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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (7.2) | $ 4.0 |
Defined Benefit Plan, Plan Assets, Amount | 633.0 | 621.2 |
Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | 757.9 | 763.5 | $ 733.8
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | 56.7 | 59.8 |
Defined Benefit Plan, Service Cost | 3.5 | 3.3 |
Defined Benefit Plan, Interest Cost | 24.3 | 30.3 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (56.8) | (59.1) |
Defined Benefit Plan, Benefit Obligation, Increase for Plan Amendment | 0.0 | (1.3) |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | (30.4) | 0.0 |
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid | (2.9) | (3.3) |
Defined Benefit Plan, Plan Assets, Amount | 633.1 | 621.2 | 563.5
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 85.4 | 109.3 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 16.6 | 10.8 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (124.8) | (142.3) |
Amounts Recognized In Current Liabilities | (0.4) | (0.5) |
Amounts Recognized In Noncurrent Liabilities | (124.4) | (141.8) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (124.8) | (142.3) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | (1.1) | (1.3) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | $ (1.1) | $ (1.3) |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.50% | 3.30% |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 142.4 | $ 152.8 | 151.6
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | (1.6) | 9.1 |
Defined Benefit Plan, Service Cost | 0.0 | 0.0 |
Defined Benefit Plan, Interest Cost | 4.8 | 6.0 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (13.6) | (13.9) |
Defined Benefit Plan, Benefit Obligation, Increase for Plan Amendment | 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 | $ 0.0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 0.0 | 0.0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 13.6 | 13.9 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (142.4) | (152.8) |
Amounts Recognized In Current Liabilities | (11.6) | (14.2) |
Amounts Recognized In Noncurrent Liabilities | (130.8) | (138.6) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (142.4) | (152.8) |
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit | (2.1) | (2.3) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | $ (2.1) | $ 0.1 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.50% | 3.30% |
Plan paid [Member] | Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | $ (56.3) | $ (59.1) |
Plan paid [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (13.6) | (13.9) |
Company paid [Member] | Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | $ (0.5) | $ 0.0 |

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