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Stock-Based Compensation - Summary of Changes in RSUs Outstanding (Details) - Restricted stock units
shares in Millions
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Restricted Stock Units (RSUs)  
Outstanding, Beginning Balance (in shares) 1.3
Granted (in shares) 0.5
Vested and released (in shares) (0.5)
Forfeited (in shares) (0.1)
Outstanding, Ending Balance (in shares) 1.2
Per Share Weighted Average Grant Date Fair Value  
Outstanding, Beginning Balance (in dollars per share) | $ / shares $ 118.89
Granted (in dollars per share) | $ / shares 152.17
Vested and released (in dollars per share) | $ / shares 111.62
Forfeited (in dollars per share) | $ / shares 132.31
Outstanding, Ending Balance (in dollars per share) | $ / shares $ 136.09
Weighted average remaining contractual term 1 year 1 month 6 days
Performance Shares  
Restricted Stock Units (RSUs)  
Granted (in shares) 0.1
Minimum | Performance Shares  
Per Share Weighted Average Grant Date Fair Value  
Performance shares, target performance percentage 0.00%
Maximum | Performance Shares  
Per Share Weighted Average Grant Date Fair Value  
Performance shares, target performance percentage 200.00%
Executives | Performance Shares  
Restricted Stock Units (RSUs)  
Granted (in shares) 0.2
Non-executive employees | Service-based Awards  
Restricted Stock Units (RSUs)  
Granted (in shares) 0.3