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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Jul. 01, 2020
Jun. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock options granted during the period (in shares)     498 725
Fair value per share (in dollars per share)     $ 94.69 $ 62.02
Cash received from exercise of options     $ 19.2 $ 22.9
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards granted during period (in shares)     207 179
Weighted average fair value per share of restricted stock awards granted during the period (in dollars per share)     $ 404.14 $ 340.92
Restricted stock awards vested during period (in shares)     116  
Weighted average grant date fair value per share (in dollars per share)     $ 311.33  
Weighted average vest date fair value per share (in dollars per share)     $ 394.23  
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% 10.00%    
Discount on the average closing price for the employee stock purchase plan 10.00% 5.00%    
Shares of stock purchased during the period by participants in the employee stock purchase plan (in shares)     13 8
Amount paid for stock purchased during the period by participants in the employee stock purchase plan     $ 4.7 $ 2.8