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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) T in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) T | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) T | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) unit T | Dec. 31, 2018 USD ($) T | Dec. 31, 2017 USD ($) T | Jan. 01, 2018 USD ($) | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 357.9 |  |  |  | $ 424.2 |  |  |  | $ 357.9 | $ 424.2 | $ (444.1) |  | $ (1,330.5)
Number of Reporting Units | unit |  |  |  |  |  |  |  |  | 2 |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | $ 0.0 | 0.0 | (3.9) |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net from product sales and services |  |  |  |  |  |  |  |  | 7.5 | 422.6 | 119.3 |  |
Foreign Currency Transaction Gain (Loss), Realized |  |  |  |  |  |  |  |  | 0.0 | 228.1 | 0.0 |  |
Revenues | $ 534.1 | $ 555.6 | $ 743.2 | $ 157.0 | $ 696.3 | $ 741.8 | $ 714.3 | $ 180.0 | 1,989.9 | 2,332.4 | 1,866.0 |  |
Net income |  |  |  |  |  |  |  |  | $ 292.8 | $ 1,128.1 | $ 363.1 |  |
Hibbing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest, equity method investment | 23.00% |  |  |  |  |  |  |  | 23.00% |  |  |  |
Mining and Pelletizing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Quantity Of Finished Goods at ports | T | 1.0 |  |  |  | 0.8 |  |  |  | 1.0 | 0.8 | 1.5 |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,989.9 | $ 2,332.4 | $ 1,866.0 |  |
Empire [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 132.7 |  |
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | (12.1) |  |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | (3.9) |  |
Acquisition of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | (116.7) |  |
Tilden [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 105.0 |  |
Stockholders' Equity, Period Increase (Decrease) |  |  |  |  |  |  |  |  |  |  | (89.1) |  |
Acquisition of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | $ (15.9) |  |
Other Noncurrent Liabilities [Member] | Hibbing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments | $ (18.0) |  |  |  | $ (15.4) |  |  |  | $ (18.0) | (15.4) |  |  |
Other Current Liabilities [Member] | Empire [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest Purchase, Installment Amount |  |  |  |  | $ 44.2 |  |  |  |  | 44.2 |  |  |
Tilden [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Increase in Ownership Equity |  |  |  |  |  |  |  |  |  |  | 15.00% |  |
Empire [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |
Increase in Ownership Equity |  |  |  |  |  |  |  |  |  |  | 21.00% |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  | $ 34.0 |
Revenues |  |  |  |  |  |  |  |  |  | 68.1 |  |  |
Net income |  |  |  |  |  |  |  |  |  | $ 46.2 |  |  |
Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net from product sales and services |  |  |  |  |  |  |  |  |  |  | $ 120.6 |  |

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