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PENSION AND POST-RETIREMENT PLANS - ESTIMATED BENEFIT PAYMENTS (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Benefits  
Estimated future benefit payments  
2019 $ 13.2
2020 13.5
2021 13.8
2022 14.1
2023 14.5
2024-2028 75.0
Total future payments 144.1
Post-retirement Benefits  
Estimated future benefit payments  
2019 1.2
2020 1.1
2021 1.2
2022 1.2
2023 1.2
2024-2028 5.8
Total future payments 11.7
Nonqualified Plan | Pension Benefits  
Estimated future benefit payments  
2019 1.8
2020 0.4
2022 0.3
2023 1.8
2024-2028 0.1
Total future payments $ 4.4