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Share-Based Compensation - Schedule of the Transactions of the Company's Stock Options (Details) - Stock Options
shares in Millions
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Stock Options  
Unexercised options outstanding at the beginning of the period (in shares) | shares 1.4
Options granted (in shares) | shares 0.4
Options exercised (in shares) | shares (0.1)
Unexercised options outstanding at the end of the period (in shares) | shares 1.7
Exercisable at the end of the period (in shares) | shares 1.2
Weighted Average Exercise Price  
Unexercised options outstanding at the beginning of the period (in dollars per share) | $ / shares $ 96.18
Options granted (in dollars per share) | $ / shares 122.40
Options exercised (in dollars per share) | $ / shares 77.77
Unexercised options outstanding at the end of the period (in dollars per share) | $ / shares 103.78
Exercisable at the end of the period (in dollars per share) | $ / shares $ 95.93
Weighted Average Remaining Contractual Life  
Unexercised options outstanding at the end of the period (in years) 2 years 10 months 12 days
Exercisable at the end of the period (in years) 1 year 8 months 18 days