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Share-Based Compensation - Stock Options Outstanding (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding Options, Shares | shares 679,659
Outstanding Options, Weighted Average Remaining Contractual Life in Years 3 years 6 months 4 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 137.19
Exercisable Options, Shares | shares 410,897
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 100.03
$54.75 - 67.77  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 54.75
Range of Exercise Prices, maximum (usd per share) $ 67.77
Outstanding Options, Shares | shares 51,651
Outstanding Options, Weighted Average Remaining Contractual Life in Years 3 months 29 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 63.62
Exercisable Options, Shares | shares 51,651
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 63.62
67.78 - 79.77  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 67.78
Range of Exercise Prices, maximum (usd per share) $ 79.77
Outstanding Options, Shares | shares 98,097
Outstanding Options, Weighted Average Remaining Contractual Life in Years 1 year 3 months 29 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 71.11
Exercisable Options, Shares | shares 98,097
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 71.11
79.78 - 105.84  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 79.78
Range of Exercise Prices, maximum (usd per share) $ 105.84
Outstanding Options, Shares | shares 140,703
Outstanding Options, Weighted Average Remaining Contractual Life in Years 4 years 3 months 7 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 104.92
Exercisable Options, Shares | shares 62,996
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 104.70
105.85 - 108.59  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 105.85
Range of Exercise Prices, maximum (usd per share) $ 108.59
Outstanding Options, Shares | shares 116,254
Outstanding Options, Weighted Average Remaining Contractual Life in Years 2 years 3 months 29 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 107.95
Exercisable Options, Shares | shares 116,254
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 107.95
108.60 - 149.65  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 108.60
Range of Exercise Prices, maximum (usd per share) $ 149.65
Outstanding Options, Shares | shares 85,263
Outstanding Options, Weighted Average Remaining Contractual Life in Years 3 years 3 months 7 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 128.62
Exercisable Options, Shares | shares 59,319
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 128.27
149.66 - 173.94  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 149.66
Range of Exercise Prices, maximum (usd per share) $ 173.94
Outstanding Options, Shares | shares 2,939
Outstanding Options, Weighted Average Remaining Contractual Life in Years 5 years 5 months 5 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 169.49
Exercisable Options, Shares | shares 735
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 169.49
173.95 - 180.62  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 173.95
Range of Exercise Prices, maximum (usd per share) $ 180.62
Outstanding Options, Shares | shares 93,487
Outstanding Options, Weighted Average Remaining Contractual Life in Years 5 years 4 months 2 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 178.39
Exercisable Options, Shares | shares 20,531
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 178.39
180.63 - 283.09  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 180.63
Range of Exercise Prices, maximum (usd per share) $ 283.09
Outstanding Options, Shares | shares 4,588
Outstanding Options, Weighted Average Remaining Contractual Life in Years 5 years 11 months 27 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 219.46
Exercisable Options, Shares | shares 1,314
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 227.04
283.10 - 324.77  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (usd per share) 283.10
Range of Exercise Prices, maximum (usd per share) $ 324.77
Outstanding Options, Shares | shares 86,677
Outstanding Options, Weighted Average Remaining Contractual Life in Years 6 years 4 months 2 days
Outstanding Options, Weighted Average Exercise Price (usd per share) $ 305.96
Exercisable Options, Shares | shares 0
Exercisable Options, Weighted Average Exercise Price (usd per share) $ 0.00