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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Aug. 31, 2015
Derivative [Line Items]      
Losses recorded to AOCI   $ 21.6  
Foreign exchange contracts | Designated as hedging instruments      
Derivative [Line Items]      
Period to settlement dates of derivatives is within this period 36 months 36 months  
Foreign exchange contracts | Derivatives not designated as hedging instruments      
Derivative [Line Items]      
Notional Amount $ 676.1 $ 920.0  
Forward Currency and Treasury Locks      
Derivative [Line Items]      
Notional Amount     $ 2,900.0
Forward Starting Interest Rate Swaps      
Derivative [Line Items]      
Derivative, Remaining Maturity (years)   10 years  
Foreign Exchange Option Contracts | Designated as hedging instruments      
Derivative [Line Items]      
Period to settlement dates of derivatives is within this period 51 months 36 months  
Minimum | Foreign exchange contracts      
Derivative [Line Items]      
Derivative, Remaining Maturity (years) 3 years    
Maximum | Foreign exchange contracts      
Derivative [Line Items]      
Derivative, Remaining Maturity (years) 5 years