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Fair Value Measurements (Details) - Fair Value, Recurring - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Financial assets:
Total financial assets	$ 24.5	$ 23.2
Financial liabilities:
Deferred compensation programs' liabilities	7.3	6.7
Total financial liabilities	7.3	6.7
Corporate bonds
Financial assets:
Trading debt securities:	3.5	3.6
Agency bonds
Financial assets:
Trading debt securities:	0.9	0.9
U.S. government securities
Financial assets:
Trading debt securities:	3.7	2.4
Agency collateralized mortgage obligations
Financial assets:
Trading debt securities:	8.4	8.5
Exchange traded funds
Financial assets:
Trading debt securities:	0.4	0.4
Mortgage backed securities
Financial assets:
Trading debt securities:	0.3	0.3
Other
Financial assets:
Trading debt securities:	0.2	0.3
Preferred stocks
Financial assets:
Trading equity securities:	0.3	0.3
Equity Funds
Financial assets:
Trading equity securities:	0.6	0.6
Supplemental Employee Retirement Plan and Non-Qualified Deferred Compensation Plan | Mutual Fund
Financial assets:
Trading equity securities:	6.2	5.9
Level 1
Financial assets:
Total financial assets	14.7	13.2
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:	3.5	3.6
Level 1 | Agency bonds
Financial assets:
Trading debt securities:	0.0	0.0
Level 1 | U.S. government securities
Financial assets:
Trading debt securities:	3.7	2.4
Level 1 | Agency collateralized mortgage obligations
Financial assets:
Trading debt securities:	0.0	0.0
Level 1 | Exchange traded funds
Financial assets:
Trading debt securities:	0.4	0.4
Level 1 | Mortgage backed securities
Financial assets:
Trading debt securities:	0.0	0.0
Level 1 | Other
Financial assets:
Trading debt securities:	0.0	0.0
Level 1 | Preferred stocks
Financial assets:
Trading equity securities:	0.3	0.3
Level 1 | Equity Funds
Financial assets:
Trading equity securities:	0.6	0.6
Level 1 | Supplemental Employee Retirement Plan and Non-Qualified Deferred Compensation Plan | Mutual Fund
Financial assets:
Trading equity securities:	6.2	5.9
Level 2
Financial assets:
Total financial assets	9.8	10.0
Financial liabilities:
Deferred compensation programs' liabilities	7.3	6.7
Total financial liabilities	7.3	6.7
Level 2 | Corporate bonds
Financial assets:
Trading debt securities:	0.0	0.0
Level 2 | Agency bonds
Financial assets:
Trading debt securities:	0.9	0.9
Level 2 | U.S. government securities
Financial assets:
Trading debt securities:	0.0	0.0
Level 2 | Agency collateralized mortgage obligations
Financial assets:
Trading debt securities:	8.4	8.5
Level 2 | Exchange traded funds
Financial assets:
Trading debt securities:	0.0	0.0
Level 2 | Mortgage backed securities
Financial assets:
Trading debt securities:	0.3	0.3
Level 2 | Other
Financial assets:
Trading debt securities:	0.2	0.3
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 and Non-Qualified Deferred Compensation Plan | Mutual Fund
Financial assets:
Trading equity securities:	$ 0.0	$ 0.0

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