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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($)
Gain (loss) related to litigation settlement |  | $ 43.5 | $ 32.6 |  |  |  |
Defined Contribution Plan, Cost | $ 2.1 | 2.0 |  |  |  |  |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (7.8) | 50.5 | (7.2) |  |  |  |
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 | 3,500 |  |  |  |  |  |
Gain (loss) related to litigation settlement |  | 33.8 |  |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment |  |  |  | $ (1.3) |  |  |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (138.0) | (28.7) |  |  |  |  |
Pension Plan, Defined Benefit [Member] | Qualified Plan [Member] |  |  |  |  |  |  |
Expected defined benefit plan contributions for next fiscal year for qualified plans | 0.0 |  |  |  |  |  |
Pension Plan, Defined Benefit [Member] | Nonqualified Plan [Member] |  |  |  |  |  |  |
Expected defined benefit plan contributions for next fiscal year for qualified plans | $ 0.4 |  |  |  |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |
Approximate Number of Plan Participants | 2,900 |  |  |  |  |  |
Gain (loss) related to litigation settlement |  | 9.7 |  |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment |  |  |  |  | $ (10.0) | $ (3.6) | $ (6.8)
Expected defined benefit plan contributions for next fiscal year for qualified plans | $ 7.3 |  |  |  |  |  |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (27.0) | $ (2.3) |  |  |  |  |

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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