INVENTORIES (Schedule Of Inventories) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Inventory, Net [Abstract]
Finished Goods	$ 334.4	$ 273.1
Work-in Process	71.9	56.5
Total Inventory	406.3	329.6
U.S. Iron Ore [Member]
Inventory, Net [Abstract]
Finished Goods	312.3	252.3
Work-in Process	25.0	11.7
Total Inventory	337.3	264.0
Asia Pacific Iron Ore [Member]
Inventory, Net [Abstract]
Finished Goods	22.1	20.8
Work-in Process	46.9	44.8
Total Inventory	$ 69.0	$ 65.6

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section BB

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant