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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Designated as Hedging Instrument        
Derivative [Line Items]        
Foreign Exchange Forward Contracts Term     60 months  
Not Designated as Hedging Instrument        
Derivative [Line Items]        
Foreign Exchange Forward Contracts Term 6 months      
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (6.2) $ 1.4 $ 6.8 $ (1.2)
Foreign exchange forward contracts | Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount of derivative instruments 1,029.0   1,029.0  
Foreign exchange forward contracts | Designated as Hedging Instrument | Revenue        
Derivative [Line Items]        
Estimated gains (losses) to be reclassified from other comprehenisve income in next 12 months 13.6      
Foreign exchange forward contracts | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount of derivative instruments 1,253.0   1,253.0  
Foreign Exchange Forward, Open Expense | Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount of derivative instruments 10.0   $ 10.0  
Interest rate contracts | Designated as Hedging Instrument        
Derivative [Line Items]        
Estimated gains (losses) to be reclassified from other comprehenisve income in next 12 months $ 45.6