INVENTORIES (Narrative) (Details) - USD ($) $ in Millions |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Asia Pacific Iron Ore [Member] | ||
| Inventory [Line Items] | ||
| Other Inventory, Noncurrent | $ 6.8 | $ 0.0 |
| U.S. Iron Ore [Member] | ||
| Inventory [Line Items] | ||
| Inventory, LIFO Reserve | 87.8 | 119.0 |
| Increase in Inventories due to build up of LIFO layers | $ 118.8 | $ 44.8 |
| X | ||||||||||
- Definition Increase in Inventories due to build up of LIFO layers No definition available.
|
| X | ||||||||||
- Definition Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost. 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 | ||||||||||
- Definition Carrying amount as of the balance sheet date of inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle (such as inventory related to long-term contracts or program rights). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|