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Summary of Significant Accounting Policies - Foreign Currency Remeasurement and Translation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]        
Foreign currency translation gain (loss) $ (3.8) $ 3.3 $ 1.0 $ 6.7