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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
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ 17.3 | $ 24.6 | $ (7.8)
Defined Benefit Plan, Plan Assets, Amount | 31.0 | 291.0 |
Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 30.6 | 308.2 | 527.3
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | (21.9) | (25.2) |
Defined Benefit Plan, Service Cost | 2.1 | 2.9 | 2.7
Defined Benefit Plan, Interest Cost | 7.6 | 27.8 | 19.1
Defined Benefit Plan, Benefit Obligation, Increase for Plan Amendment | 0.0 | (0.4) |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | (238.8) | (171.4) |
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid | (1.6) | (3.0) |
Defined Benefit Plan, Plan Assets, Amount | 31.0 | 290.5 | 483.3
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 5.3 | 31.8 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 0.6 | 0.4 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 25.0 | 50.6 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (238.8) | (171.4) |
Defined Benefit Plan, Plan Assets, Administration Expense | (1.6) | (3.0) |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 0.4 | (17.7) |
Amounts Recognized In Current Liabilities | (0.4) | (0.4) |
Amounts Recognized In Noncurrent Liabilities | (4.0) | (17.3) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 0.4 | (17.7) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | 0.0 | (0.1) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | 0.0 | (0.1) | (0.7)
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 84.1 | 91.3 | 95.3
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | 0.0 | 1.4 |
Defined Benefit Plan, Service Cost | 0.0 | 0.0 | 0.0
Defined Benefit Plan, Interest Cost | 4.5 | 5.0 | 3.5
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 | 0.0 | 3.5
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 0.0 | 0.1 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 11.7 | 6.8 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 11.7 | 10.4 |
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 | (84.1) | (91.3) |
Amounts Recognized In Current Liabilities | (9.5) | (10.1) |
Amounts Recognized In Noncurrent Liabilities | (74.6) | (81.2) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (84.1) | (91.3) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | (1.7) | (1.8) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (1.7) | (1.8) | $ (1.9)
Plan paid [Member] | Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (24.6) | (50.2) |
Plan paid [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (11.7) | (10.4) |
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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