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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plan, Accumulated Benefit Obligation | $ 757.9 | $ 763.5
Expected defined benefit plan contributions for next fiscal year for qualified plans | 11.0 |
Expected defined benefit plan contributions for next fiscal year for non-qualified plans | 0.4 |
Expected defined benefit plan contributions for next fiscal year for postretirement health and life benefit plans | 11.6 |
Defined Contribution Plan, Cost | 1.6 | 1.7
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | (7.2) | 4.0
Pension plan assets transferred for annuitization | 30.4 |
Pension plan obligations transferred for annuitization | $ 30.4 |
Pension Plan, Defined Benefit [Member] |  |
Approximate Number of Plan Participants | 4,600 |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ 56.7 | $ 59.8
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.50% | 3.30%
Other Postretirement Benefits Plan [Member] |  |
Approximate Number of Plan Participants | 2,600 |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (1.6) | $ 9.1
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.50% | 3.30%

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- Definition Expected defined benefit plan contributions for next fiscal year for non-qualified plans + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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