Fair Value Measurements (Details) - Measured at Fair Value on a Recurring Basis - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Financial Assets [Abstract]
Total financial assets	$ 23.2	$ 21.9
Financial liabilities:
Deferred compensation programs' liabilities	6.7	6.1
Total financial liabilities	6.7	6.1
Corporate bonds
Financial Assets [Abstract]
Trading debt securities	3.6	3.2
Agency bonds
Financial Assets [Abstract]
Trading debt securities	0.9	1.5
U.S. government securities
Financial Assets [Abstract]
Trading debt securities	2.4	2.4
Asset-backed securities
Financial Assets [Abstract]
Trading debt securities	8.5	7.1
Exchange traded funds
Financial Assets [Abstract]
Trading debt securities	0.4	0.8
Mortgage backed securities
Financial Assets [Abstract]
Trading debt securities	0.3	0.4
Other
Financial Assets [Abstract]
Trading debt securities	0.3	0.5
Preferred stocks
Financial Assets [Abstract]
Trading equity securities	0.3	0.3
Equity funds
Financial Assets [Abstract]
Trading equity securities	0.6	0.6
Supplemental Employee Retirement Plan | Deferred compensation programs' mutual funds
Financial Assets [Abstract]
Trading equity securities	5.9	5.1
Level 1
Financial Assets [Abstract]
Total financial assets	13.2	12.6
Financial liabilities:
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	3.6	3.2
Level 1 | Agency bonds
Financial Assets [Abstract]
Trading debt securities	0.0	0.0
Level 1 | U.S. government securities
Financial Assets [Abstract]
Trading debt securities	2.4	2.4
Level 1 | Asset-backed securities
Financial Assets [Abstract]
Trading debt securities	0.0	0.0
Level 1 | Exchange traded funds
Financial Assets [Abstract]
Trading debt securities	0.4	0.8
Level 1 | Mortgage backed securities
Financial Assets [Abstract]
Trading debt securities	0.0	0.0
Level 1 | Other
Financial Assets [Abstract]
Trading debt securities	0.0	0.2
Level 1 | Preferred stocks
Financial Assets [Abstract]
Trading equity securities	0.3	0.3
Level 1 | Equity funds
Financial Assets [Abstract]
Trading equity securities	0.6	0.6
Level 1 | Supplemental Employee Retirement Plan | Deferred compensation programs' mutual funds
Financial Assets [Abstract]
Trading equity securities	5.9	5.1
Level 2
Financial Assets [Abstract]
Total financial assets	10.0	9.3
Financial liabilities:
Deferred compensation programs' liabilities	6.7	6.1
Total financial liabilities	6.7	6.1
Level 2 | Corporate bonds
Financial Assets [Abstract]
Trading debt securities	0.0	0.0
Level 2 | Agency bonds
Financial Assets [Abstract]
Trading debt securities	0.9	1.5
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	8.5	7.1
Level 2 | Exchange traded funds
Financial Assets [Abstract]
Trading debt securities	0.0	0.0
Level 2 | Mortgage backed securities
Financial Assets [Abstract]
Trading debt securities	0.3	0.4
Level 2 | Other
Financial Assets [Abstract]
Trading debt securities	0.3	0.3
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' mutual funds
Financial Assets [Abstract]
Trading equity securities	$ 0.0	$ 0.0