OTHER LONG-TERM LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Long-Term Liabilities [Abstract]
Environmental liabilities	$ 140.5	$ 119.9
Defined benefit pension plan liabilities	73.5	73.8
Early railcar return liability	13.9	17.6
Post-retirement medical plan liabilities	22.0	17.5
Other	17.1	4.1
Other long-term liabilities	$ 267.0	$ 232.9