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Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Subsidiaries) (Details)

v3.8.0.1
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Subsidiaries) (Details)
3 Months Ended
Mar. 31, 2018
Northshore [Member] Ìý
Related Party Transaction [Line Items] Ìý
Entity Address, State or Province Minnesota
United Taconite [Member] Ìý
Related Party Transaction [Line Items] Ìý
Entity Address, State or Province Minnesota
Tilden [Member] Ìý
Related Party Transaction [Line Items] Ìý
Entity Address, State or Province Michigan
Empire [Member] Ìý
Related Party Transaction [Line Items] Ìý
Entity Address, State or Province Michigan
Koolyanobbing [Member] Ìý
Related Party Transaction [Line Items] Ìý
Entity Address, State or Province Western Australia