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Share-Based Compensation - RSUs and PBRSUs Summary (Details) - Unvested restricted stock units - Stock Option Plan Amended Restated 2007 Equity Incentive Plan
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Shares  
Non-vested units (in shares) | shares 7,080
Granted (in shares) | shares 2,131
Vested (in shares) | shares (1,435)
Forfeited (in shares) | shares (310)
Non-vested units (in shares) | shares 7,466
Weighted Average Grant Date Fair Value  
Non-vested units (in dollars per share) | $ / shares $ 11.35
Granted (in dollars per share) | $ / shares 20.22
Vested (in dollars per share) | $ / shares 17.38
Forfeited (in dollars per share) | $ / shares 13.36
Non-vested units (in dollars per share) | $ / shares $ 14.14
Additional Disclosures  
Non-vested units, weighted average remaining years 2 years 8 months 12 days
Non-vested units, aggregate intrinsic value | $ $ 73.8