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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | May 28, 2024 | Oct. 12, 2023 | Dec. 31, 2022
Defined Benefit Plan, Benefit Obligation |  |  |  |  |  |  |  | $ 527.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | $ (0.2) | $ (0.9) | $ (16.8) | $ (0.9) |  |  |  |
Portion of Defined Benefit Plan, Benefit Obligation related to Annuity |  | $ 30.6 |  | $ 30.6 |  |  |  |
Income (Loss) Related To Pension Settlement |  |  |  |  | $ 28.6 |  |  |
Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Pension Plan Obligation Transferred |  |  |  |  |  | $ 234.0 | $ 186.5 |
Defined Benefit Plan, Plan Assets, Amount | $ 15.4 |  | $ 15.4 |  |  | $ 224.0 | $ 171.4 |

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