Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Operations and Comprehensive Income (Loss) (Details)

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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