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Stock-Based Compensation - Stock Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]        
Employee stock compensation $ 0.3 $ 0.9 $ 1.0 $ 1.8