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Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measure on Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Financial assets:    
Derivative financial instruments $ 0.1  
Total financial assets 20.6 $ 19.0
Financial liabilities:    
Derivative financial instruments 0.1  
Deferred compensation programs' liabilities 6.1 5.7
Total financial liabilities 6.2 5.7
Corporate bonds    
Financial assets:    
Trading debt securities: 4.3 5.0
Municipal bonds    
Financial assets:    
Trading debt securities: 0.4 0.3
Agency bonds    
Financial assets:    
Trading debt securities: 2.2  
Floating rate notes    
Financial assets:    
Trading debt securities: 0.1 0.2
U.S. government securities    
Financial assets:    
Trading debt securities: 1.9 0.8
Asset-backed securities    
Financial assets:    
Trading debt securities: 3.8 5.4
Other    
Financial assets:    
Trading debt securities: 2.0 2.0
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 | Mutual Fund    
Financial assets:    
Trading equity securities: 4.9 4.4
Level 1    
Financial assets:    
Derivative financial instruments 0.0  
Total financial assets 13.5 12.6
Financial liabilities:    
Derivative financial instruments 0.0  
Deferred compensation programs' liabilities 0.0 0.0
Total financial liabilities 0.0 0.0
Level 1 | Corporate bonds    
Financial assets:    
Trading debt securities: 4.3 5.0
Level 1 | Municipal bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Agency bonds    
Financial assets:    
Trading debt securities: 0.0  
Level 1 | Floating rate notes    
Financial assets:    
Trading debt securities: 0.1 0.2
Level 1 | U.S. government securities    
Financial assets:    
Trading debt securities: 1.9 0.8
Level 1 | Asset-backed securities    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Other    
Financial assets:    
Trading debt securities: 1.4 1.3
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 | Mutual Fund    
Financial assets:    
Trading equity securities: 4.9 4.4
Level 2    
Financial assets:    
Derivative financial instruments 0.1  
Total financial assets 7.1 6.4
Financial liabilities:    
Derivative financial instruments 0.1  
Deferred compensation programs' liabilities 6.1 5.7
Total financial liabilities 6.2 5.7
Level 2 | Corporate bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Municipal bonds    
Financial assets:    
Trading debt securities: 0.4 0.3
Level 2 | Agency bonds    
Financial assets:    
Trading debt securities: 2.2  
Level 2 | Floating rate notes    
Financial assets:    
Trading debt securities: 0.0 0.0
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: 3.8 5.4
Level 2 | Other    
Financial assets:    
Trading debt securities: 0.6 0.7
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 | Mutual Fund    
Financial assets:    
Trading equity securities: $ 0.0 $ 0.0