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Share-Based Compensation - RSUs and PBRSUs Summary (Details) - Unvested restricted stock units
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of Shares  
Non-vested units (in shares) | shares 7,080
Granted (in shares) | shares 2,790
Vested (in shares) | shares (1,555)
Forfeited (in shares) | shares (775)
Non-vested units (in shares) | shares 7,540
Weighted Average Grant Date Fair Value  
Non-vested units (in dollars per share) | $ / shares $ 11.35
Granted (in dollars per share) | $ / shares 17.77
Vested (in dollars per share) | $ / shares 16.67
Forfeited (in dollars per share) | $ / shares 13.45
Non-vested units (in dollars per share) | $ / shares $ 13.81
Additional Disclosures  
Non-vested units, weighted average remaining years 2 years 4 months 24 days
Non-vested units, aggregate intrinsic value | $ $ 72.0