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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Operations and Comprehensive Income (Loss) (Details) - USD ($) $ 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
Revenues from product sales and services | $ 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
Cost of goods sold and operating expenses |  |  |  |  |  |  |  |  | (1,414.2) | (1,522.8) | (1,398.4)
Sales margin | $ 126.9 | $ 154.9 | $ 263.0 | $ 30.9 | $ 202.0 | $ 261.6 | $ 284.5 | $ 61.5 | 575.7 | 809.6 | 467.6
Other operating income (expense): |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (119.4) | (113.5) | (102.9)
Miscellaneous - net |  |  |  |  |  |  |  |  | (27.0) | (22.9) | 25.5
Total other operating expense |  |  |  |  |  |  |  |  | (146.4) | (136.4) | (77.4)
Operating income (loss) |  |  |  |  |  |  |  |  | 429.3 | 673.2 | 390.2
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (101.2) | (118.9) | (126.8)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (18.2) | (6.8) | (165.4)
Other non-operating income |  |  |  |  |  |  |  |  | 2.2 | 17.2 | 10.2
Total other expense |  |  |  |  |  |  |  |  | (117.2) | (108.5) | (282.0)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 312.1 | 564.7 | 108.2
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (17.6) | 475.2 | 252.4
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income from continuing operations |  |  |  |  |  |  |  |  | 294.5 | 1,039.9 | 360.6
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (1.7) | 88.2 | 2.5
Net income |  |  |  |  |  |  |  |  | 292.8 | 1,128.1 | 363.1
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (3.9)
Net income attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | 292.8 | 1,128.1 | 367.0
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (34.9) | (244.9) | (4.0)
Total comprehensive income (loss) attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | 257.9 | 883.2 | 363.0
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from product sales and services |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of goods sold and operating expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Sales margin |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other operating income (expense): |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Miscellaneous - net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total other operating expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total other expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | (549.9) | (883.7) | (524.4)
Income from continuing operations |  |  |  |  |  |  |  |  | (549.9) | (883.7) | (524.4)
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income |  |  |  |  |  |  |  |  |  |  | (524.4)
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 0.0
Net income attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | (549.9) | (883.7) | (524.4)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 18.9 | 280.8 | (8.1)
Total comprehensive income (loss) attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | (531.0) | (602.9) | (532.5)
Parent [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from product sales and services |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of goods sold and operating expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Sales margin |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other operating income (expense): |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (100.7) | (86.1) | (77.2)
Miscellaneous - net |  |  |  |  |  |  |  |  | 0.1 | (0.3) | (2.3)
Total other operating expense |  |  |  |  |  |  |  |  | (100.6) | (86.4) | (79.5)
Operating income (loss) |  |  |  |  |  |  |  |  | (100.6) | (86.4) | (79.5)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (99.4) | (117.6) | (126.8)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (18.2) | (6.8) | (165.4)
Other non-operating income |  |  |  |  |  |  |  |  | (4.0) | (3.5) | (4.0)
Total other expense |  |  |  |  |  |  |  |  | (121.6) | (127.9) | (296.2)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (222.2) | (214.3) | (375.7)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (17.0) | 474.7 | 251.4
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 531.6 | 858.2 | 512.6
Income from continuing operations |  |  |  |  |  |  |  |  | 292.4 | 1,118.6 | 388.3
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0.4 | 9.5 | (21.3)
Net income |  |  |  |  |  |  |  |  |  |  | 367.0
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 0.0
Net income attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | 292.8 | 1,128.1 | 367.0
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (34.9) | (244.9) | (4.0)
Total comprehensive income (loss) attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | 257.9 | 883.2 | 363.0
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from product sales and services |  |  |  |  |  |  |  |  | 1,989.9 | 2,332.4 | 1,866.0
Cost of goods sold and operating expenses |  |  |  |  |  |  |  |  | (1,414.2) | (1,522.8) | (1,398.4)
Sales margin |  |  |  |  |  |  |  |  | 575.7 | 809.6 | 467.6
Other operating income (expense): |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (18.3) | (27.1) | (19.9)
Miscellaneous - net |  |  |  |  |  |  |  |  | (26.0) | (26.9) | 11.0
Total other operating expense |  |  |  |  |  |  |  |  | (44.3) | (54.0) | (8.9)
Operating income (loss) |  |  |  |  |  |  |  |  | 531.4 | 755.6 | 458.7
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (2.3) | (2.1) | (1.0)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income |  |  |  |  |  |  |  |  | (12.9) | 0.9 | (3.0)
Total other expense |  |  |  |  |  |  |  |  | (15.2) | (1.2) | (4.0)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 516.2 | 754.4 | 454.7
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (0.4) | 0.0 | 1.3
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 18.3 | 25.5 | 11.8
Income from continuing operations |  |  |  |  |  |  |  |  | 534.1 | 779.9 | 467.8
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (0.3) | 12.3 | 1.7
Net income |  |  |  |  |  |  |  |  |  |  | 469.5
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | (3.9)
Net income attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | 533.8 | 792.2 | 473.4
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (35.8) | (24.1) | 12.9
Total comprehensive income (loss) attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | 498.0 | 768.1 | 486.3
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from product sales and services |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of goods sold and operating expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Sales margin |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other operating income (expense): |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (0.4) | (0.3) | (5.8)
Miscellaneous - net |  |  |  |  |  |  |  |  | (1.1) | 4.3 | 16.8
Total other operating expense |  |  |  |  |  |  |  |  | (1.5) | 4.0 | 11.0
Operating income (loss) |  |  |  |  |  |  |  |  | (1.5) | 4.0 | 11.0
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | 0.5 | 0.8 | 1.0
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income |  |  |  |  |  |  |  |  | 19.1 | 19.8 | 17.2
Total other expense |  |  |  |  |  |  |  |  | 19.6 | 20.6 | 18.2
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 18.1 | 24.6 | 29.2
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (0.2) | 0.5 | (0.3)
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income from continuing operations |  |  |  |  |  |  |  |  | 17.9 | 25.1 | 28.9
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (1.8) | 66.4 | 22.1
Net income |  |  |  |  |  |  |  |  |  |  | 51.0
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 0.0
Net income attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | 16.1 | 91.5 | 51.0
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 16.9 | (256.7) | (4.8)
Total comprehensive income (loss) attributable to Cliffs shareholders |  |  |  |  |  |  |  |  | $ 33.0 | $ (165.2) | $ 46.2

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