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EMPLOYEE BENEFITS - CASH FLOWS (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year $ 0.7
2020 35.6
2021 36.3
2022 36.5
2023 37.4
2024 37.5
2025 through 2029 190.3
OPEB Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year 0.1
2020 8.9
2021 8.0
2022 8.3
2023 8.6
2024 8.7
2025 through 2029 $ 46.0