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COMMITMENTS AND CONTINGENCIES- Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Feb. 29, 2020
company
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]          
Number of companies negotiating consent decree | company       3  
Accrued probable future environmental expenditures $ 124.5 $ 119.7 $ 112.0   $ 111.9
Insurance recoveries 4.5 $ 8.7 $ 4.5    
Calvert City          
Loss Contingencies [Line Items]          
Accrued probable future environmental expenditures $ 113.2