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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies) | 3 Months Ended
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Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule Of Subsidiaries | Basis of Consolidation The unaudited condensed consolidated financial statements include our accounts and the accounts of our wholly-owned subsidiaries, including the following operations as of March 31, 2019:
Name |  | Location |  | Business Segment |  | Status of Operations
Northshore |  | Minnesota |  | Mining and Pelletizing |  | Active
United Taconite |  | Minnesota |  | Mining and Pelletizing |  | Active
Tilden |  | Michigan |  | Mining and Pelletizing |  | Active
Empire |  | Michigan |  | Mining and Pelletizing |  | Indefinitely Idled
Toledo HBI |  | Ohio |  | Metallics |  | Construction Stage
Intercompany transactions and balances are eliminated upon consolidation.
Equity Method Investments | Equity Method Investments Our 23% ownership interest in Hibbing is recorded as an equity method investment. As of March 31, 2019 and December 31, 2018, our investment in Hibbing was $10.8 million and $15.4 million, respectively, classified as Other liabilities in the Statements of Unaudited Condensed Consolidated Financial Position.
Significant Accounting Policies | Significant Accounting Policies A detailed description of our significant accounting policies can be found in the audited financial statements for the fiscal year ended December 31, 2018 included in our Annual Report on Form 10-K filed with the SEC. There have been no material changes in our significant accounting policies and estimates from those disclosed therein.

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