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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]        
Foreign currency translation gain (loss) $ 1.0 $ (3.8) $ (2.2) $ 1.0