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PENSION PLANS AND OTHER BENEFITS (Summary of Components of Net Pension Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net pension expense [Abstract]      
Interest cost on projected benefit obligation $ 1.7 $ 1.6 $ 1.8
Prior service cost (0.1) (0.1) (0.1)
Expected return on plan assets (2.2) (2.5) (2.4)
Net amortization 0.5 0.3 0.4
Net periodic pension benefit $ (0.1) $ (0.7) $ (0.3)