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Share-Based Compensation - Transactions of the Company's Stock Options (Details)
shares in Millions
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stock Options  
Stock options outstanding at the beginning of the period (in shares) | shares 1.4
Options granted (in shares) | shares 0.0
Options exercised (in shares) | shares (0.7)
Options forfeited (in shares) | shares (0.1)
Stock options outstanding at the end of the period (in shares) | shares 0.6
Exercisable stock options, at the end of the period (in shares) | shares 0.2
Weighted Average Exercise Price  
Stock options outstanding, at the beginning of the period (in usd per share) | $ / shares $ 108.53
Options granted (in usd per share) | $ / shares 168.60
Options exercised (in usd per share) | $ / shares 97.54
Options forfeited (in usd per share) | $ / shares 140.26
Stock options outstanding, at the end of the period (in usd per share) | $ / shares 122.04
Exercisable stock options, at the end of the period (in usd per share) | $ / shares $ 115.74
Weighted Average Remaining Contractual Life (years)  
Stock options outstanding, at the end of the period (in years) 3 years 10 months 24 days
Exercisable stock options, at the end of the period (in years) 1 year 8 months 12 days