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Equity-Based Compensation Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reversal of equity-based compensation expense $ (191.5) $ (147.0) $ (125.5)  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense $ 17.0      
Weighted average recognition period 2 years 1 month 6 days      
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense $ 284.2      
Weighted average recognition period 2 years 6 months      
Performance Shares | Restatement Adjustment        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reversal of equity-based compensation expense   $ 15.6    
2015 Equity Incentive Plan | Stock Compensation Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares rolled over (in shares) 27,340,000      
2015 Equity Incentive Plan | Class A Common Stock | Stock Compensation Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional capital shares reserved for future issuance (in shares)       6,794,000
2015 Employee Stock Purchase Plan | Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares rolled over (in shares) 4,081,000      
2015 Employee Stock Purchase Plan | Class A Common Stock | Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional capital shares reserved for future issuance (in shares)       1,000,000