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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, 2016
$ / shares
shares
Stock Options  
Stock 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 (0.4)
Options forfeited (in shares) | shares 0.0
Stock options outstanding at the end of the period (in shares) | shares 1.4
Exercisable stock options, at the end of the period (in shares) | shares 0.9
Weighted Average Exercise Price  
Stock options outstanding, at the beginning of the period (in usd per share) | $ / shares $ 96.18
Options granted (in usd per share) | $ / shares 122.82
Options exercised (in usd per share) | $ / shares 81.08
Options forfeited (in usd per share) | $ / shares 131.91
Stock options outstanding, at the end of the period (in usd per share) | $ / shares 108.53
Exercisable stock options, at the end of the period (in usd per share) | $ / shares $ 101.38
Weighted Average Remaining Contractual Life (years)  
Stock options outstanding, at the end of the period (in years) 2 years 9 months
Exercisable stock options, at the end of the period (in years) 1 year 3 months