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Stock Based Compensation - Stock Options, Restricted Stock and Restricted Stock Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Number of Options    
Balance at beginning of period (shares) 7,650,000  
Granted (shares) 0  
Forfeited (shares) 0  
Vested (shares) 0  
Balance at end of period (shares) 7,650,000 7,650,000
Weighted-Average Exercise price    
Balance at beginning of period (USD per share) $ 22.00  
Granted (USD per share) 0  
Forfeited (USD per share) 0  
Vested (USD per share) 0  
Balance at end of period (USD per share) $ 22.00 $ 22.00
Weighted Average Remaining Contractual Term (in years) of options outstanding 6 years 3 months 18 days 6 years 6 months
Aggregate intrinsic value of options outstanding $ 13.8 $ 22.2
Restricted stock and restricted stock units    
Shares    
Balance at beginning of period (shares) 702,899  
Granted (shares) 2,349,641  
Forfeited (shares) (61,496)  
Vested (shares) (161,438)  
Balance at end of period (shares) 2,829,606 702,899
Weighted-Average Grant Date Fair Value    
Balance at beginning of period (USD per share) $ 25.95  
Granted (USD per share) 22.04  
Forfeited (USD per share) 25.21  
Vested (USD per share) 25.59  
Balance at end of period (USD per share) $ 22.74 $ 25.95
Weighted Average Remaining Contractual Term (in years) 1 year 9 months 18 days 1 year 3 months 18 days
Aggregate intrinsic value of equity instruments other than options outstanding $ 67.4 $ 17.5