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Stock Based Compensation - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 07, 2019
USD ($)
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
profitInterestUnit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock authorized for issuance (shares) | shares   40,000,000   40,000,000  
Stock available for grant (shares) | shares   31,498,741   31,498,741  
Total compensation expense for stock options granted $ 11.7 $ 9.7 $ 3.6 $ 38.6 $ 7.9
Accelerated recognition of equity-based compensation $ 10.4 $ 3.4   $ 3.4  
Profit Interest Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation expense for stock options granted         $ 55.3
Class B Profit Interest Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of profit interest units granted (shares) | profitInterestUnit         6,817.74280
Class C Profit Interest Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of profit interest units granted (shares) | profitInterestUnit         15,867.80780