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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financial Assets [Abstract]    
Derivative asset $ 0.0 $ 0.1
Measured at Fair Value on a Recurring Basis    
Financial Assets [Abstract]    
Total financial assets 19.0 20.9
Financial liabilities:    
Deferred compensation programs' liabilities 5.7 7.2
Total financial liabilities 5.7 7.2
Measured at Fair Value on a Recurring Basis | Corporate bonds    
Financial Assets [Abstract]    
Trading debt securities 5.0 3.3
Measured at Fair Value on a Recurring Basis | Municipal bonds    
Financial Assets [Abstract]    
Trading debt securities 0.3 0.2
Measured at Fair Value on a Recurring Basis | Floating rate notes    
Financial Assets [Abstract]    
Trading debt securities 0.2 0.4
Measured at Fair Value on a Recurring Basis | U.S. government securities    
Financial Assets [Abstract]    
Trading debt securities 0.8 1.1
Measured at Fair Value on a Recurring Basis | Asset-backed securities    
Financial Assets [Abstract]    
Trading debt securities 5.4 3.5
Measured at Fair Value on a Recurring Basis | Other    
Financial Assets [Abstract]    
Trading debt securities 2.0 4.1
Measured at Fair Value on a Recurring Basis | Derivative financial instruments    
Financial Assets [Abstract]    
Derivative asset   0.1
Measured at Fair Value on a Recurring Basis | Preferred stocks    
Financial Assets [Abstract]    
Trading equity securities 0.3 0.3
Measured at Fair Value on a Recurring Basis | Equity funds    
Financial Assets [Abstract]    
Trading equity securities 0.6 3.0
Measured at Fair Value on a Recurring Basis | Supplemental Employee Retirement Plan | Deferred compensation programs' mutual funds    
Financial Assets [Abstract]    
Trading equity securities 4.4 4.9
Measured at Fair Value on a Recurring Basis | Level 1    
Financial Assets [Abstract]    
Total financial assets 12.6 16.1
Financial liabilities:    
Deferred compensation programs' liabilities 0.0 0.0
Total financial liabilities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 1 | Corporate bonds    
Financial Assets [Abstract]    
Trading debt securities 5.0 3.3
Measured at Fair Value on a Recurring Basis | Level 1 | Municipal bonds    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 1 | Floating rate notes    
Financial Assets [Abstract]    
Trading debt securities 0.2 0.4
Measured at Fair Value on a Recurring Basis | Level 1 | U.S. government securities    
Financial Assets [Abstract]    
Trading debt securities 0.8 1.1
Measured at Fair Value on a Recurring Basis | Level 1 | Asset-backed securities    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 1 | Other    
Financial Assets [Abstract]    
Trading debt securities 1.3 3.1
Measured at Fair Value on a Recurring Basis | Level 1 | Derivative financial instruments    
Financial Assets [Abstract]    
Derivative asset   0.0
Measured at Fair Value on a Recurring Basis | Level 1 | Preferred stocks    
Financial Assets [Abstract]    
Trading equity securities 0.3 0.3
Measured at Fair Value on a Recurring Basis | Level 1 | Equity funds    
Financial Assets [Abstract]    
Trading equity securities 0.6 3.0
Measured at Fair Value on a Recurring Basis | Level 1 | Supplemental Employee Retirement Plan | Deferred compensation programs' mutual funds    
Financial Assets [Abstract]    
Trading equity securities 4.4 4.9
Measured at Fair Value on a Recurring Basis | Level 2    
Financial Assets [Abstract]    
Total financial assets 6.4 4.8
Financial liabilities:    
Deferred compensation programs' liabilities 5.7 7.2
Total financial liabilities 5.7 7.2
Measured at Fair Value on a Recurring Basis | Level 2 | Corporate bonds    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 2 | Municipal bonds    
Financial Assets [Abstract]    
Trading debt securities 0.3 0.2
Measured at Fair Value on a Recurring Basis | Level 2 | Floating rate notes    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 2 | U.S. government securities    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 2 | Asset-backed securities    
Financial Assets [Abstract]    
Trading debt securities 5.4 3.5
Measured at Fair Value on a Recurring Basis | Level 2 | Other    
Financial Assets [Abstract]    
Trading debt securities 0.7 1.0
Measured at Fair Value on a Recurring Basis | Level 2 | Derivative financial instruments    
Financial Assets [Abstract]    
Derivative asset   0.1
Measured at Fair Value on a Recurring Basis | Level 2 | Preferred stocks    
Financial Assets [Abstract]    
Trading equity securities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 2 | Equity funds    
Financial Assets [Abstract]    
Trading equity securities 0.0 0.0
Measured at Fair Value on a Recurring Basis | Level 2 | Supplemental Employee Retirement Plan | Deferred compensation programs' mutual funds    
Financial Assets [Abstract]    
Trading equity securities $ 0.0 $ 0.0