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Fair Value Measurements (Details) - Measured at Fair Value on a Recurring Basis - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial Assets [Abstract]    
Total financial assets $ 20.9 $ 18.1
Financial liabilities:    
Derivative financial instruments   0.5
Deferred compensation programs liabilities 7.2 7.3
Total financial liabilities 7.2 7.8
Corporate bonds    
Financial Assets [Abstract]    
Trading debt securities 3.3 4.8
Municipal bonds    
Financial Assets [Abstract]    
Trading debt securities 0.2 0.9
Floating rate notes    
Financial Assets [Abstract]    
Trading debt securities 0.4 0.4
U.S. government securities    
Financial Assets [Abstract]    
Trading debt securities 1.1 1.8
Asset-backed securities    
Financial Assets [Abstract]    
Trading debt securities 3.5 2.1
Other    
Financial Assets [Abstract]    
Trading debt securities 4.1 1.0
Derivative financial instruments    
Financial Assets [Abstract]    
Derivative asset 0.1 0.1
Preferred stocks    
Financial Assets [Abstract]    
Trading equity securities 0.3 0.3
Equity funds    
Financial Assets [Abstract]    
Trading equity securities 3.0 1.7
Supplemental Employee Retirement Plan | Deferred compensation programs money market fund    
Financial Assets [Abstract]    
Trading equity securities   0.2
Supplemental Employee Retirement Plan | Deferred compensation programs mutual funds    
Financial Assets [Abstract]    
Trading equity securities 4.9 4.8
Level 1    
Financial Assets [Abstract]    
Total financial assets 16.1 14.0
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 [Abstract]    
Trading debt securities 3.3 4.8
Level 1 | Municipal bonds    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Level 1 | Floating rate notes    
Financial Assets [Abstract]    
Trading debt securities 0.4 0.4
Level 1 | U.S. government securities    
Financial Assets [Abstract]    
Trading debt securities 1.1 1.8
Level 1 | Asset-backed securities    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Level 1 | Other    
Financial Assets [Abstract]    
Trading debt securities 3.1 0.0
Level 1 | Derivative financial instruments    
Financial Assets [Abstract]    
Derivative asset 0.0 0.0
Level 1 | Preferred stocks    
Financial Assets [Abstract]    
Trading equity securities 0.3 0.3
Level 1 | Equity funds    
Financial Assets [Abstract]    
Trading equity securities 3.0 1.7
Level 1 | Supplemental Employee Retirement Plan | Deferred compensation programs money market fund    
Financial Assets [Abstract]    
Trading equity securities   0.2
Level 1 | Supplemental Employee Retirement Plan | Deferred compensation programs mutual funds    
Financial Assets [Abstract]    
Trading equity securities 4.9 4.8
Level 2    
Financial Assets [Abstract]    
Total financial assets 4.8 4.1
Financial liabilities:    
Derivative financial instruments   0.5
Deferred compensation programs liabilities 7.2 7.3
Total financial liabilities 7.2 7.8
Level 2 | Corporate bonds    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Level 2 | Municipal bonds    
Financial Assets [Abstract]    
Trading debt securities 0.2 0.9
Level 2 | Floating rate notes    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Level 2 | U.S. government securities    
Financial Assets [Abstract]    
Trading debt securities 0.0 0.0
Level 2 | Asset-backed securities    
Financial Assets [Abstract]    
Trading debt securities 3.5 2.1
Level 2 | Other    
Financial Assets [Abstract]    
Trading debt securities 1.0 1.0
Level 2 | Derivative financial instruments    
Financial Assets [Abstract]    
Derivative asset 0.1 0.1
Level 2 | Preferred stocks    
Financial Assets [Abstract]    
Trading equity securities 0.0 0.0
Level 2 | Equity funds    
Financial Assets [Abstract]    
Trading equity securities 0.0 0.0
Level 2 | Supplemental Employee Retirement Plan | Deferred compensation programs money market fund    
Financial Assets [Abstract]    
Trading equity securities   0.0
Level 2 | Supplemental Employee Retirement Plan | Deferred compensation programs mutual funds    
Financial Assets [Abstract]    
Trading equity securities $ 0.0 $ 0.0