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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of net pension expense [Abstract]      
Interest cost on projected benefit obligation $ 1.8 $ 2.3 $ 2.5
Prior service cost (0.1) (0.1) (0.1)
Expected return on plan assets (2.4) (2.8) (2.9)
Net amortization 0.4 0.4 1.5
Net pension (benefit) expense $ (0.3) $ (0.2) $ 1.0