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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | $ (116.8) | $ (102.9) | $ (115.8)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 564.7 | 108.2 | 110.4
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (475.2) | (252.4) | (12.2)
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 609.5 | $ 437.8 | $ 165.1 | $ (84.3) | $ 309.9 | $ 53.4 | $ 31.8 | $ (28.1) | $ 1,128.1 | $ 367.0 | $ 174.1
Earnings per common share attributable to Cliffs common shareholders - basic: | $ 2.06 | $ 1.47 | $ 0.55 | $ (0.29) | $ 1.04 | $ 0.18 | $ 0.10 | $ (0.11) | $ 3.80 | $ 1.28 | $ 0.88
Earnings per common share attributable to Cliffs common shareholders - diluted: | $ 1.98 | $ 1.41 | $ 0.55 | $ (0.29) | $ 1.03 | $ 0.18 | $ 0.10 | $ (0.11) | $ 3.71 | $ 1.26 | $ 0.87
Deferred Compensation, Share-based Payments [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | $ 1.7 | $ 1.9 | $ 1.8
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (13.4) | (16.3) | (11.8)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 15.1 | 18.2 | 13.6
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | $ 15.1 | $ 18.2 | $ 13.6
Earnings per common share attributable to Cliffs common shareholders - basic: |  |  |  |  |  |  |  |  | $ 0.05 | $ 0.06 | $ 0.07
Earnings per common share attributable to Cliffs common shareholders - diluted: |  |  |  |  |  |  |  |  | $ 0.05 | $ 0.06 | $ 0.07

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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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