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Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details)
shares in Millions
 6 Months Ended
Jun. 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 0.0
Options forfeited (in shares) | shares 0.0
Unexercised options outstanding at the end of the period (in shares) | shares 0.6
Exercisable at the end of the period (in shares) | shares 0.2
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 203.22
Options exercised (in dollars per share) | $ / shares 97.14
Options forfeited (in dollars per share) | $ / shares 122.40
Unexercised options outstanding at the end of the period (in dollars per share) | $ / shares 125.16
Exercisable at the end of the period (in dollars per share) | $ / shares $ 121.63
Weighted Average Remaining Contractual Life  
Unexercised options outstanding at the end of the period (in years) 3 years 7 months 6 days
Exercisable at the end of the period (in years) 1 year 9 months 18 days