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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, 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 0.0
Unexercised options outstanding - ending balance (in shares) | shares 2.5
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 74.29
Options exercised (in dollars per share) | $ / shares 0
Options forfeited (in dollars per share) | $ / shares 128.20
Performance condition changes (in dollars per share) | $ / shares 0
Unexercised options outstanding - ending balance (in dollars per share) | $ / shares 84.03
Weighted Average Exercise Price, Exercisable at the end of the period (in dollars per share) | $ / shares $ 128.91
Weighted Average Remaining Contractual Life (Years)  
Unexercised options outstanding at the end of the period 5 years 2 months 12 days
Exercisable at the end of the period 1 year 10 months 24 days