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EMPLOYEE BENEFITS - CASH FLOWS (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Costs  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to the plans during the next year $ 0.7
2019 34.7
2020 35.5
2021 36.5
2022 37.0
2023 36.3
2024 through 2028 185.7
OPEB Costs  
Defined Benefit Plan Disclosure [Line Items]  
2019 7.8
2020 8.9
2021 9.2
2022 8.7
2023 8.9
2024 through 2028 $ 46.9