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SHAREHOLDERS' EQUITY (Schedule of Shareholders' Equity) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | $ (444.3) |
Beginning balance |  |  | 0.2 |
Beginning Balance |  |  | (444.1) | $ (1,330.5)
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | 34.0 |
Net Income (Loss) Available to Common Stockholders, Basic |  |  | 80.8 | 3.7
Net Income (Loss) Attributable to Noncontrolling Interest | $ 0.0 | $ (1.7) | 0.0 | (3.4)
NET INCOME | 165.1 | 30.1 | 80.8 | 0.3
Other comprehensive income (loss) | 9.1 | 4.9 | 16.8 | 1.9
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST | 0.0 | 0.4 | 0.0 | (4.6)
Other Comprehensive Income (Loss), Net of Tax | 9.1 | 5.3 | 16.8 | (2.7)
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | 174.2 | 36.7 | 97.6 | 5.6
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  | 97.6 | (2.4)
Stock and Other Incentive Plans |  |  | 6.4 | 8.3
Undistributed Earnings Losses Related to Noncontrolling Interests |  |  | 0.2 | 3.4
Ending balance | (306.3) |  | (306.3) |
Ending balance | 0.0 |  | 0.0 |
Ending Balance | (306.3) | (666.7) | (306.3) | (666.7)
Cliffs Shareholders Equity [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (444.3) | (1,464.3)
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | 34.0 |
Other comprehensive income (loss) |  |  | 16.8 | 1.9
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  | 97.6 | 5.6
Stock and Other Incentive Plans |  |  | 6.4 | 8.3
Undistributed Earnings Losses Related to Noncontrolling Interests |  |  | 0.0 | 0.0
Ending balance | (306.3) | (789.1) | (306.3) | (789.1)
Noncontrolling Interest [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 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 | (3.4)
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST |  |  | 0.0 | (4.6)
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST |  |  | 0.0 | (8.0)
Stock and Other Incentive Plans |  |  | 0.0 | 0.0
Undistributed Earnings Losses Related to Noncontrolling Interests |  |  | 0.2 | 3.4
Ending balance | $ 0.0 | $ 122.4 | $ 0.0 | 122.4
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | 661.3
Common Stock [Member] | Cliffs Shareholders Equity [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | 661.3
Common Stock [Member] | Noncontrolling Interest [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 0.0

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