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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
Jun. 30, 2022
Dec. 31, 2021
Financial assets:    
Derivative financial instruments $ 0.3 $ 0.1
Total financial assets 20.6 20.9
Financial liabilities:    
Deferred compensation programs' liabilities 5.6 7.2
Total financial liabilities 5.6 7.2
Corporate bonds    
Financial assets:    
Trading debt securities: 6.4 3.3
Municipal bonds    
Financial assets:    
Trading debt securities: 0.1 0.2
Floating rate notes    
Financial assets:    
Trading debt securities: 0.4 0.4
U.S. government securities    
Financial assets:    
Trading debt securities: 0.9 1.1
Asset-backed securities    
Financial assets:    
Trading debt securities: 4.4 3.5
Other    
Financial assets:    
Trading debt securities: 2.8 4.1
Preferred stocks    
Financial assets:    
Trading equity securities: 0.3 0.3
Equity Funds    
Financial assets:    
Trading equity securities: 0.6 3.0
Supplemental Employee Retirement Plan | Mutual Fund    
Financial assets:    
Trading equity securities: 4.4 4.9
Level 1    
Financial assets:    
Derivative financial instruments 0.0 0.0
Total financial assets 15.1 16.1
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: 6.4 3.3
Level 1 | Municipal bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Floating rate notes    
Financial assets:    
Trading debt securities: 0.4 0.4
Level 1 | U.S. government securities    
Financial assets:    
Trading debt securities: 0.9 1.1
Level 1 | Asset-backed securities    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 1 | Other    
Financial assets:    
Trading debt securities: 2.1 3.1
Level 1 | Preferred stocks    
Financial assets:    
Trading equity securities: 0.3 0.3
Level 1 | Equity Funds    
Financial assets:    
Trading equity securities: 0.6 3.0
Level 1 | Supplemental Employee Retirement Plan | Mutual Fund    
Financial assets:    
Trading equity securities: 4.4 4.9
Level 2    
Financial assets:    
Derivative financial instruments 0.3 0.1
Total financial assets 5.5 4.8
Financial liabilities:    
Deferred compensation programs' liabilities 5.6 7.2
Total financial liabilities 5.6 7.2
Level 2 | Corporate bonds    
Financial assets:    
Trading debt securities: 0.0 0.0
Level 2 | Municipal bonds    
Financial assets:    
Trading debt securities: 0.1 0.2
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: 4.4 3.5
Level 2 | Other    
Financial assets:    
Trading debt securities: 0.7 1.0
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