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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 340.0 | $ 296.7
Equity Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 187.5 | 162.8
Fixed Income Securities [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 98.8 | 113.6
Real Estate [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | 0.9 | 2.3
Other [Member] |  |
Weighted average asset allocations value [Abstract] |  |
Fair value of plan assets | $ 52.8 | $ 18.0

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