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Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative Instruments (Textual) [Abstract]          
Lower range of durations of foreign currency forward contracts     1 month   1 month
Higher range of durations of foreign currency forward contracts     18 months   15 months
Gain/Loss on fair value of foreign currency forward contracts $ 63.1   $ 63.1   $ 72.1
Expected settlement time for contracts, in months     18 months    
Net gains (losses) of other income (expense) related to foreign currency forward contracts 13.6 $ 2.4 $ 3.9 $ 3.8  
Designated as hedging instrument          
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 1,517.0   1,517.0   1,302.3
Not designated as hedging instrument          
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 472.4   472.4   365.2
Foreign Exchange Contract | Other current assets | Designated as hedging instrument          
Summary of Derivatives designated as Hedging Instruments          
Derivative asset, fair value, net 92.8   92.8   69.5
Foreign Exchange Contract | Other current assets | Not designated as hedging instrument          
Summary of Derivatives designated as Hedging Instruments          
Derivative asset, fair value, net 7.7   7.7   1.3
Foreign Exchange Contract | Investments and other assets | Designated as hedging instrument          
Summary of Derivatives designated as Hedging Instruments          
Derivative asset, fair value, net         1.9
Foreign Exchange Contract | Accrued expenses and other | Designated as hedging instrument          
Summary of Derivatives designated as Hedging Instruments          
Derivative liability, fair value, net 9.8   9.8    
Foreign Exchange Contract | Accrued expenses and other | Not designated as hedging instrument          
Summary of Derivatives designated as Hedging Instruments          
Derivative liability, fair value, net 0.7   0.7   5.4
Foreign Exchange Contract | Other long-term liabilities | Designated as hedging instrument          
Summary of Derivatives designated as Hedging Instruments          
Derivative liability, fair value, net 17.2   17.2    
Revenue | Foreign Exchange Contract          
Derivative Instruments (Textual) [Abstract]          
Net gains (losses) in product revenue for the settlement of certain effective cash flow hedge instruments 40.4 (5.2) 75.4 (10.0)  
Other income (expense) | Foreign Exchange Contract          
Derivative Instruments (Textual) [Abstract]          
Net gains (losses) in earnings of Foreign currency forward contracts due to hedge ineffectiveness 1.2 $ (1.0) 3.4 $ (1.2)  
Euro | Designated as hedging instrument          
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 1,437.2   1,437.2   1,174.6
Canadian Dollar | Designated as hedging instrument          
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 32.1   32.1   56.7
British Pound Sterling | Designated as hedging instrument          
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 21.9   21.9   34.5
Japanese Yen | Designated as hedging instrument          
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount 15.5   15.5   16.6
Australian Dollar | Designated as hedging instrument          
Derivative Instruments (Textual) [Abstract]          
Aggregate notional amount $ 10.3   $ 10.3   $ 19.9