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STOCK COMPENSATION PLANS (Schedule of Compensation Costs) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  |  |  |  | $ (3.7) | $ 0.0 | $ 0.0
Share-based Payment Arrangement, Expense, after Tax |  |  |  |  |  |  |  |  | $ 13.9 | $ 15.1 | $ 18.2
Earnings (loss) per common share attributable to Cliffs common shareholders - basic: | $ 0.23 | $ 0.34 | $ 0.59 | $ (0.08) | $ 2.06 | $ 1.47 | $ 0.55 | $ (0.29) | $ 1.06 | $ 3.80 | $ 1.28
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted: | $ 0.23 | $ 0.33 | $ 0.57 | $ (0.08) | $ 1.98 | $ 1.41 | $ 0.55 | $ (0.29) | 1.03 | 3.71 | 1.26
Share-based Payment Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per common share attributable to Cliffs common shareholders - basic: |  |  |  |  |  |  |  |  | 0.05 | 0.05 | 0.06
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted: |  |  |  |  |  |  |  |  | $ 0.05 | $ 0.05 | $ 0.06
Cost of goods sold and operating expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | $ 2.0 | $ 1.7 | $ 1.9
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | 15.6 | 13.4 | 16.3
Operating Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | $ 17.6 | $ 15.1 | $ 18.2

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