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Stock Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended
Jul. 01, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock options granted during the period (in shares)     504 735
Fair value per share (in dollars per share)     $ 94.81 $ 62.30
Cash received from exercise of options     $ 61.1 $ 63.0
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards granted during period (in shares)     216 191
Weighted average fair value per share of restricted stock awards granted during the period (in dollars per share)     $ 406.38 $ 344.16
Restricted stock awards vested during period (in shares)     133  
Weighted average grant date fair value per share (in dollars per share)     $ 314.99  
Weighted average vest date fair value per share (in dollars per share)     $ 399.74  
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%   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)     22 14
Amount paid for stock purchased during the period by participants in the employee stock purchase plan     $ 8.2 $ 4.5