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EMPLOYEE BENEFIT PLANS (Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure  
Estimated future employer contributions in next fiscal year $ 4.0
Pension Benefits  
Defined Benefit Plan, Estimated Future Benefit Payments  
2018 12.2
2019 11.6
2020 11.5
2021 11.4
2022 11.0
Years 2023 through 2027 59.4
Other Benefits  
Defined Benefit Plan, Estimated Future Benefit Payments  
2018 1.1
2019 1.0
2020 1.0
2021 0.9
2022 0.9
Years 2023 through 2027 $ 3.6