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OTHER LONG-TERM LIABILITIES (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Long-Term Liabilities [Abstract]    
Environmental liabilities $ 141.9 $ 121.8
Defined benefit pension plan liabilities 73.5 73.8
Post-retirement medical plan liabilities 22.0 17.5
Early railcar return liability 13.9 17.6
East Coast Storage Assets Contingent Consideration 0.0 16.1
Other 17.2 4.1
Total other long-term liabilities $ 268.5 $ 250.9