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Summary of Significant Accounting Policies - Foreign Currency Translation and Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (loss) from foreign currency transactions   $ (1.5) $ (0.2)
Maximum      
Gain (loss) from foreign currency transactions $ 0.1