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Share-Based Compensation - RSUs and PBRSUs Summary (Details) - Unvested restricted stock units
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Number of Shares  
Non-vested units (in shares) | shares 7,080
Granted (in shares) | shares 2,451
Vested (in shares) | shares (1,513)
Forfeited (in shares) | shares (606)
Non-vested units (in shares) | shares 7,412
Weighted Average Grant Date Fair Value  
Non-vested units (in dollars per share) | $ / shares $ 11.35
Granted (in dollars per share) | $ / shares 18.89
Vested (in dollars per share) | $ / shares 16.81
Forfeited (in dollars per share) | $ / shares 13.77
Non-vested units (in dollars per share) | $ / shares $ 13.96
Additional Disclosures  
Non-vested units, weighted average remaining years 2 years 6 months
Non-vested units, aggregate intrinsic value | $ $ 71.5