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Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Pension Plan, Defined Benefit [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 30.0 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 28.5 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 28.6 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 26.9 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 26.1 |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | $ 120.1 |
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months |  | $ 10.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Two |  | 9.5
Defined Benefit Plan, Expected Future Benefit Payment, Year Three |  | 9.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Four |  | 8.4
Defined Benefit Plan, Expected Future Benefit Payment, Year Five |  | 7.8
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter |  | $ 31.6

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- Definition Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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