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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, 2018
$ / shares
shares
Stock Options  
Unexercised options outstanding at the beginning of the period (in shares) | shares 0.6
Options granted (in shares) | shares 0.0
Options exercised (in shares) | shares (0.1)
Options forfeited (in shares) | shares 0.0
Unexercised options outstanding at the end of the period (in shares) | shares 0.5
Exercisable at the end of the period (in shares) | shares 0.1
Weighted Average Exercise Price  
Unexercised options outstanding at the beginning of the period (in dollars per share) | $ / shares $ 122.04
Options granted (in dollars per share) | $ / shares 179.54
Options exercised (in dollars per share) | $ / shares 100.00
Options forfeited (in dollars per share) | $ / shares 122.40
Unexercised options outstanding at the end of the period (in dollars per share) | $ / shares 130.30
Exercisable at the end of the period (in dollars per share) | $ / shares $ 136.33
Weighted Average Remaining Contractual Life (Years)  
Unexercised options outstanding at the end of the period (in years) 4 years
Exercisable at the end of the period (in years) 2 years 8 months 12 days