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Share based Compensation - RSUs and PBRSUs Summary (Details) - Unvested restricted stock units - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Non-vested units as of the beginning of the period (in shares) 7,080,000 5,792,000 3,712,000
Granted (in shares) 3,191,000 4,692,000 3,526,000
Vested (in shares) (1,863,436) (2,164,000) (921,000)
Forfeited (in shares) (1,067,000) (1,240,000) (525,000)
Non-vested units as of the end of the period (in shares) 7,341,000 7,080,000 5,792,000
Weighted Average Grant Date Fair Value      
Non-vested units as of the beginning of the period (in dollars per share) $ 11.35 $ 11.18 $ 10.59
Granted (in dollars per share) 16.94 11.29 10.92
Vested (in dollars per share) 15.77 10.70 8.49
Forfeited (in dollars per share) 12.82 11.14 10.52
Non-vested units as of the end of the period (in dollars per share) $ 13.90 $ 11.35 $ 11.18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Non-vested units, weighted average remaining years 2 years 3 months 18 days    
Non-vested units, aggregate intrinsic value $ 84.8