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Stock-Based Compensation - Schedule of Stock-Based Compensation by Exercise Price Range (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
$41.78 - $60.80  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) $ 41.78
Exercise price, upper range limit (in dollars per share) $ 60.80
Outstanding options, number (in shares) | shares 121
Outstanding options, average exercise price (in dollars per share) $ 48.49
Outstanding options, average remaining life 9 months 12 days
Exercisable options, number (in shares) | shares 121
Exercisable options, average exercise price (in dollars per share) $ 48.49
$60.80 - $91.21  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 60.80
Exercise price, upper range limit (in dollars per share) $ 91.21
Outstanding options, number (in shares) | shares 149
Outstanding options, average exercise price (in dollars per share) $ 72.06
Outstanding options, average remaining life 2 years 2 months 12 days
Exercisable options, number (in shares) | shares 149
Exercisable options, average exercise price (in dollars per share) $ 72.06
$91.21 - $121.61  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 91.21
Exercise price, upper range limit (in dollars per share) $ 121.61
Outstanding options, number (in shares) | shares 359
Outstanding options, average exercise price (in dollars per share) $ 107.23
Outstanding options, average remaining life 3 years 6 months 6 days
Exercisable options, number (in shares) | shares 359
Exercisable options, average exercise price (in dollars per share) $ 107.23
$121.61 - $152.01  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 121.61
Exercise price, upper range limit (in dollars per share) $ 152.01
Outstanding options, number (in shares) | shares 436
Outstanding options, average exercise price (in dollars per share) $ 136.54
Outstanding options, average remaining life 5 years 24 days
Exercisable options, number (in shares) | shares 436
Exercisable options, average exercise price (in dollars per share) $ 136.54
$152.01 - $182.41  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 152.01
Exercise price, upper range limit (in dollars per share) $ 182.41
Outstanding options, number (in shares) | shares 783
Outstanding options, average exercise price (in dollars per share) $ 169.01
Outstanding options, average remaining life 6 years 9 months 24 days
Exercisable options, number (in shares) | shares 498
Exercisable options, average exercise price (in dollars per share) $ 167.63
$182.41 - $212.81  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 182.41
Exercise price, upper range limit (in dollars per share) $ 212.81
Outstanding options, number (in shares) | shares 534
Outstanding options, average exercise price (in dollars per share) $ 201.40
Outstanding options, average remaining life 8 years 1 month 18 days
Exercisable options, number (in shares) | shares 55
Exercisable options, average exercise price (in dollars per share) $ 186.22
$212.81 - $243.22  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 212.81
Exercise price, upper range limit (in dollars per share) $ 243.22
Outstanding options, number (in shares) | shares 97
Outstanding options, average exercise price (in dollars per share) $ 230.02
Outstanding options, average remaining life 8 years 6 months 10 days
Exercisable options, number (in shares) | shares 8
Exercisable options, average exercise price (in dollars per share) $ 227.94
$243.22 - $273.62  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 243.22
Exercise price, upper range limit (in dollars per share) $ 273.62
Outstanding options, number (in shares) | shares 27
Outstanding options, average exercise price (in dollars per share) $ 258.82
Outstanding options, average remaining life 9 years
Exercisable options, number (in shares) | shares 1
Exercisable options, average exercise price (in dollars per share) $ 260.01
$273.62 - $304.02  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 273.62
Exercise price, upper range limit (in dollars per share) $ 304.02
Outstanding options, number (in shares) | shares 699
Outstanding options, average exercise price (in dollars per share) $ 279.24
Outstanding options, average remaining life 9 years 2 months 15 days
Exercisable options, number (in shares) | shares 0
Exercisable options, average exercise price (in dollars per share) $ 0.00
$41.78 - 304.02  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower range limit (in dollars per share) 41.78
Exercise price, upper range limit (in dollars per share) $ 304.02
Outstanding options, number (in shares) | shares 3,205
Outstanding options, average exercise price (in dollars per share) $ 180.69
Outstanding options, average remaining life 6 years 7 months 6 days
Exercisable options, number (in shares) | shares 1,627
Exercisable options, average exercise price (in dollars per share) $ 129.39