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OTHER LONG-TERM LIABILITIES
 12 Months Ended
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]  
OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES
Other long-term liabilities consisted of the following: 
(in millions)December 31, 2020December 31, 2019
Environmental liabilities$140.5 $119.9 
Defined benefit pension plan liabilities73.5 73.8 
Post-retirement medical plan liabilities 22.0 17.5 
Early railcar return liability 13.9 17.6 
Other17.1 4.1 
Total other long-term liabilities$267.0 $232.9