreign currency forward contracts that were entered into to hedge forecasted revenue     
Total foreign currency forward contracts503.2 503.2 460.3
Canadian Dollar [Member]
     
Foreign currency forward contracts that were entered into to hedge forecasted revenue     
Total foreign currency forward contracts5.8 5.8 24.0
Swedish krona [Member]
     
Foreign currency forward contracts that were entered into to hedge forecasted revenue     
Total foreign currency forward contracts2.4 2.4 9.9
Foreign Exchange Contract [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]
     
Summary of Derivatives designated as Hedging Instruments     
Derivative Asset, Fair Value10.6 10.6 0
Foreign Exchange Contract [Member] | Accrued Expenses and Other Liabilities [Member] | Designated as Hedging Instrument [Member]
     
Summary of Derivatives designated as Hedging Instruments     
Derivative Liability, Fair Value$ 0.2 $ 0.2 $ 11.0