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VARIABLE INTEREST ENTITIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]      
Net Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest $ 41.0 $ 0.0 $ 0.0
Cash and cash equivalents 112.0 353.0  
Inventories 3,828.0 317.0  
Property, plant and equipment, net 8,743.0 1,929.0 $ 1,286.0
Accounts Payable, Current (1,575.0) (193.0)  
Stockholders' Equity Attributable to Noncontrolling Interest (323.0) $ 0.0  
Variable Interest Entity, Primary Beneficiary [Member] | SunCoke Middletown [Member]      
Variable Interest Entity [Line Items]      
Net Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest 41.0    
Cash and cash equivalents 5.0    
Inventories 21.0    
Property, plant and equipment, net 308.0    
Accounts Payable, Current (15.0)    
Other Assets (Liabilities), Net (10.0)    
Stockholders' Equity Attributable to Noncontrolling Interest $ (309.0)