Annual report pursuant to Section 13 and 15(d)

INVENTORIES (Narrative) (Details)

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INVENTORIES (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Effect of LIFO Inventory Increment on Financial Position $ 34.2  
Effect of LIFO Inventory Liquidation on Income   $ (0.2)
Allowance for Obsolete and Surplus Items 12.7 12.6
Mining and Pelletizing [Member]    
Inventory [Line Items]    
Inventory, LIFO Reserve $ 101.3 $ 95.6