INVENTORIES (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Inventory [Line Items] | Ìý | Ìý |
| Effect of LIFO Inventory Increment on Financial Position | $ 34.2 | Ìý |
| Effect of LIFO Inventory Liquidation on Income | Ìý | $ (0.2) |
| Allowance for Obsolete and Surplus Items | 12.7 | 12.6 |
| Mining and Pelletizing [Member] | Ìý | Ìý |
| Inventory [Line Items] | Ìý | Ìý |
| Inventory, LIFO Reserve | $ 101.3 | $ 95.6 |
| X | ||||||||||
- Definition Effect of LIFO Inventory Increment on Financial Position No definition available.
|
| X | ||||||||||
- Definition The effect of liquidating LIFO (last in first out) inventory layers on income. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| 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 Amount of valuation reserve for inventory. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|