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RELATED PARTIES (Tables) | 9 Months Ended
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Sep. 30, 2017
Related Party Transactions [Abstract] |
Summary Of Other Ownership Interests | The following is a summary of the mine ownership of the co-owned iron ore mine at September 30, 2017:
Mine |  | Cleveland-Cliffs Inc. |  | ArcelorMittal |  | U.S. Steel
Hibbing |  | 23.0 | % |  | 62.3 | % |  | 14.7 | %
Summary Of Related Party Transactions Table Disclosure | Product revenues from related parties were as follows:
| (In Millions)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Product revenues from related parties | $ | 265.5 |  |  | $ | 223.4 |  |  | $ | 602.4 |  |  | $ | 568.4 |
Total product revenues | $ | 627.5 |  |  | $ | 508.6 |  |  | $ | 1,552.3 |  |  | $ | 1,237.0 |
Related party product revenue as a percent of total product revenue | 42.3 | % |  | 43.9 | % |  | 38.8 | % |  | 45.9 | %
Summary of Balance Sheet Presentation [Table Text Block] | The following table presents the classification of related party assets and liabilities in the Statements of Unaudited Condensed Consolidated Financial Position as of September 30, 2017 and December 31, 2016:
| (In Millions)
| Balance Sheet Location |  | September 30, 2017 |  | December 31, 2016
Amounts due from related parties | Accounts receivable, net |  | $ | 4.5 |  |  | $ | 46.9 |
Amounts due from related parties | Other current assets |  | 3.4 |  |  | — |
Customer supply agreements and provisional pricing agreements | Derivative assets |  | 88.5 |  |  | 26.8 |
Amounts due to related parties | Other current liabilities |  | (45.3 | ) |  | (8.7 | )
Amounts due to related parties | Derivative liabilities |  | (5.4 | ) |  | — |
Amounts due to related parties | Other liabilities |  | (44.2 | ) |  | — |
Net amounts due from related parties |  |  | $ | 1.5 |  |  | $ | 65.0 |

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- Definition Tabular disclosure of other units or shares or classes of ownership in a partnership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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