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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | $ 285.4 | $ 381.4
Equity Securities [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | 155.0 | 206.8
Fixed Income Securities [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | 91.9 | 116.5
Real Estate [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | 0.8 | 1.0
Other [Member] |  |
Fair Value of Plan Assets [Abstract] |  |
Fair value of plan assets | $ 37.7 | $ 57.1

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