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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, 2015
$ / shares
shares
Stock Options  
Unexercised options outstanding at the beginning of the period (in shares) 2.3
Options granted (in shares) 0.0
Options exercised (in shares) (0.9)
Options forfeited (in shares) 0.0
Unexercised options outstanding at the end of the period (in shares) 1.4
Exercisable at the end of the period (in shares) 1.3
Weighted Average Exercise Price  
Unexercised options outstanding at the beginning of the period (in dollars per share) | $ / shares $ 83.42
Options granted (in dollars per share) | $ / shares 207.61
Options exercised (in dollars per share) | $ / shares 65.45
Options forfeited (in dollars per share) | $ / shares 101.29
Unexercised options outstanding at the end of the period (in dollars per share) | $ / shares 95.34
Exercisable at the end of the period (in dollars per share) | $ / shares $ 92.18
Weighted Average Remaining Contractual Life  
Unexercised options outstanding at the end of the period (in years) 2 years 3 months 12 days
Exercisable at the end of the period (in years) 2 years 2 months 18 days