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Derivative Financial Instruments (Narrative) (Details) - Foreign exchange contracts - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Derivative, Notional Amount $ 85.5 $ 113.3
Cash Flow Hedging | Derivatives designated as hedging instruments    
Derivative [Line Items]    
Derivative, Notional Amount $ 103.7 $ 98.7