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SHAREHOLDERS' EQUITY Schedule of Shareholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders' Equity Attributable to Parent | $ (1,932.0) |  | $ (1,932.0) |  | $ (1,431.3) |
Stockholders' Equity Attributable to Noncontrolling Interest | 172.5 |  | 172.5 |  | (303.0) |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (1,759.5) | $ (177.3) | (1,759.5) | $ (177.3) | (1,734.3) | $ 6,884.3
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | 10.6 | (5,879.6) | (689.0) | (5,939.0) |  |
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST | (4.6) | (1,007.6) | (1.5) | (1,004.4) |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 6.0 | (6,887.2) | (690.5) | (6,943.4) |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 14.4 | (5,960.8) | (468.3) | (5,927.5) |  |
Other Comprehensive Income (Loss), Net of Tax | 4.5 | (80.7) | 211.4 | 13.1 |  |
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST | (0.7) | (0.5) | 9.3 | (1.6) |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  | (479.1) | (6,930.3) |  |
Deconsolidation, Gain (Loss), Amount |  |  | (528.2) |  |  |
Stock and Other Incentive Plans |  |  | 6.0 | (3.4) |  |
Preferred share dividends |  |  | (38.4) | (107.9) |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | (40.7) |  |  |
Undistributed Gains To Noncontrolling Interest |  |  | (1.2) | (20.0) |  |
Cliffs Shareholders Equity [Member] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (1,932.0) | 30.7 | (1,932.0) | 30.7 | (1,431.3) | 6,069.5
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  | (689.0) | (5,939.0) |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  | 220.7 | 11.5 |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  | (468.3) | (5,927.5) |  |
Deconsolidation, Gain (Loss), Amount |  |  | 0.0 |  |  |
Stock and Other Incentive Plans |  |  | 6.0 | (3.4) |  |
Preferred share dividends |  |  | (38.4) | (107.9) |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | 0.0 |  |  |
Undistributed Gains To Noncontrolling Interest |  |  | 0.0 | 0.0 |  |
Noncontrolling Interest [Member] |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | $ 172.5 | $ (208.0) | 172.5 | (208.0) | $ (303.0) | $ 814.8
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  | (1.5) | (1,004.4) |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest |  |  | (9.3) | 1.6 |  |
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST |  |  | (10.8) | (1,002.8) |  |
Deconsolidation, Gain (Loss), Amount |  |  | (528.2) |  |  |
Stock and Other Incentive Plans |  |  | 0.0 | 0.0 |  |
Preferred share dividends |  |  | 0.0 | 0.0 |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | (40.7) |  |  |
Undistributed Gains To Noncontrolling Interest |  |  | $ (1.2) | $ (20.0) |  |

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