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Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details) - Stock Options
shares in Millions
 3 Months Ended
Mar. 31, 2017
$ / shares
shares
Stock Options  
Unexercised options outstanding at the beginning of the period (in shares) 1.4
Options granted (in shares) 0.0
Options exercised (in shares) (0.4)
Options forfeited (in shares) 0.0
Unexercised options outstanding at the end of the period (in shares) 1.0
Exercisable at the end of the period (in shares) 0.6
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 152.36
Options exercised (in dollars per share) | $ / shares 96.70
Options forfeited (in dollars per share) | $ / shares 142.19
Unexercised options outstanding at the end of the period (in dollars per share) | $ / shares 112.38
Exercisable at the end of the period (in dollars per share) | $ / shares $ 104.20
Weighted Average Remaining Contractual Life  
Unexercised options outstanding at the end of the period (in years) 3 years 1 month
Exercisable at the end of the period (in years) 1 year 5 months 15 days
Options outstanding with expiration dates prior year end 0.2