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Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Pension Plan, Defined Benefit [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 50.5 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 48.8 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 47.3 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 47.1 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 44.8 |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | $ 206.2 |
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months |  | $ 10.9
Defined Benefit Plan, Expected Future Benefit Payment, Year Two |  | 10.2
Defined Benefit Plan, Expected Future Benefit Payment, Year Three |  | 9.6
Defined Benefit Plan, Expected Future Benefit Payment, Year Four |  | 9.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Five |  | 8.5
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter |  | $ 34.1

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- Definition Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year. + 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 (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year. + 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 (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year. + 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 (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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