v3.26.1
Fair Value Measurements (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financial assets:    
Total financial assets $ 24.9 $ 23.2
Financial liabilities:    
Deferred compensation programs' liabilities 8.1 6.7
Total financial liabilities 8.1 6.7
Corporate bonds    
Financial assets:    
Trading debt securities: 3.2 3.6
Agency bonds    
Financial assets:    
Trading debt securities: 0.5 0.9
U.S. government securities    
Financial assets:    
Trading debt securities: 3.6 2.4
Agency collateralized mortgage obligations    
Financial assets:    
Trading debt securities: 8.7 8.5
Exchange traded funds    
Financial assets:    
Trading debt securities: 0.4 0.4
Mortgage backed securities    
Financial assets:    
Trading debt securities: 0.3 0.3
Other    
Financial assets:    
Trading debt securities: 0.3 0.3
Preferred stocks    
Financial assets:    
Trading equity securities: 0.3 0.3
Equity Funds    
Financial assets:    
Trading equity securities: 0.6 0.6
Supplemental Employee Retirement Plan and Non-Qualified Deferred Compensation Plan | Mutual Fund    
Financial assets:    
Trading equity securities: 7.0 5.9
Level 1    
Financial assets:    
Total financial assets 15.1 13.2
Financial liabilities:    
Deferred compensation programs' liabilities 0.0 0.0
Total financial liabilities 0.0 0.0
Level 1 | Corporate bonds    
Financial assets:    
Trading debt securities: 3.2 3.6
Level 1 | Agency bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | U.S. government securities    
Financial assets:    
Trading debt securities: 3.6 2.4
Level 1 | Agency collateralized mortgage obligations    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Exchange traded funds    
Financial assets:    
Trading debt securities: 0.4 0.4
Level 1 | Mortgage backed securities    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Other    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Preferred stocks    
Financial assets:    
Trading equity securities: 0.3 0.3
Level 1 | Equity Funds    
Financial assets:    
Trading equity securities: 0.6 0.6
Level 1 | Supplemental Employee Retirement Plan and Non-Qualified Deferred Compensation Plan | Mutual Fund    
Financial assets:    
Trading equity securities: 7.0 5.9
Level 2    
Financial assets:    
Total financial assets 9.8 10.0
Financial liabilities:    
Deferred compensation programs' liabilities 8.1 6.7
Total financial liabilities 8.1 6.7
Level 2 | Corporate bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Agency bonds    
Financial assets:    
Trading debt securities: 0.5 0.9
Level 2 | U.S. government securities    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Agency collateralized mortgage obligations    
Financial assets:    
Trading debt securities: 8.7 8.5
Level 2 | Exchange traded funds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Mortgage backed securities    
Financial assets:    
Trading debt securities: 0.3 0.3
Level 2 | Other    
Financial assets:    
Trading debt securities: 0.3 0.3
Level 2 | Preferred stocks    
Financial assets:    
Trading equity securities: 0.0 0.0
Level 2 | Equity Funds    
Financial assets:    
Trading equity securities: 0.0 0.0
Level 2 | Supplemental Employee Retirement Plan and Non-Qualified Deferred Compensation Plan | Mutual Fund    
Financial assets:    
Trading equity securities: $ 0.0 $ 0.0