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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | $ (0.2) | $ (0.9) | $ (16.8) | $ (0.9)
Pension Plan, Defined Benefit [Member] |  |  |  |
Service costs | 0.5 | 0.7 | 1.5 | 2.2
Interest costs | 0.2 | 6.9 | 7.8 | 20.8
Amortization of prior service costs (credits), net | 0.1 | 0.0 | 0.0 | (0.1)
Expected return on plan assets (gains) | (0.2) | (7.7) | (9.5) | (23.2)
Net periodic benefit cost (credit) | 0.4 | (1.0) | (17.0) | (1.2)
Postretirement Health and Life Benefits Plans [Member] |  |  |  |
Interest costs | 1.2 | 1.2 | 3.4 | 3.7
Amortization of prior service costs (credits), net | (0.1) | (0.1) | (0.1) | (0.1)
Net periodic benefit cost (credit) | $ 1.1 | $ 1.1 | $ 3.3 | $ 3.6

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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