Annual report pursuant to Section 13 and 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Asset Retirement Obligation Disclosure) (Details)

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ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Asset Retirement Obligation Disclosure) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accrual for Environmental Loss Contingencies $ 2.9 $ 2.8  
Mine Reclamation and Closing Liability, current and noncurrent 197.2 204.0  
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent 200.1 206.8  
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current 3.6 12.9  
Environmental Loss Contingency And Mine Reclamation And Closing Liability Noncurrent 196.5 193.9  
Asset Retirement Obligation 197.2 204.0 $ 230.4
Asset Retirement Obligation, Accretion Expense 14.9 14.0  
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss) 1.5 (0.2)  
Asset Retirement Obligation, Liabilities Settled (5.6) (2.2)  
Asset Retirement Obligation, Revision of Estimate (17.6) (38.0)  
Previously Owned Or Operating Facilities [Member] | LTV Steel Mining Company [Member]      
Mine Reclamation and Closing Liability, current and noncurrent 28.6 25.5  
U.S. Iron Ore [Member] | Owned Or Operating Facilities [Member]      
Mine Reclamation and Closing Liability, current and noncurrent 168.4 187.8  
Asia Pacific Iron Ore [Member] | Owned Or Operating Facilities [Member]      
Mine Reclamation and Closing Liability, current and noncurrent $ 28.8 $ 16.2