Cleveland-Cliffs Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Segment Reporting (Schedule Of Revenue And Long Lived Assets By Geographic Location) (Details)

Segment Reporting (Schedule Of Revenue And Long Lived Assets By Geographic Location) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue	$ 1,662.5	$ 2,142.8	$ 1,805.8	$ 1,183.2	$ 1,424.1	$ 1,346.0	$ 1,184.3	$ 727.7	$ 6,794.3	$ 4,682.1	$ 2,342.0
Long-lived assets	10,524.6				3,979.2				10,524.6	3,979.2
United States [Member]
Revenue									2,774.1	1,966.3	1,049.5
Long-lived assets	2,684.9				2,498.8				2,684.9	2,498.8
China [Member]
Revenue									2,123.4	1,262.0	711.5
Canada [Member]
Revenue									914.3	696.5	236.6
Long-lived assets	6,701.4				506.7				6,701.4	506.7
Japan [Member]
Revenue									460.4	311.1	157.4
Other Countries [Member]
Revenue									522.1	446.2	187.0
Australia [Member]
Long-lived assets	$ 1,138.3				$ 973.7				$ 1,138.3	$ 973.7

- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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