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v3.23.3

Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Oct. 12, 2023 | Dec. 31, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | $ (0.9) | $ 0.0 | $ (0.9) | $ 0.0 |  |
Pension Plan, Defined Benefit [Member] |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  |  | $ 527.3
Portion of Defined Benefit Plan, Benefit Obligation related to Annuity |  |  |  |  |  | $ 30.6
Pension Plan, Defined Benefit [Member] | Subsequent Event |  |  |  |  |  |
Defined Benefit Plan, Pension Plan Obligation Transferred |  |  |  |  | $ 186.5 |
Estimated Litigation Liability |  |  |  |  | 15.1 |
Defined Benefit Plan, Plan Assets, Amount |  |  |  |  | $ 171.4 |

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