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Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details)
shares in Millions
 3 Months Ended
Mar. 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 0.0
Unexercised options outstanding - ending balance (in shares) | shares 2.5
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 74.69
Options exercised (in dollars per share) | $ / shares 0
Options forfeited (in dollars per share) | $ / shares 122.40
Performance condition changes (in dollars per share) | $ / shares 0
Unexercised options outstanding - ending balance (in dollars per share) | $ / shares 84.53
Exercisable at the end of the period (in dollars per share) | $ / shares $ 131.55
Weighted Average Remaining Contractual Life (Years)  
Unexercised options outstanding - March 31, 2020 5 years 9 months 18 days
Exercisable at March 31, 2020 2 years 10 months 24 days