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PENSION AND POST-RETIREMENT BENEFITS - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 47.7
2021 42.4
2022 42.2
2023 41.5
2024 40.6
Years 2025 to 2029 189.9
Other Post-Retirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 1.4
2021 1.3
2022 1.3
2023 1.2
2024 1.2
Years 2025 to 2029 $ 4.7