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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (7.8) | $ 50.5 | $ (7.2)
Defined Benefit Plan, Plan Assets, Amount | 486.8 | 681.8 |
Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 527.3 | 696.2 | 757.9
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | (138.0) | (28.7) |
Defined Benefit Plan, Service Cost | 2.7 | 2.7 | 3.5
Defined Benefit Plan, Interest Cost | 19.1 | 18.1 | 24.3
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid | (2.3) | (2.1) |
Defined Benefit Plan, Plan Assets, Amount | 483.3 | 672.7 | 633.1
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (137.1) | 57.8 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 0.4 | 35.7 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 50.4 | 51.7 |
Defined Benefit Plan, Plan Assets, Administration Expense | (2.3) | (2.2) |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (44.0) | (23.5) |
Amounts Recognized In Current Liabilities | (0.4) | (0.4) |
Amounts Recognized In Noncurrent Liabilities | (43.6) | (23.1) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (44.0) | (23.5) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | (0.7) | (0.9) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (0.7) | (0.9) | (1.1)
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 95.3 | 131.1 | 142.4
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | (27.0) | (2.3) |
Defined Benefit Plan, Service Cost | 0.0 | 0.0 | 0.0
Defined Benefit Plan, Interest Cost | 3.5 | 3.4 | 4.8
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid | 0.0 | 0.0 |
Defined Benefit Plan, Plan Assets, Amount | 3.5 | 9.2 | 0.0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (0.1) | 0.0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 6.7 | 21.5 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 12.3 | 12.3 |
Defined Benefit Plan, Plan Assets, Administration Expense | 0.0 | 0.0 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (91.8) | (121.9) |
Amounts Recognized In Current Liabilities | (7.3) | (7.0) |
Amounts Recognized In Noncurrent Liabilities | (84.5) | (114.9) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (91.8) | (121.9) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | (1.9) | (2.0) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (1.9) | (2.0) | $ (2.1)
Plan paid [Member] | Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (50.0) | (51.3) |
Plan paid [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (12.3) | (12.4) |
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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