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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Foreign currency re-measurement exchange gains (losses) $ (1.0) $ (0.2) $ (3.2)