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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 358.2 | $ 340.0
Equity Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 200.0 | 187.5
Fixed Income Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 99.7 | 98.8
Real Estate [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 1.0 | 0.9
Other [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 57.5 | $ 52.8

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