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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 381.3 | $ 358.2
Equity Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 206.7 | 200.0
Fixed Income Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 116.5 | 99.7
Real Estate [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 1.0 | 1.0
Other [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 57.1 | $ 57.5

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