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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Net gains (losses) on derivatives not designated as hedging instruments $ (1.5) $ (0.2)