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Stock Plans - RSAs, RSUs, PSAs and PSUs (Details) - RSAs, RSUs, PSAs and PSUs - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Outstanding at the beginning of the period (in shares) 2,257 2,218 1,880
Granted (in shares) 1,054 1,107 1,257
Performance award adjustments (in shares) (51) (25) (5)
Vested (in shares) (798) (768) (523)
Forfeited (in shares) (422) (275) (391)
Outstanding at the end of the period (in shares) 2,040 2,257 2,218
Weighted Average Grant Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 16.20 $ 20.74 $ 25.41
Granted (in dollars per share) 9.53 11.53 17.37
Performance award adjustments (in dollars per share) 30.94 28.91 32.67
Vested (in dollars per share) 16.01 21.77 26.39
Forfeited (in dollars per share) 14.87 18.48 24.66
Outstanding at the end of the period (in dollars per share) $ 12.73 $ 16.20 $ 20.74
Total fair value of shares vested $ 9.0 $ 8.8 $ 9.1
Minimum      
Weighted Average Grant Date Fair Value      
Vesting period 1 year    
Maximum      
Weighted Average Grant Date Fair Value      
Vesting period 4 years