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Pension and Postretirement Health and Life Benefits (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ 24.6 | $ (7.8) | $ 50.5
Defined Benefit Plan, Plan Assets, Amount | 291.0 | 486.8 |
Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 308.2 | 527.3 | 696.2
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | (25.2) | (138.0) |
Defined Benefit Plan, Service Cost | 2.9 | 2.7 | 2.7
Defined Benefit Plan, Interest Cost | 27.8 | 19.1 | 18.1
Defined Benefit Plan, Benefit Obligation, Increase for Plan Amendment | (0.4) | 0.0 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | (171.4) | 0.0 |
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid | (3.0) | (2.3) |
Defined Benefit Plan, Plan Assets, Amount | 290.5 | 483.3 | 672.7
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 31.8 | (137.1) |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 0.4 | 0.4 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 50.6 | 50.4 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (171.4) | 0.0 |
Defined Benefit Plan, Plan Assets, Administration Expense | (3.0) | (2.3) |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (17.7) | (44.0) |
Amounts Recognized In Current Liabilities | (0.4) | (0.4) |
Amounts Recognized In Noncurrent Liabilities | (17.3) | (43.6) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (17.7) | (44.0) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | (0.1) | (0.7) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (0.1) | (0.7) | (0.9)
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 91.3 | 95.3 | 131.1
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | 1.4 | (27.0) |
Defined Benefit Plan, Service Cost | 0.0 | 0.0 | 0.0
Defined Benefit Plan, Interest Cost | 5.0 | 3.5 | 3.4
Defined Benefit Plan, Benefit Obligation, Increase for Plan Amendment | 0.0 | 0.0 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 0.0 | 0.0 |
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid | 0.0 | 0.0 |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 3.5 | 9.2
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 0.1 | (0.1) |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 6.8 | 6.7 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 10.4 | 12.3 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0.0 | 0.0 |
Defined Benefit Plan, Plan Assets, Administration Expense | 0.0 | 0.0 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (91.3) | (91.8) |
Amounts Recognized In Current Liabilities | (10.1) | (7.3) |
Amounts Recognized In Noncurrent Liabilities | (81.2) | (84.5) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (91.3) | (91.8) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | (1.8) | (1.9) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (1.8) | (1.9) | $ (2.0)
Plan paid [Member] | Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (50.2) | (50.0) |
Plan paid [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (10.4) | (12.3) |
Company paid [Member] | Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (0.4) | (0.4) |
Company paid [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | $ 0.0 | $ 0.0 |

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