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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | May 28, 2024 USD ($) | Oct. 12, 2023 USD ($)
Defined Contribution Plan, Cost |  |  |  | $ 2.6 | $ 2.3 | $ 2.1 |  |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement |  |  |  | $ 17.3 | 24.6 | (7.8) |  |
Portion of Defined Benefit Plan, Benefit Obligation related to Remeasurement |  |  |  |  |  | 30.6 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  | $ 16.8 | $ 0.9 |  |  |  |  |
Defined Benefit Plan, Pension Plan Obligation Transferred |  |  |  |  |  |  | $ 234.0 | $ 186.5
Defined Benefit Plan, Pension Plan Assets Transferred |  | $ 15.4 |  |  |  |  | $ 224.0 | $ 171.4
Income (Loss) Related to Pension Settlement | $ 28.6 |  |  |  |  |  |  |
Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |
Approximate Number of Plan Participants |  |  |  | 300 |  |  |  |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement |  |  |  | $ (21.9) | (25.2) |  |  |
Defined Benefit Plan, Benefit Obligation | 308.2 |  |  | 30.6 | 308.2 | 527.3 |  |
Pension Plan, Defined Benefit [Member] | Qualified Plan [Member] |  |  |  |  |  |  |  |
Expected defined benefit plan contributions for next fiscal year for qualified plans |  |  |  | 0.0 |  |  |  |
Pension Plan, Defined Benefit [Member] | Nonqualified Plan [Member] |  |  |  |  |  |  |  |
Expected defined benefit plan contributions for next fiscal year for qualified plans |  |  |  | 0.4 |  |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |  |
Expected defined benefit plan contributions for next fiscal year for qualified plans |  |  |  | 9.6 |  |  |  |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement |  |  |  | 0.0 | 1.4 |  |  |
Defined Benefit Plan, Benefit Obligation | $ 91.3 |  |  | $ 84.1 | $ 91.3 | $ 95.3 |  |

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