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Derivatives and Risk Management Narrative (Details) - Foreign Exchange Contract - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Foreign exchange and other gains (losses)          
Derivative [Line Items]          
Gain (loss) on derivative $ (11.7) $ 3.1 $ (4.8) $ 6.8  
Derivatives Not Designated as Hedging Instruments          
Derivative [Line Items]          
Notional amount $ 332.2   $ 332.2   $ 338.0