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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Operations and Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Product | $ 220.7 | $ 412.8
Freight and venture partners' cost reimbursements | 18.3 | 48.8
Revenues | 239.0 | 461.6
Cost of Goods and Services Sold | (242.6) | (365.3)
Sales margin | (3.6) | 96.3
Selling, General and Administrative Expense | (27.7) | (27.7)
Miscellaneous - net | (8.7) | 11.5
Other operating expense | (36.4) | (16.2)
Operating Income (Loss) | (40.0) | 80.1
Interest expense, net | (33.5) | (42.8)
Loss on extinguishment of debt | 0.0 | (71.9)
Other non-operating income | 4.4 | 2.5
Other expense | (29.1) | (112.2)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (69.1) | (32.1)
Income Tax Expense (Benefit) | (15.7) | 1.8
Equity in income (loss) of subsidiaries | 0.0 | 0.0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (84.8) | (30.3)
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.5 | 0.5
Net Loss | (84.3) | (29.8)
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST | 0.0 | 1.7
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (84.3) | (28.1)
Other comprehensive income (loss) | 7.7 | (3.0)
TOTAL COMPREHENSIVE LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (76.6) | (31.1)
Reportable Legal Entities [Member] | Cliffs Shareholders Equity [Member] |  |
Product | 0.0 | 0.0
Freight and venture partners' cost reimbursements | 0.0 | 0.0
Revenues | 0.0 | 0.0
Cost of Goods and Services Sold | 0.0 | 0.0
Sales margin | 0.0 | 0.0
Selling, General and Administrative Expense | (20.1) | (19.5)
Miscellaneous - net | (0.2) | (0.1)
Other operating expense | (20.3) | (19.6)
Operating Income (Loss) | (20.3) | (19.6)
Interest expense, net | (31.9) | (41.6)
Loss on extinguishment of debt |  | (71.9)
Other non-operating income | (0.9) | (1.0)
Other expense | (32.8) | (114.5)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (53.1) | (134.1)
Income Tax Expense (Benefit) | (15.6) | 5.2
Equity in income (loss) of subsidiaries | (15.7) | 100.4
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (84.4) | (28.5)
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.1 | 0.4
Net Loss |  | (28.1)
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST |  | 0.0
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (84.3) | (28.1)
Other comprehensive income (loss) | 7.7 | (3.0)
TOTAL COMPREHENSIVE LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (76.6) | (31.1)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |
Product | 169.2 | 247.3
Freight and venture partners' cost reimbursements | 10.8 | 38.9
Revenues | 180.0 | 286.2
Cost of Goods and Services Sold | (118.5) | (237.2)
Sales margin | 61.5 | 49.0
Selling, General and Administrative Expense | (4.3) | (4.4)
Miscellaneous - net | (5.3) | (5.5)
Other operating expense | (9.6) | (9.9)
Operating Income (Loss) | 51.9 | 39.1
Interest expense, net | (0.8) | 0.0
Loss on extinguishment of debt |  | 0.0
Other non-operating income | 0.5 | (0.8)
Other expense | (0.3) | (0.8)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 51.6 | 38.3
Income Tax Expense (Benefit) | (0.1) | (0.8)
Equity in income (loss) of subsidiaries | 4.5 | 3.2
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 56.0 | 40.7
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.2 | 0.2
Net Loss |  | 40.9
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST |  | 1.7
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | 56.2 | 42.6
Other comprehensive income (loss) | 5.9 | 10.8
TOTAL COMPREHENSIVE LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | 62.1 | 53.4
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |
Product | 51.5 | 165.5
Freight and venture partners' cost reimbursements | 7.5 | 9.9
Revenues | 59.0 | 175.4
Cost of Goods and Services Sold | (124.1) | (128.1)
Sales margin | (65.1) | 47.3
Selling, General and Administrative Expense | (3.3) | (3.8)
Miscellaneous - net | (3.2) | 17.1
Other operating expense | (6.5) | 13.3
Operating Income (Loss) | (71.6) | 60.6
Interest expense, net | (0.8) | (1.2)
Loss on extinguishment of debt |  | 0.0
Other non-operating income | 4.8 | 4.3
Other expense | 4.0 | 3.1
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (67.6) | 63.7
Income Tax Expense (Benefit) | 0.0 | (2.6)
Equity in income (loss) of subsidiaries | 0.0 | 0.0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (67.6) | 61.1
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.2 | (0.1)
Net Loss |  | 61.0
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST |  | 0.0
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (67.4) | 61.0
Other comprehensive income (loss) | 0.8 | (17.8)
TOTAL COMPREHENSIVE LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (66.6) | 43.2
Consolidation, Eliminations [Member] |  |
Product | 0.0 | 0.0
Freight and venture partners' cost reimbursements | 0.0 | 0.0
Revenues | 0.0 | 0.0
Cost of Goods and Services Sold | 0.0 | 0.0
Sales margin | 0.0 | 0.0
Selling, General and Administrative Expense | 0.0 | 0.0
Miscellaneous - net | 0.0 | 0.0
Other operating expense | 0.0 | 0.0
Operating Income (Loss) | 0.0 | 0.0
Interest expense, net | 0.0 | 0.0
Loss on extinguishment of debt |  | 0.0
Other non-operating income | 0.0 | 0.0
Other expense | 0.0 | 0.0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 0.0 | 0.0
Income Tax Expense (Benefit) | 0.0 | 0.0
Equity in income (loss) of subsidiaries | 11.2 | (103.6)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 11.2 | (103.6)
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.0 | 0.0
Net Loss |  | (103.6)
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST |  | 0.0
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | 11.2 | (103.6)
Other comprehensive income (loss) | (6.7) | 7.0
TOTAL COMPREHENSIVE LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 4.5 | $ (96.6)

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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