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Derivatives Instruments and Hedging Activities - Cash Flow Hedging Strategy (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Derivatives not designated as hedging instruments: $ 1.2 $ (2.9) $ 0.5 $ (1.1)