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Stock Based Compensation - Changes in Option Awards All of Which Related to Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Number of Options      
Outstanding at beginning of year (in shares) 1,395,841 1,872,553 2,481,606
Exercised (in shares) (83,712) (473,452) (600,344)
Forfeited (in shares) (15,300) (3,260) (8,709)
Outstanding at end of year (in shares) 1,296,829 1,395,841 1,872,553
Number of options, exercisable at end of year (in shares) 1,296,829 1,295,061 1,549,749
Weighted Avg. Per Share Exercise Price      
Outstanding at beginning of year (in dollars per share) $ 55.07 $ 52.93 $ 51.22
Exercised (in dollars per share) 39.60 46.46 45.68
Forfeited (in dollars per share) 53.00 74.27 66.96
Outstanding at end of year (in dollars per share) 56.10 55.07 52.93
Weighted-avg. per share exercise price, exercisable at end of year (in dollars per share) $ 56.10 $ 53.59 $ 49.51
Intrinsic value of options exercised $ 2.0 $ 18.0 $ 15.0
Weighted average remaining contractual life of options outstanding 5 years 6 years 7 years
Aggregate intrinsic value of options outstanding $ 16.0    
Weighted average remaining contractual life of options exercisable 5 years 6 years 6 years
Aggregate intrinsic value of options exercisable $ 16.0