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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum percentage of common stock outstanding allowed for awards       10.00%      
Options granted (in shares)       1,449,779 0 108,288  
Number of shares outstanding which vested (in shares)       2,249,611 1,228,399 3,832,424 4,122,910
Fair value of vested options       $ 0.4 $ 1.2 $ 0.6  
Unrecognized compensation expense       $ 20.0 $ 0.9    
Weighted-average exercise price of non-vested awards (in usd per share)       $ 8.87 $ 2.86    
Weighted-average remaining contractual term of outstanding awards       6 years 6 months 2 years 8 months 12 days    
Intrinsic value of options exercised       $ 2.2 $ 20.7 4.4  
Intrinsic value of options outstanding       5.8      
Excess tax benefits from share based compensation       $ 5.2 $ (0.1) 1.0  
Class A-1 Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   4 years 5 years        
Options granted (in shares)   200,000 1,200,000        
Key Employees              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares outstanding which vested (in shares)       216,575 80,098    
Weighted-average remaining contractual term       1 year 7 months 6 days 1 year 10 months 24 days    
Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         0 years    
Percentage of fair market value of common stock (not less than)       100.00%      
Award termination period       10 years      
Stock option compensation expense       $ 5.5 $ 2.2 $ 0.5  
Options | Long Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period 10 years            
Options | Class A-1 Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, number of shares authorized (in shares) 6,000,000            
Options | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       4 years   3 years  
Options | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       5 years   5 years  
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted (in shares)   1,700,000   1,665,968      
Estimated grant date fair value of options and RSUs granted during period       $ 25.1      
Restricted Stock Units (RSUs) | Minimum | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   6 months          
Restricted Stock Units (RSUs) | Minimum | Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   1 year          
Restricted Stock Units (RSUs) | Maximum | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   1 year          
Restricted Stock Units (RSUs) | Maximum | Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   5 years