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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | May 28, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | $ (16.6) | $ 0.0 | $ (16.6) | $ 0.0 |
Pension Plan, Defined Benefit [Member] |  |  |  |  |
Defined Benefit Plan, Pension Plan Obligation Transferred |  |  |  |  | $ 234.0
Defined Benefit Plan, Plan Assets, Amount |  |  |  |  | $ 224.0

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