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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 ($)
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