Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details)

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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Goodwill [Line Items]      
Goodwill $ 143.3   $ 2.1
Amortization of Intangible Assets 1.1 $ 0.2  
Amortization of Intangible Liability 2.1    
Steel and Manufacturing [Member]      
Goodwill [Line Items]      
Goodwill 141.2    
Mining and Pelletizing [Member]      
Goodwill [Line Items]      
Goodwill $ 2.1   $ 2.1