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Stock-Based Compensation - RSU Activity (Details) - RSUs
shares in Millions
6 Months Ended
Jun. 30, 2021
$ / shares
shares
RSUs, Number of shares  
RSUs outstanding, beginning (shares) | shares 3.2
RSUs granted (shares) | shares 1.5
RSUs vested (shares) | shares (0.1)
RSUs canceled (shares) | shares (0.6)
RSUs outstanding, ending (shares) | shares 4.0
RSUs, Weighted average grant date fair value  
RSUs outstanding, beginning (dollars per share) | $ / shares $ 20.56
RSUs granted (dollars per share) | $ / shares 29.89
RSUs vested (dollars per share) | $ / shares 18.88
RSUs canceled (dollars per share) | $ / shares 24.54
RSUs outstanding, ending (dollars per share) | $ / shares $ 23.72