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PENSION AND POST-RETIREMENT PLANS - ESTIMATED BENEFIT PAYMENTS (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Estimated future benefit payments  
2024 $ 14.7
2025 15.0
2026 15.2
2027 15.4
2028 15.6
2029-2033 77.0
Total remaining future undiscounted payments due 152.9
Post-retirement benefits  
Estimated future benefit payments  
2024 1.1
2025 1.1
2026 1.2
2027 1.2
2028 1.2
2029-2033 6.1
Total remaining future undiscounted payments due 11.9
Nonqualified Plan | Pension Benefits  
Estimated future benefit payments  
2024 1.2
2025 0.4
2026 0.5
2027 0.5
2028 0.4
2029-2033 2.6
Total remaining future undiscounted payments due $ 5.6