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PENSION AND POST-RETIREMENT BENEFITS - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 46.9
2019 43.6
2020 45.3
2021 42.7
2022 43.0
Years 2023 to 2027 202.6
Other Post-Retirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 1.2
2019 1.2
2020 1.2
2021 1.2
2022 1.2
Years 2023 to 2027 $ 5.1