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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Foreign currency re-measurement exchange gains (losses) $ (0.1) $ (0.1) $ 0.1 $ (0.9)