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

STOCK COMPENSATION PLANS STOCK COMPENSATION PLANS (Schedule of Compensation Costs) (Details)

STOCK COMPENSATION PLANS STOCK COMPENSATION PLANS (Schedule of Compensation Costs) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Selling, General and Administrative Expense									$ 208.7	$ 231.6	$ 282.5
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									(9,603.7)	489.3	(501.8)
Income Tax Expense (Benefit)	(289.7)us-gaap_IncomeTaxExpenseBenefit								(1,302.0)us-gaap_IncomeTaxExpenseBenefit	55.1us-gaap_IncomeTaxExpenseBenefit	255.9us-gaap_IncomeTaxExpenseBenefit
Net Income (Loss) Attributable to Parent	(1,285.1)us-gaap_NetIncomeLoss	(5,879.6)us-gaap_NetIncomeLoss	10.9us-gaap_NetIncomeLoss	(70.3)us-gaap_NetIncomeLoss	43.3us-gaap_NetIncomeLoss	117.2us-gaap_NetIncomeLoss	146.0us-gaap_NetIncomeLoss	107.0us-gaap_NetIncomeLoss	(7,224.2)us-gaap_NetIncomeLoss	413.5us-gaap_NetIncomeLoss	(899.4)us-gaap_NetIncomeLoss
Earnings Per Share, Basic	$ (8.48)us-gaap_EarningsPerShareBasic	$ (38.49)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.54)us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.87us-gaap_EarningsPerShareBasic	$ 0.66us-gaap_EarningsPerShareBasic	$ (47.52)us-gaap_EarningsPerShareBasic	$ 2.40us-gaap_EarningsPerShareBasic	$ (6.32)us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted	$ (8.48)us-gaap_EarningsPerShareDiluted	$ (38.49)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.54)us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.66us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted	$ 0.66us-gaap_EarningsPerShareDiluted	$ (47.52)us-gaap_EarningsPerShareDiluted	$ 2.37us-gaap_EarningsPerShareDiluted	$ (6.32)us-gaap_EarningsPerShareDiluted
Deferred Compensation, Share-based Payments [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Costs and Expenses									7.8	6.3	4.0
Selling, General and Administrative Expense									15.9	14.8	16.6
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									23.7	21.1	20.6
Income Tax Expense (Benefit)									(8.3)	(7.4)	(7.2)
Net Income (Loss) Attributable to Parent									$ 15.4	$ 13.7	$ 13.4
Earnings Per Share, Basic									$ 0.10	$ 0.09	$ 0.09
Earnings Per Share, Diluted									$ 0.10	$ 0.08	$ 0.09

- Definition

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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- Definition

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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- Definition

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

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