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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 ($)
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