Quarterly report pursuant to Section 13 or 15(d)

VARIABLE INTEREST ENTITIES (Details)

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VARIABLE INTEREST ENTITIES (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]        
Net Income (Loss) Attributable to Noncontrolling Interest $ 3.5 $ 0.0    
Cash and cash equivalents 186.9 $ 430.2 $ 352.6 $ 823.2
Inventories 2,148.8   317.4  
Property, plant and equipment, net 4,549.8   1,929.0  
Accounts payable 825.3   193.2  
Noncontrolling interest 327.8   $ 0.0  
SunCoke Middletown [Member] | Variable Interest Entity, Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Net Income (Loss) Attributable to Noncontrolling Interest 3.5      
Cash and cash equivalents 0.8      
Inventories 22.7      
Property, plant and equipment, net 313.6      
Accounts payable 10.0      
Other Assets (Liabilities), Net (0.2)      
Noncontrolling interest $ 326.9