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PENSION AND POST-RETIREMENT PLANS - ESTIMATED BENEFIT PAYMENTS (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Estimated future benefit payments  
2021 $ 14.0
2022 14.4
2023 14.6
2024 14.7
2025 14.9
2026-2030 76.2
Total remaining future undiscounted payments due 148.8
Post-retirement Benefits  
Estimated future benefit payments  
2021 1.0
2022 1.0
2023 1.0
2024 1.1
2025 1.1
2026-2030 5.5
Total remaining future undiscounted payments due 10.7
Nonqualified Plan | Pension Benefits  
Estimated future benefit payments  
2021 1.7
2023 2.2
2026-2030 0.6
Total remaining future undiscounted payments due $ 4.5