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Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details)
shares in Millions
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Stock Options  
Unexercised options outstanding - beginning balance (in shares) | shares 2.9
Options granted (in shares) | shares 0.0
Options exercised (in shares) | shares (0.2)
Options forfeited (in shares) | shares (0.0)
Performance condition changes (in shares) | shares 0.6
Unexercised options outstanding - ending balance (in shares) | shares 3.3
Stock Options, Exercisable at the end of the period (in shares) | shares 0.2
Weighted Average Exercise Price  
Unexercised options outstanding - beginning balance (in dollars per share) | $ / shares $ 82.14
Options granted (in dollars per share) | $ / shares 150.68
Options exercised (in dollars per share) | $ / shares 120.12
Options forfeited (in dollars per share) | $ / shares 154.44
Performance condition changes (in dollars per share) | $ / shares 74.42
Unexercised options outstanding - ending balance (in dollars per share) | $ / shares 78.21
Weighted Average Exercise Price, Exercisable at the end of the period (in dollars per share) | $ / shares $ 131.74
Weighted Average Remaining Contractual Life (Years)  
Unexercised options outstanding at the end of the period 4 years 9 months 18 days
Exercisable at the end of the period 1 year 7 months 6 days