Earnings Per Share (Calculation Of Earnings Per Common Share On Basic And Diluted) (Details) (USD $) In Millions, except Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Net income from continuing operations attributable to Cliffs shareholders	$ 607.0	$ 298.1	$ 1,439.3	$ 637.4
Loss from discontinued operations	(17.5)	(0.7)	(18.7)	(2.0)
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	$ 589.5	$ 297.4	$ 1,420.6	$ 635.4
Weighted average number of shares:
Basic	144,203,000	135,345,000	139,563,000	135,280,000
Employee stock plans	800,000	900,000	800,000	800,000
Diluted	144,989,000	136,213,000	140,321,000	136,098,000
Continuing operations	$ 4.21	$ 2.20	$ 10.31	$ 4.71
Discontinued operations	$ (0.12)		$ (0.13)	$ (0.01)
Earnings per common share attributable to Cliffs shareholders - Basic	$ 4.09	$ 2.20	$ 10.18	$ 4.70
Continuing operations	$ 4.19	$ 2.19	$ 10.25	$ 4.68
Discontinued operations	$ (0.12)	$ (0.01)	$ (0.13)	$ (0.01)
Earnings per common share attributable to Cliffs shareholders - Diluted	$ 4.07	$ 2.18	$ 10.12	$ 4.67

This element represents the income or loss from continuing operations attributable to the parent which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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