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PENSION AND POST-RETIREMENT PLANS - ESTIMATED BENEFIT PAYMENTS (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Pension Benefits  
Estimated future benefit payments  
2022 $ 14.5
2023 14.7
2024 14.8
2025 15.0
2026 15.3
2027-2031 76.9
Total remaining future undiscounted payments due 151.2
Post-retirement benefits  
Estimated future benefit payments  
2022 0.9
2023 1.1
2024 1.0
2025 1.1
2026 1.1
2027-2031 5.8
Total remaining future undiscounted payments due 11.0
Nonqualified Plan | Pension Benefits  
Estimated future benefit payments  
2022 1.8
2023 2.2
2025 0.1
2026 0.1
2027-2031 1.3
Total remaining future undiscounted payments due $ 5.5