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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) QUARTERLY RESULTS OF OPERATIONS (Schedule of Quarterly Financial Information) (Tables) (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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,284.7 us-gaap_Revenues | $ 1,298.2 us-gaap_Revenues | $ 1,100.8 us-gaap_Revenues | $ 940.0 us-gaap_Revenues | $ 1,515.8 us-gaap_Revenues | $ 1,546.6 us-gaap_Revenues | $ 1,488.5 us-gaap_Revenues | $ 1,140.5 us-gaap_Revenues | $ 4,623.7 us-gaap_Revenues | $ 5,691.4 us-gaap_Revenues | $ 5,872.7 us-gaap_Revenues
SALES MARGIN | 168.7 us-gaap_GrossProfit | 127.5 us-gaap_GrossProfit | 92.0 us-gaap_GrossProfit | 63.2 us-gaap_GrossProfit | 294.5 us-gaap_GrossProfit | 348.7 us-gaap_GrossProfit | 268.2 us-gaap_GrossProfit | 237.9 us-gaap_GrossProfit | 451.4 us-gaap_GrossProfit | 1,149.3 us-gaap_GrossProfit | 1,172.1 us-gaap_GrossProfit
Income (Loss) from Continuing Operations Attributable to Parent | (1,285.1)us-gaap_IncomeLossFromContinuingOperations | (5,879.6)us-gaap_IncomeLossFromContinuingOperations | 10.9 us-gaap_IncomeLossFromContinuingOperations | (70.3)us-gaap_IncomeLossFromContinuingOperations | 43.3 us-gaap_IncomeLossFromContinuingOperations | 115.2 us-gaap_IncomeLossFromContinuingOperations | 146.0 us-gaap_IncomeLossFromContinuingOperations | 107.0 us-gaap_IncomeLossFromContinuingOperations | (7,224.2)us-gaap_IncomeLossFromContinuingOperations | 411.5 us-gaap_IncomeLossFromContinuingOperations | (935.3)us-gaap_IncomeLossFromContinuingOperations
INCOME and GAIN ON SALE FROM DISCONTINUED OPERATIONS, net of tax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2.0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2.0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 35.9 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (1,285.1)us-gaap_NetIncomeLoss | (5,879.6)us-gaap_NetIncomeLoss | 10.9 us-gaap_NetIncomeLoss | (70.3)us-gaap_NetIncomeLoss | 43.3 us-gaap_NetIncomeLoss | 117.2 us-gaap_NetIncomeLoss | 146.0 us-gaap_NetIncomeLoss | 107.0 us-gaap_NetIncomeLoss | (7,224.2)us-gaap_NetIncomeLoss | 413.5 us-gaap_NetIncomeLoss | (899.4)us-gaap_NetIncomeLoss
Dividends, Preferred Stock | 12.8 us-gaap_DividendsPreferredStock | 12.8 us-gaap_DividendsPreferredStock | 12.8 us-gaap_DividendsPreferredStock | 12.8 us-gaap_DividendsPreferredStock |  |  |  |  | 51.2 us-gaap_DividendsPreferredStock | 48.7 us-gaap_DividendsPreferredStock | 0 us-gaap_DividendsPreferredStock
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS | $ (1,297.9)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (5,892.4)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (1.9)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (83.1)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |  | $ (7,275.4)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 364.8 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (899.4)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Continuing operations | $ (8.48)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (38.49)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.54)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.20 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.67 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.87 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.66 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (47.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.39 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (6.57)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.25 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Earnings Per Share, Basic | $ (8.48)us-gaap_EarningsPerShareBasic | $ (38.49)us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.54)us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ 0.87 us-gaap_EarningsPerShareBasic | $ 0.66 us-gaap_EarningsPerShareBasic | $ (47.52)us-gaap_EarningsPerShareBasic | $ 2.40 us-gaap_EarningsPerShareBasic | $ (6.32)us-gaap_EarningsPerShareBasic
Continuing operations | $ (8.48)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (38.49)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.54)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.20 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.65 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.82 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.66 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (47.52)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.36 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (6.57)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.25 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Earnings Per Share, Diluted | $ (8.48)us-gaap_EarningsPerShareDiluted | $ (38.49)us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ (0.54)us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.66 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 0.66 us-gaap_EarningsPerShareDiluted | $ (47.52)us-gaap_EarningsPerShareDiluted | $ 2.37 us-gaap_EarningsPerShareDiluted | $ (6.32)us-gaap_EarningsPerShareDiluted

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