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Stock Based Compensation (Schedule of Company's Outstanding Performance Share Units) (Details) - Long-Term Equity Incentive Plan - Performance Share Units - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted Stock Units      
Shares outstanding, Beginning Balance (in shares) 640,166    
Grants (in shares) 268,897    
Vests (in shares) (231,354)    
Performance adjustment (in shares) (47,161)    
Forfeitures (in shares) (31,793)    
Shares outstanding, Ending Balance (in shares) 598,755 640,166  
Weighted-Average Grant-Date Fair Value      
Weighted-average grant-date fair value, shares outstanding, beginning balance (in dollars per share) $ 139.01    
Grants, weight-average grant-date fair value (in dollars per share) 114.91 $ 217.33 $ 148.04
Vests, weighted-average grant-date fair value (in dollars per share) 86.55    
Performance adjustment, weighted-average grant-date fair value (in dollars per share) 92.45    
Forfeitures, weighted-average grant-date fair value (in dollars per share) 149.27    
Weighted-average grant-date fair value, shares outstanding, ending balance (in dollars per share) $ 151.63 $ 139.01  
Fair value of shares vested during the period (in dollars per share) $ 25.8 $ 42.8 $ 24.6