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Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

v3.5.0.2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Facility
Transaction Gains and Losses Resulting from Remeasurement [Member] 听 听 听 听 听
Related Party Transaction [Line Items] 听 听 听 听 听
Foreign Currency Transaction Gain (Loss), before Tax $ 0.2 $ (0.8) $ (0.9) $ 12.7 听
Short-term intercompany loan [Member] 听 听 听 听 听
Related Party Transaction [Line Items] 听 听 听 听 听
Foreign Currency Transaction Gain (Loss), before Tax 听 听 听 12.4 听
Cash and Cash Equivalents [Member] 听 听 听 听 听
Related Party Transaction [Line Items] 听 听 听 听 听
Foreign Currency Transaction Gain (Loss), before Tax 0.5 $ (0.7) 1.5 $ 0.7 听
Liability [Member] 听 听 听 听 听
Related Party Transaction [Line Items] 听 听 听 听 听
Foreign Currency Transaction Gain (Loss), before Tax (0.2) 听 (2.6) 听 听
Low Volatile Metallurgical Coal Mines [Member] | North American Coal [Member] 听 听 听 听 听
Related Party Transaction [Line Items] 听 听 听 听 听
Number of mines (in number of facilities) | Facility 听 听 听 听 2
Hibbing [Member] | Other Noncurrent Liabilities [Member] 听 听 听 听 听
Related Party Transaction [Line Items] 听 听 听 听 听
Equity Method Investments $ 3.7 听 $ 3.7 听 $ (2.4)