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Employee Benefit Plans - Stock Incentive Plans Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 17, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 01, 2019
Dec. 01, 2017
Time Based Vesting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Time-vesting awards, portion to be vested per year   25.00%        
Vesting period   4 years        
2017 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted in period under equity incentive plan 189,499          
Shares cancelled under equity incentive plan   575,506        
Shares withheld for payment of taxes   215,900        
2019 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period   1 year        
2019 Equity Incentive Plan | Class A common stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant   10,501,907     9,900,000  
RSUs | Performance Based Vesting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period   3 years        
RSUs | Time Based Vesting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant   1,150,761 1,493,788 1,332,085    
Percentage of target restricted stock unit   33.30%        
RSUs | Total Shareholder Return            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of target restricted stock unit   33.30%        
Measurement period   6 years        
Number of trading days required for purposes of measuring shareholder return based on average closing price of common stock immediately preceding grant date   60 days        
RSUs | Earnings Per Share Performance            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of target restricted stock unit   33.30%        
Measurement period   6 years        
RSUs | Maximum | Performance Based Vesting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant   910,346 888,726 1,014,269    
RSUs | 2012 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant   310,023        
RSUs | 2017 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance   4,677,453        
RSUs | 2017 Equity Incentive Plan | Time Based Vesting | Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant   55,973       939,605,000
RSUs | 2017 Equity Incentive Plan | Maximum | Performance Based Vesting | Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant   195,907       3,288,618,000
Stock Options | 2019 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grant   6,265,195        
Non-Vested Stock Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense related to non-vested awards   $ 60.4 $ 127.7 $ 128.2    
Unrecognized estimated compensation cost   $ 121.1        
Weighted average period of recognition   2 years 7 months 6 days