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Note 18 - Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plan and SERP Plan [Member] |  |  |
Interest cost | $ 17.1 | $ 14.7 | $ 11.0
Expected return on plan assets | (24.1) | (28.2) | (32.8)
Amortization of prior service cost (credit) reclassified from accumulated other comprehensive income | 0.2 | 0.2 | 0.2
Amortization of net actuarial loss reclassified from accumulated other comprehensive income | 5.2 | 4.0 | 3.8
Net periodic (credit) benefit cost | (1.6) | (9.3) | (17.8)
Less: Amortization of prior service (cost) credit reclassified from accumulated other comprehensive income | (0.2) | (0.2) | (0.2)
Less: Amortization of actuarial loss reclassified from accumulated other comprehensive losses | (0.1) | (0.2) | (0.2)
Less: Net loss recognized reclassified from accumulated other comprehensive losses | (5.1) | (3.8) | (3.6)
Actuarial (gain) loss | (24.3) | 53.5 | (31.1)
Total recognized in other comprehensive income | (29.7) | 49.3 | (35.1)
Total recognized in net periodic benefit credit and other comprehensive (income) loss | (31.3) | 40.0 | (52.9)
Other Postretirement Benefits Plan [Member] |  |  |
Interest cost | 0.2 | 0.1 | 0.1
Expected return on plan assets | (0.1) | (0.2) | (0.2)
Amortization of prior service cost (credit) reclassified from accumulated other comprehensive income | 0.0 | 0.0 | (0.1)
Amortization of net actuarial loss reclassified from accumulated other comprehensive income | 0.4 | 0.2 | 0.2
Net periodic (credit) benefit cost | 0.5 | 0.1 | 0.0
Less: Amortization of prior service (cost) credit reclassified from accumulated other comprehensive income | 0.0 | 0.0 | 0.1
Less: Amortization of actuarial loss reclassified from accumulated other comprehensive losses | 0.0 | 0.0 | 0.0
Less: Net loss recognized reclassified from accumulated other comprehensive losses | (0.4) | (0.2) | (0.2)
Actuarial (gain) loss | 0.8 | 1.0 | (0.5)
Total recognized in other comprehensive income | 0.4 | 0.8 | (0.6)
Total recognized in net periodic benefit credit and other comprehensive (income) loss | $ 0.9 | $ 0.9 | $ (0.6)

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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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