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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee stock options granted during the period (in shares) 725 686
Fair value per share (in dollars per share) $ 62.02 $ 67.61
Cash received from exercise of options $ 22.9 $ 36.8
Restricted Stock Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards granted during period (in shares) 179 258
Weighted average fair value per share of restricted stock awards granted during the period (in dollars per share) $ 340.92 $ 309.02
Restricted stock awards vested during period (in shares) 96  
Weighted average grant date fair value per share (in dollars per share) $ 248.05  
Weighted average vest date fair value per share (in dollars per share) $ 333.75  
Employee Stock Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of eligible earnings to purchase common stock through the employee stock purchase plan 10.00%  
Discount on the average closing price for the employee stock purchase plan 5.00%  
Shares of stock purchased during the period by participants in the employee stock purchase plan (in shares) 8 8
Amount paid for stock purchased during the period by participants in the employee stock purchase plan $ 2.8 $ 2.2