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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | $ 317.4 | $ 285.4
Equity Securities [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | 162.9 | 155.0
Fixed Income Securities [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | 112.0 | 91.9
Real Estate [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | 0.8 | 0.8
Other [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | $ 41.7 | $ 37.7

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