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Derivative Instruments, Cash Flow Hedges and Offsetting of Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivatives, Fair Value [Line Items]        
Maximum length of time hedged in cash flow hedge     1 year  
Foreign exchange contract [Member] | Cash flow hedging [Member]        
Derivatives, Fair Value [Line Items]        
Derivative instruments, gain (loss) recognized in other comprehensive income (loss), Effective portion $ (1.9) $ (2.8) $ (5.2) $ 1.7
Foreign exchange contract [Member] | Cash flow hedging [Member] | Operating expense [Member]        
Derivatives, Fair Value [Line Items]        
Derivative instruments, gain (loss) reclassified from accumulated OCI into operating expense, Effective portion $ (1.9) $ 1.5 $ (8.7) $ 5.0