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SHAREHOLDERS' EQUITY (Schedule of Shareholders' Equity) (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders' Equity Attributable to Parent | $ (485.0) |  | $ (410.3) | $ (444.3) |
Stockholders' Equity Attributable to Noncontrolling Interest | 0.2 |  | 0.2 | 0.2 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (484.8) | $ (703.0) | $ (410.1) | (444.1) | $ (1,330.5)
Cumulative Effect of New Accounting Principle in Period of Adoption | 34.0 |  |  |  |
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (84.3) | (28.1) |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest | 0.0 | (1.7) |  |  |
Net Loss | (84.3) | (29.8) |  |  |
Other comprehensive income (loss) | 7.7 | (3.0) |  |  |
OTHER COMPREHENSIVE LOSS ATTRIBUTABLE TO THE NONCONTROLLING INTEREST | 0.0 | (5.0) |  |  |
Other Comprehensive Income (Loss), Net of Tax | 7.7 | (8.0) |  |  |
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (76.6) | (31.1) |  |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | (76.6) | (37.8) |  |  |
Stock and Other Incentive Plans | 1.9 | 4.0 |  |  |
Cliffs Shareholders Equity [Member] |  |  |  |  |
Stockholders' Equity Attributable to Parent | (485.0) | (830.1) |  | (444.3) | (1,464.3)
Cumulative Effect of New Accounting Principle in Period of Adoption | 34.0 |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic | (84.3) | (28.1) |  |  |
Other comprehensive income (loss) | 7.7 | (3.0) |  |  |
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (76.6) | (31.1) |  |  |
Stock and Other Incentive Plans | 1.9 | 4.0 |  |  |
Noncontrolling Interest [Member] |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | 0.2 | 127.1 |  | $ 0.2 | $ 133.8
Cumulative Effect of New Accounting Principle in Period of Adoption | 0.0 |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest | 0.0 | (1.7) |  |  |
OTHER COMPREHENSIVE LOSS ATTRIBUTABLE TO THE NONCONTROLLING INTEREST | 0.0 | (5.0) |  |  |
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST | 0.0 | (6.7) |  |  |
Stock and Other Incentive Plans | $ 0.0 | 0.0 |  |  |
Common Stock [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | 661.3 |  |  |
Common Stock [Member] | Cliffs Shareholders Equity [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | 661.3 |  |  |
Common Stock [Member] | Noncontrolling Interest [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 0.0 |  |  |

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