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Derivative Instruments (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Lower range of durations of foreign currency forward contracts 1 month 1 month  
Higher range of durations of foreign currency forward contracts 12 months 12 months  
Gain/Loss on fair value of Foreign currency forward contracts $ (11.8) $ 36.5 $ (11.0)
Expected settlement time for contracts, in months 12 months    
Gains and losses in earnings of Foreign currency forward contracts due to hedge ineffectiveness 4.8 (3.9) 0.4
Gains/(Losses) in product revenue for the settlement of certain effective cash flow hedge instruments 35.1 (36.9) 45.7
Aggregate notional amount of outstanding foreign currency contracts 243.2 263.7  
Fair value of outstanding foreign currency contracts 1.7 6.4  
Net gains (losses) of other income (expense) related to foreign currency forward contracts $ 4.2 $ 12.1