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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
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Number of Shares  
Non-vested units (in shares) | shares 3,712
Granted (in shares) | shares 3,412
Vested (in shares) | shares (835)
Forfeited (in shares) | shares (449)
Non-vested units (in shares) | shares 5,840
Weighted Average Grant Date Fair Value  
Non-vested units (in dollars per share) | $ / shares $ 10.59
Granted (in dollars per share) | $ / shares 10.99
Vested (in dollars per share) | $ / shares 9.43
Forfeited (in dollars per share) | $ / shares 10.47
Non-vested units (in dollars per share) | $ / shares $ 11.06
Additional Disclosures  
Non-vested units, weighted average remaining years 2 years 6 months
Non-vested units, aggregate intrinsic value | $ $ 46.8