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Note 18 - Pension and Postretirement Benefits - Summary of Estimated Future Benefit Payments for Respective Plans (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Pension Plan and SERP Plan [Member] |
2021, gross benefit amount | $ 30.5
2022, gross benefit amount | 30.1
2023, gross benefit amount | 30.3
2024, gross benefit amount | 29.9
2025, gross benefit amount | 28.9
2026-2030, gross benefit amount | 135.5
Other Postretirement Benefits Plan [Member] |
2021, gross benefit amount | 1.2
2021, Medicare subsidy payments | (0.2)
2021, Net benefit amount | 1.0
2022, gross benefit amount | 1.1
2022, Medicare subsidy payments | (0.2)
2022, Net benefit amount | 0.9
2023, gross benefit amount | 1.0
2023, Medicare subsidy payments | (0.2)
2023, Net benefit amount | 0.8
2024, gross benefit amount | 0.8
2024, Medicare subsidy payments | 0.0
2024, Net benefit amount | 0.8
2025, gross benefit amount | 0.7
2025, Medicare subsidy payments | 0.0
2025, Net benefit amount | 0.7
2026-2030, gross benefit amount | 2.4
2026-2030, Medicare subsidy payments | (0.1)
2026-2030, Net benefit amount | $ 2.3

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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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