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Note 18 - Pension and Postretirement Benefits - Summary of Estimated Future Benefit Payments for Respective Plans (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Pension Plan and SERP Plan [Member]  
2022, gross benefit amount $ 30.5
2023, gross benefit amount 30.3
2024, gross benefit amount 30.0
2025, gross benefit amount 29.0
2026, gross benefit amount 28.5
2027 and thereafter, gross benefit amount 132.5
Other Postretirement Benefits Plan [Member]  
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 (0.1)
2024, Net benefit amount 0.7
2025, gross benefit amount 0.7
2025, Medicare subsidy payments (0.1)
2025, Net benefit amount 0.6
2026, gross benefit amount 0.6
2026, Medicare subsidy payments 0.0
2026, Net benefit amount 0.6
2027 and thereafter, gross benefit amount 2.0
2027 and thereafter, Medicare subsidy payments 0.0
2027 and thereafter, Net benefit amount $ 2.0