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Share-Based Compensation - Transactions of the Company's Stock Options (Details)
shares in Millions
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Stock  Options  
Unexercised options outstanding - beginning balance (in shares) | shares 2.3
Options granted (in shares) | shares 0.2
Options exercised (in shares) | shares (0.0)
Options forfeited (in shares) | shares (0.0)
Performance condition changes (in shares) | shares 0.4
Unexercised options outstanding - ending balance (in shares) | shares 2.9
Stock Options, Exercisable at the end of the period (in shares) | shares 0.4
Weighted Average Exercise Price  
Unexercised options outstanding - beginning balance (in dollars per share) | $ / shares $ 85.58
Options granted (in dollars per share) | $ / shares 74.31
Options exercised (in dollars per share) | $ / shares 86.78
Options forfeited (in dollars per share) | $ / shares 147.77
Performance condition changes (in dollars per share) | $ / shares 74.42
Unexercised stock options outstanding - ending balance (in dollars per share) | $ / shares 82.14
Weighted Average Exercise Price, Exercisable at the end of the period (in dollars per share) | $ / shares $ 126.95
Weighted Average Remaining Contractual Life (Years)  
Unexercised options outstanding at the end of the period 5 years 1 month 6 days
Exercisable at the end of the period 1 year 8 months 12 days