Statements Of Condensed Consolidated Operations (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES FROM PRODUCT SALES AND SERVICES
Product	$ 4,230.8us-gaap_SalesRevenueGoodsNet	$ 5,346.6us-gaap_SalesRevenueGoodsNet	$ 5,520.9us-gaap_SalesRevenueGoodsNet
Reimbursement Revenue	392.9us-gaap_ReimbursementRevenue	344.8us-gaap_ReimbursementRevenue	351.8us-gaap_ReimbursementRevenue
TOTAL REVENUES	4,623.7us-gaap_Revenues	5,691.4us-gaap_Revenues	5,872.7us-gaap_Revenues
COST OF GOODS SOLD AND OPERATING EXPENSES	(4,172.3)us-gaap_CostOfGoodsAndServicesSold	(4,542.1)us-gaap_CostOfGoodsAndServicesSold	(4,700.6)us-gaap_CostOfGoodsAndServicesSold
SALES MARGIN	451.4us-gaap_GrossProfit	1,149.3us-gaap_GrossProfit	1,172.1us-gaap_GrossProfit
OTHER OPERATING INCOME (EXPENSE)
Selling, general and administrative expenses	(208.7)	(231.6)	(282.5)
Exploration costs	(8.8)us-gaap_ExplorationExpenseMining	(59.0)us-gaap_ExplorationExpenseMining	(142.8)us-gaap_ExplorationExpenseMining
Impairment of goodwill and other long-lived assets	(9,029.9)us-gaap_AssetImpairmentCharges	(250.8)us-gaap_AssetImpairmentCharges	(1,049.9)us-gaap_AssetImpairmentCharges
Gain (loss) on disposal of other assets	(423.0)us-gaap_GainLossOnSaleOfOtherAssets	16.7us-gaap_GainLossOnSaleOfOtherAssets	1.2us-gaap_GainLossOnSaleOfOtherAssets
Miscellaneous - net	(226.3)us-gaap_OtherOperatingIncomeExpenseNet	46.4us-gaap_OtherOperatingIncomeExpenseNet	(6.9)us-gaap_OtherOperatingIncomeExpenseNet
Other operating expense	(9,896.7)us-gaap_OperatingExpenses	(478.3)us-gaap_OperatingExpenses	(1,480.9)us-gaap_OperatingExpenses
OPERATING INCOME (LOSS)	(9,445.3)us-gaap_OperatingIncomeLoss	671.0us-gaap_OperatingIncomeLoss	(308.8)us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)
Interest expense, net	(185.2)us-gaap_InterestIncomeExpenseNet	(179.1)us-gaap_InterestIncomeExpenseNet	(195.6)us-gaap_InterestIncomeExpenseNet
Other non-operating income (expense)	26.8us-gaap_OtherNonoperatingIncomeExpense	(2.6)us-gaap_OtherNonoperatingIncomeExpense	2.6us-gaap_OtherNonoperatingIncomeExpense
TOTAL OTHER INCOME (EXPENSE)	(158.4)us-gaap_NonoperatingIncomeExpense	(181.7)us-gaap_NonoperatingIncomeExpense	(193.0)us-gaap_NonoperatingIncomeExpense
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY INCOME (LOSS) FROM VENTURES	(9,603.7)	489.3	(501.8)
INCOME TAX BENEFIT (EXPENSE)	1,302.0us-gaap_IncomeTaxExpenseBenefit	(55.1)us-gaap_IncomeTaxExpenseBenefit	(255.9)us-gaap_IncomeTaxExpenseBenefit
EQUITY LOSS FROM VENTURES, net of tax	(9.9)	(74.4)	(404.8)
INCOME (LOSS) FROM CONTINUING OPERATIONS	(8,311.6)	359.8	(1,162.5)
INCOME and GAIN ON SALE FROM DISCONTINUED OPERATIONS, net of tax	0	2.0	35.9
NET INCOME (LOSS)	(8,311.6)us-gaap_ProfitLoss	361.8us-gaap_ProfitLoss	(1,126.6)us-gaap_ProfitLoss
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	1,087.4	51.7	227.2
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	(7,224.2)us-gaap_NetIncomeLoss	413.5us-gaap_NetIncomeLoss	(899.4)us-gaap_NetIncomeLoss
PREFERRED STOCK DIVIDENDS	(51.2)us-gaap_DividendsPreferredStock	(48.7)us-gaap_DividendsPreferredStock	0us-gaap_DividendsPreferredStock
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS	$ (7,275.4)	$ 364.8	$ (899.4)
EARNINGS (LOSS) PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - BASIC
Continuing operations	$ (47.52)	$ 2.39	$ (6.57)
Discontinued operations	$ 0.00	$ 0.01	$ 0.25
Earnings (loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:	$ (47.52)us-gaap_EarningsPerShareBasic	$ 2.40us-gaap_EarningsPerShareBasic	$ (6.32)us-gaap_EarningsPerShareBasic
EARNINGS (LOSS) PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - DILUTED
Continuing operations	$ (47.52)	$ 2.36	$ (6.57)
Discontinued operations	$ 0.00	$ 0.01	$ 0.25
Earnings (loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:	$ (47.52)us-gaap_EarningsPerShareDiluted	$ 2.37us-gaap_EarningsPerShareDiluted	$ (6.32)us-gaap_EarningsPerShareDiluted
AVERAGE NUMBER OF SHARES (IN THOUSANDS)
Basic	153,098	151,726	142,351
Diluted	153,098	174,323	142,351

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