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Note 18 - Pension and Postretirement Benefits - Summary of Estimated Future Benefit Payments for Respective Plans (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Pension Plan and SERP Plan [Member] |
2024, gross benefit amount | $ 29.4
2025, gross benefit amount | 28.9
2026, gross benefit amount | 28.4
2027, gross benefit amount | 28.4
2028, gross benefit amount | 27.0
2029 and thereafter, gross benefit amount | 123.3
Other Postretirement Benefits Plan [Member] |
2024, gross benefit amount | 0.8
2024, Medicare subsidy payments | (0.1)
2024, Net benefit amount | 0.7
2025, gross benefit amount | 0.7
2025, Medicare subsidy payments | 0.0
2025, Net benefit amount | 0.7
2026, gross benefit amount | 0.6
2026, Medicare subsidy payments | 0.0
2026, Net benefit amount | 0.6
2027, gross benefit amount | 0.5
2027, Medicare subsidy payments | 0.0
2027, Net benefit amount | 0.5
2028, gross benefit amount | 0.4
2028, Medicare subsidy payments | 0.0
2028, Net benefit amount | 0.4
2029 and thereafter, gross benefit amount | 1.4
2029 and thereafter, Medicare subsidy payments | 0.0
2029 and thereafter, Net benefit amount | $ 1.4

X
- 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 -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 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 fifth 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 third 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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