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Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details) - Stock Options
shares in Millions
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Stock Options  
Unexercised options outstanding at the beginning of the period (in shares) | shares 1.4
Options granted (in shares) | shares 0.0
Options exercised (in shares) | shares (0.6)
Options forfeited (in shares) | shares (0.1)
Unexercised options outstanding at the end of the period (in shares) | shares 0.7
Exercisable at the end of the period (in shares) | shares 0.3
Weighted Average Exercise Price  
Unexercised options outstanding at the beginning of the period (in dollars per share) | $ / shares $ 108.53
Options granted (in dollars per share) | $ / shares 168.60
Options exercised (in dollars per share) | $ / shares 96.86
Options forfeited (in dollars per share) | $ / shares 140.26
Unexercised options outstanding at the end of the period (in dollars per share) | $ / shares 118.35
Exercisable at the end of the period (in dollars per share) | $ / shares $ 108.55
Weighted Average Remaining Contractual Life  
Unexercised options outstanding at the end of the period (in years) 3 years 6 months
Exercisable at the end of the period (in years) 1 year 6 months