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RELATED PARTIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Related Party Transactions [Abstract] |
Summary Of Other Ownership Interests | December 31, 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)
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Product revenues from related parties | $ | 806.7 |  |  | $ | 830.1 |  |  | $ | 671.1 |
Total product revenues | 2,089.2 |  |  | 1,913.5 |  |  | 1,832.4 |
Related party product revenue as a percent of total product revenue | 38.6 | % |  | 43.4 | % |  | 36.6 | %
Summary of Balance Sheet Presentation [Table Text Block] | The following table presents the classification of related party assets and liabilities in the Statements of Consolidated Financial Position as of December 31, 2017 and 2016:
| (In Millions)
| Balance Sheet Location |  | December 31, 2017 |  | December 31, 2016
Amounts due from related parties | Accounts receivable, net |  | $ | 68.1 |  |  | $ | 46.9 |
Customer supply agreements and provisional pricing agreements | Derivative assets |  | 37.9 |  |  | 26.8 |
Amounts due to related parties | Partnership distribution payable |  | (44.2 | ) |  | (8.7 | )
Amounts due to related parties | Other current liabilities |  | (12.3 | ) |  | — |
Amounts due to related parties | Other liabilities |  | (41.4 | ) |  | — |
Net amounts due from related parties |  |  | $ | 8.1 |  |  | $ | 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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