Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financial liabilities:
Derivative financial instruments	$ 0.0	$ 0.1
Measured at Fair Value on a Recurring Basis
Financial Assets [Abstract]
Total financial assets	21.9	19.5
Financial liabilities:
Derivative financial instruments		0.1
Deferred compensation programs' liabilities	6.1	5.5
Total financial liabilities	6.1	5.6
Measured at Fair Value on a Recurring Basis | Corporate bonds
Financial Assets [Abstract]
Trading debt securities	3.2	3.4
Measured at Fair Value on a Recurring Basis | Agency bonds
Financial Assets [Abstract]
Trading debt securities	1.5	2.5
Measured at Fair Value on a Recurring Basis | U.S. government securities
Financial Assets [Abstract]
Trading debt securities	2.4	1.9
Measured at Fair Value on a Recurring Basis | Asset-backed securities
Financial Assets [Abstract]
Trading debt securities	7.1	4.0
Measured at Fair Value on a Recurring Basis | Exchange traded funds
Financial Assets [Abstract]
Trading debt securities	0.8	1.3
Measured at Fair Value on a Recurring Basis | Mortgage backed securities
Financial Assets [Abstract]
Trading debt securities	0.4	0.5
Measured at Fair Value on a Recurring Basis | Other
Financial Assets [Abstract]
Trading debt securities	0.5	0.7
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	0.7
Measured at Fair Value on a Recurring Basis | Supplemental Employee Retirement Plan | Deferred compensation programs' mutual funds
Financial Assets [Abstract]
Trading equity securities	5.1	4.2
Measured at Fair Value on a Recurring Basis | Level 1
Financial Assets [Abstract]
Total financial assets	12.6	12.0
Financial liabilities:
Derivative financial instruments		0.0
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	3.2	3.4
Measured at Fair Value on a Recurring Basis | Level 1 | Agency bonds
Financial Assets [Abstract]
Trading debt securities	0.0	0.0
Measured at Fair Value on a Recurring Basis | Level 1 | U.S. government securities
Financial Assets [Abstract]
Trading debt securities	2.4	1.9
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 | Exchange traded funds
Financial Assets [Abstract]
Trading debt securities	0.8	1.3
Measured at Fair Value on a Recurring Basis | Level 1 | Mortgage 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	0.2	0.2
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	0.7
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	5.1	4.2
Measured at Fair Value on a Recurring Basis | Level 2
Financial Assets [Abstract]
Total financial assets	9.3	7.5
Financial liabilities:
Derivative financial instruments		0.1
Deferred compensation programs' liabilities	6.1	5.5
Total financial liabilities	6.1	5.6
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 | Agency bonds
Financial Assets [Abstract]
Trading debt securities	1.5	2.5
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	7.1	4.0
Measured at Fair Value on a Recurring Basis | Level 2 | Exchange traded funds
Financial Assets [Abstract]
Trading debt securities	0.0	0.0
Measured at Fair Value on a Recurring Basis | Level 2 | Mortgage backed securities
Financial Assets [Abstract]
Trading debt securities	0.4	0.5
Measured at Fair Value on a Recurring Basis | Level 2 | Other
Financial Assets [Abstract]
Trading debt securities	0.3	0.5
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