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Pension and Postretirement Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Pension benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 2.4 | $ 3.3
Interest cost | 7.2 | 4.0
Expected return on plan assets | (7.2) | (4.6)
Amortization of net actuarial losses | 2.0 | 2.2
Amortization of prior service cost | 0.3 | 0.1
Net periodic cost | 4.7 | 5.0
Postretirement benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 0.0 | 0.1
Interest cost | 0.3 | 0.2
Amortization of prior service cost | 0.1 | 0.1
Net periodic cost | $ 0.4 | $ 0.4

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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)(5) -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)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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