OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other Long-Term Liabilities [Abstract]
Environmental liabilities	$ 119.9	$ 135.1
Defined benefit pension plan liabilities	73.8	75.0
Long-term finance lease liabilities	18.4	0.0
Early railcar return liability	17.6	23.3
Post-retirement medical plan liabilities	17.5	19.3
Other	4.1	0.8
Other long-term liabilities	$ 251.3	$ 253.5