RELATED PARTIES (Narrative) (Details) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2016
USD ($)
|
Jun. 30, 2016
USD ($)
Facility
|
Jun. 30, 2015
USD ($)
|
Dec. 31, 2015
USD ($)
|
|
| Segment Reporting Information [Line Items] | 听 | 听 | 听 | 听 |
| Due from Related Parties, Current | $ 57.9 | $ 57.9 | 听 | $ 15.8 |
| Due to Related Parties, Current | 25.0 | $ 25.0 | 听 | $ 14.5 |
| U.S. Iron Ore [Member] | 听 | 听 | 听 | 听 |
| Segment Reporting Information [Line Items] | 听 | 听 | 听 | 听 |
| Number of mines (in number of facilities) | Facility | 听 | 5 | 听 | 听 |
| Joint Venture Partners [Member] | U.S. Iron Ore [Member] | 听 | 听 | 听 | 听 |
| Segment Reporting Information [Line Items] | 听 | 听 | 听 | 听 |
| Number of mines (in number of facilities) | Facility | 听 | 3 | 听 | 听 |
| Empire [Member] | Arcelor Mittal [Member] | 听 | 听 | 听 | 听 |
| Segment Reporting Information [Line Items] | 听 | 听 | 听 | 听 |
| Paid Distributions of Partners' Equity Amounts | 17.0 | $ 17.0 | $ 17.1 | 听 |
| Recorded Distributions of Partners' Equity Amounts | $ 24.4 | $ 41.4 | $ 31.7 | 听 |
| X | ||||||||||
- Definition Number of mines No definition available.
|
| X | ||||||||||
- Definition Paid Distributions of Partners' Equity Amounts No definition available.
|
| X | ||||||||||
- Definition Recorded Distributions of Partners' Equity Amounts No definition available.
|
| X | ||||||||||
- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|