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Derivative Financial Instruments (Narrative) (Details) - Foreign exchange contracts - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Derivative, Notional Amount $ 171.0 $ 182.6
Cash Flow Hedging | Derivatives designated as hedging instruments    
Derivative [Line Items]    
Derivative, Notional Amount $ 108.4 $ 96.7