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COMMITMENTS AND CONTINGENCIES - Contingencies (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Environmental obligations $ 41.4 $ 2.0
Less current portion 6.5 0.3
Long-term environmental obligations 34.9 $ 1.7
Hamilton Plant [Member]    
Loss Contingencies [Line Items]    
Environmental obligations 0.7  
Ashland Works Coke Plant [Member]    
Loss Contingencies [Line Items]    
Environmental obligations $ 1.4