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Long-term Incentive Compensation and Shareholders’ Equity - Summary of Range of Exercise Prices (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards outstanding (in shares) | shares 6,648,199
Weighted average exercise price (USD per share) $ 67.92
Awards exercisable (in shares) | shares 2,628,008
Weighted average exercise price (USD per share) $ 62.78
$50.01–$60.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards outstanding (in shares) | shares 1,856,145
Weighted average exercise price (USD per share) $ 59.05
Awards exercisable (in shares) | shares 1,712,675
Weighted average exercise price (USD per share) $ 59.15
Range of exercise prices, lower range (USD per share) 50.01
Range of exercise prices, upper range (USD per share) $ 60.00
$60.01–$70.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards outstanding (in shares) | shares 2,715,542
Weighted average exercise price (USD per share) $ 66.70
Awards exercisable (in shares) | shares 632,849
Weighted average exercise price (USD per share) $ 67.47
Range of exercise prices, lower range (USD per share) 60.01
Range of exercise prices, upper range (USD per share) $ 70.00
$70.01–$80.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards outstanding (in shares) | shares 1,443,749
Weighted average exercise price (USD per share) $ 74.77
Awards exercisable (in shares) | shares 243,041
Weighted average exercise price (USD per share) $ 73.16
Range of exercise prices, lower range (USD per share) 70.01
Range of exercise prices, upper range (USD per share) $ 60.00
$80.01–$90.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards outstanding (in shares) | shares 632,763
Weighted average exercise price (USD per share) $ 83.59
Awards exercisable (in shares) | shares 39,443
Weighted average exercise price (USD per share) $ 81.51
Range of exercise prices, lower range (USD per share) 80.01
Range of exercise prices, upper range (USD per share) $ 90.00