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Stock-Based Compensation - Summary of Changes in RSUs Outstanding (Details)
shares in Millions
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Per Share Weighted Average Grant Date Fair Value  
Weighted average remaining contractual term 1 year 1 month 6 days
Restricted stock units  
Restricted Stock Units (RSUs)  
Outstanding, Beginning Balance (in shares) 1.4
Granted (in shares) 0.5
Vested and released (in shares) (0.5)
Forfeited (in shares) (0.1)
Outstanding, Ending Balance (in shares) 1.3
Per Share Weighted Average Grant Date Fair Value  
Outstanding, Beginning Balance (in dollars per share) | $ / shares $ 101.75
Granted (in dollars per share) | $ / shares 139.86
Vested and released (in dollars per share) | $ / shares 97.33
Forfeited (in dollars per share) | $ / shares 116.79
Outstanding, Ending Balance (in dollars per share) | $ / shares $ 118.89
Performance Shares | Restricted stock units  
Restricted Stock Units (RSUs)  
Granted (in shares) 0.1
Per Share Weighted Average Grant Date Fair Value  
Performance share, actual yielded performance, percent 142.00%
Minimum | Performance Shares | Restricted stock units  
Per Share Weighted Average Grant Date Fair Value  
Performance shares, target performance percentage 0.00%
Maximum | Performance Shares | Restricted stock units  
Per Share Weighted Average Grant Date Fair Value  
Performance shares, target performance percentage 200.00%
Executives | Performance Shares | Restricted stock units  
Restricted Stock Units (RSUs)  
Granted (in shares) 0.2
Non-executive employees | Service-based Awards | Restricted stock units  
Restricted Stock Units (RSUs)  
Granted (in shares) 0.3