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Share-Based Compensation - Schedule of Transactions of the Company's Stock Options (Details) - Stock Options and Other Awards
shares in Millions
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Stock Options  
Stock options outstanding at the beginning of the period (options) | shares 2.3
Options granted | shares 0.0
Options exercised | shares (0.9)
Options forfeited | shares 0.0
Stock options outstanding at the end of the period (options) | shares 1.4
Exercisable stock options, at the end of the period (options) | shares 1.3
Weighted Average Exercise Price  
Stock options outstanding, at the beginning of the period (in usd per option) | $ / shares $ 83.42
Options granted | $ / shares 207.61
Options exercised | $ / shares 65.95
Options forfeited | $ / shares 101.29
Stock options outstanding, at the end of the period (in usd per option) | $ / shares 96.18
Exercisable stock options, at the end of the period (in usd per option) | $ / shares $ 94.43
Weighted Average Remaining Contractual Life (years)  
Stock options outstanding, at the end of the period (in years) 2 years 2 months 12 days
Exercisable stock options, at the end of the period (in years) 2 years 1 month 6 days