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Fair Value Measurements (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Financial assets:    
Total financial assets $ 22.1 $ 21.9
Financial liabilities:    
Deferred compensation programs' liabilities 6.4 6.1
Total financial liabilities 6.4 6.1
Corporate bonds    
Financial assets:    
Trading debt securities: 3.1 3.2
Agency bonds    
Financial assets:    
Trading debt securities: 1.5 1.5
U.S. government securities    
Financial assets:    
Trading debt securities: 1.9 2.4
Asset-backed securities    
Financial assets:    
Trading debt securities: 7.6 7.1
Exchange traded funds    
Financial assets:    
Trading debt securities: 0.8 0.8
Mortgage backed securities    
Financial assets:    
Trading debt securities: 0.4 0.4
Other    
Financial assets:    
Trading debt securities: 0.6 0.5
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: 5.3 5.1
Level 1    
Financial assets:    
Total financial assets 12.3 12.6
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: 3.1 3.2
Level 1 | Agency bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | U.S. government securities    
Financial assets:    
Trading debt securities: 1.9 2.4
Level 1 | Asset-backed securities    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Exchange traded funds    
Financial assets:    
Trading debt securities: 0.8 0.8
Level 1 | Mortgage backed securities    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Other    
Financial assets:    
Trading debt securities: 0.3 0.2
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: 5.3 5.1
Level 2    
Financial assets:    
Total financial assets 9.8 9.3
Financial liabilities:    
Deferred compensation programs' liabilities 6.4 6.1
Total financial liabilities 6.4 6.1
Level 2 | Corporate bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Agency bonds    
Financial assets:    
Trading debt securities: 1.5 1.5
Level 2 | U.S. government securities    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Asset-backed securities    
Financial assets:    
Trading debt securities: 7.6 7.1
Level 2 | Exchange traded funds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Mortgage backed securities    
Financial assets:    
Trading debt securities: 0.4 0.4
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