Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
REVENUES FROM PRODUCT SALES AND SERVICES                        
Product                   $ 2,089.2 $ 1,913.5 $ 1,832.4
Freight and venture partners' cost reimbursements                   241.0 195.5 180.9
TOTAL REVENUES $ 600.9 $ 698.4 $ 569.3 $ 461.6 $ 754.0 $ 553.3 $ 496.2 $ 305.5   2,330.2 2,109.0 2,013.3
COST OF GOODS SOLD AND OPERATING EXPENSES                   (1,828.5) (1,719.7) (1,776.8)
SALES MARGIN 100.7 160.2 145.1 95.7 181.5 85.4 91.5 30.9   501.7 389.3 236.5
OTHER OPERATING INCOME (EXPENSE)                        
Selling, general and administrative expenses                   (105.8) (117.8) (110.0)
Miscellaneous - net                   27.7 (30.7) 24.8
Other operating expense                   (78.1) (148.5) (85.2)
OPERATING INCOME                   423.6 240.8 151.3
OTHER INCOME (EXPENSE)                        
Interest expense, net                   (132.0) (200.5) (228.5)
Gain (loss) on extinguishment/restructuring of debt               174.3   (165.4) 166.3 392.9
Other non-operating income (expense)                   3.2 0.4 (2.6)
TOTAL OTHER INCOME (EXPENSE)                   (294.2) (33.8) 161.8
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES                   129.4 207.0 313.1
INCOME TAX BENEFIT                   252.4 12.2 (169.3)
EQUITY IN INCOME OF SUBSIDIARIES                   0.0 0.0 0.0
EQUITY LOSS FROM VENTURES, net of tax                   0.0 0.0 (0.1)
INCOME FROM CONTINUING OPERATIONS 315.0 20.6 76.5 (30.3) $ 100.1 (25.1) 29.9 114.3   381.8 219.2 143.7
LOSS FROM DISCONTINUED OPERATIONS, net of tax                   (18.7) (19.9) (892.1)
NET INCOME (LOSS)                   363.1 199.3 (748.4)
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                   3.9 (25.2) (0.9)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS $ 309.9 $ 53.4 $ 31.8 $ (28.1)   $ (25.8) $ 12.8 $ 108.0 $ 79.1 367.0 174.1 (749.3)
PREFERRED STOCK DIVIDENDS                   0.0 0.0 (38.4)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS                   367.0 174.1 (787.7)
OTHER COMPREHENSIVE INCOME                   (4.0) (3.3) 266.2
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   363.0 170.8 (521.5)
Consolidation, Eliminations [Member]                        
REVENUES FROM PRODUCT SALES AND SERVICES                        
Product                   0.0 0.0 0.0
Freight and venture partners' cost reimbursements                   0.0 0.0 0.0
TOTAL REVENUES                   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
Other operating expense                   0.0 0.0 0.0
OPERATING INCOME                   0.0 0.0 0.0
OTHER INCOME (EXPENSE)                        
Interest expense, net                   0.0 0.0 0.0
Gain (loss) on extinguishment/restructuring of debt                   0.0 0.0 0.0
Other non-operating income (expense)                   0.0 0.0 0.0
TOTAL OTHER INCOME (EXPENSE)                   0.0 0.0 0.0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES                   0.0 0.0 0.0
INCOME TAX BENEFIT                   0.0 0.0 0.0
EQUITY IN INCOME OF SUBSIDIARIES                   (524.4) (333.3) 488.3
EQUITY LOSS FROM VENTURES, net of tax                       0.0
INCOME FROM CONTINUING OPERATIONS                   (524.4) (333.3) 488.3
LOSS FROM DISCONTINUED OPERATIONS, net of tax                   0.0 0.0 0.0
NET INCOME (LOSS)                   (524.4) (333.3) 488.3
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                   0.0 0.0 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   (524.4) (333.3) 488.3
PREFERRED STOCK DIVIDENDS                       0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS                       488.3
OTHER COMPREHENSIVE INCOME                   (7.6) 6.9 (196.4)
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   (532.0) (326.4) 291.9
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                        
REVENUES FROM PRODUCT SALES AND SERVICES                        
Product                   444.6 533.9 464.3
Freight and venture partners' cost reimbursements                   19.6 20.6 23.6
TOTAL REVENUES                   464.2 554.5 487.9
COST OF GOODS SOLD AND OPERATING EXPENSES                   (427.9) (440.9) (478.5)
SALES MARGIN                   36.3 113.6 9.4
OTHER OPERATING INCOME (EXPENSE)                        
Selling, general and administrative expenses                   0.3 0.9 (0.3)
Miscellaneous - net                   17.6 (14.3) 20.1
Other operating expense                   17.9 (13.4) 19.8
OPERATING INCOME                   54.2 100.2 29.2
OTHER INCOME (EXPENSE)                        
Interest expense, net                   (4.2) (6.1) (7.0)
Gain (loss) on extinguishment/restructuring of debt                   0.0 0.0 0.0
Other non-operating income (expense)                   0.0 0.5 110.8
TOTAL OTHER INCOME (EXPENSE)                   (4.2) (5.6) 103.8
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES                   50.0 94.6 133.0
INCOME TAX BENEFIT                   (0.3) 4.9 26.1
EQUITY IN INCOME OF SUBSIDIARIES                   0.0 0.0 0.0
EQUITY LOSS FROM VENTURES, net of tax                       (0.1)
INCOME FROM CONTINUING OPERATIONS                   49.7 99.5 159.0
LOSS FROM DISCONTINUED OPERATIONS, net of tax                   0.9 (5.4) 75.2
NET INCOME (LOSS)                   50.6 94.1 234.2
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                   0.0 0.0 7.7
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   50.6 94.1 241.9
PREFERRED STOCK DIVIDENDS                       0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS                       241.9
OTHER COMPREHENSIVE INCOME                   (5.2) 13.8 176.4
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   45.4 107.9 418.3
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                        
REVENUES FROM PRODUCT SALES AND SERVICES                        
Product                   1,644.6 1,379.6 1,368.1
Freight and venture partners' cost reimbursements                   221.4 174.9 157.3
TOTAL REVENUES                   1,866.0 1,554.5 1,525.4
COST OF GOODS SOLD AND OPERATING EXPENSES                   (1,400.6) (1,278.8) (1,298.3)
SALES MARGIN                   465.4 275.7 227.1
OTHER OPERATING INCOME (EXPENSE)                        
Selling, general and administrative expenses                   (24.7) (20.8) (21.2)
Miscellaneous - net                   12.3 (10.8) (3.0)
Other operating expense                   (12.4) (31.6) (24.2)
OPERATING INCOME                   453.0 244.1 202.9
OTHER INCOME (EXPENSE)                        
Interest expense, net                   (1.0) 0.6 (0.1)
Gain (loss) on extinguishment/restructuring of debt                   0.0 0.0 0.0
Other non-operating income (expense)                   3.1 0.4 1.2
TOTAL OTHER INCOME (EXPENSE)                   2.1 1.0 1.1
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES                   455.1 245.1 204.0
INCOME TAX BENEFIT                   1.3 3.0 (176.3)
EQUITY IN INCOME OF SUBSIDIARIES                   11.8 13.7 12.9
EQUITY LOSS FROM VENTURES, net of tax                       0.0
INCOME FROM CONTINUING OPERATIONS                   468.2 261.8 40.6
LOSS FROM DISCONTINUED OPERATIONS, net of tax                   1.7 2.6 (762.2)
NET INCOME (LOSS)                   469.9 264.4 (721.6)
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                   3.9 (25.2) (8.6)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   473.8 239.2 (730.2)
PREFERRED STOCK DIVIDENDS                       0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS                       (730.2)
OTHER COMPREHENSIVE INCOME                   12.8 (20.7) 20.0
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   486.6 218.5 (710.2)
Parent [Member] | Reportable Legal Entities [Member]                        
REVENUES FROM PRODUCT SALES AND SERVICES                        
Product                   0.0 0.0 0.0
Freight and venture partners' cost reimbursements                   0.0 0.0 0.0
TOTAL REVENUES                   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                   (81.4) (97.9) (88.5)
Miscellaneous - net                   (2.2) (5.6) 7.7
Other operating expense                   (83.6) (103.5) (80.8)
OPERATING INCOME                   (83.6) (103.5) (80.8)
OTHER INCOME (EXPENSE)                        
Interest expense, net                   (126.8) (195.0) (221.4)
Gain (loss) on extinguishment/restructuring of debt                   (165.4) 166.3 392.9
Other non-operating income (expense)                   0.1 (0.5) (114.6)
TOTAL OTHER INCOME (EXPENSE)                   (292.1) (29.2) 56.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES                   (375.7) (132.7) (23.9)
INCOME TAX BENEFIT                   251.4 4.3 (19.1)
EQUITY IN INCOME OF SUBSIDIARIES                   512.6 319.6 (501.2)
EQUITY LOSS FROM VENTURES, net of tax                       0.0
INCOME FROM CONTINUING OPERATIONS                   388.3 191.2 (544.2)
LOSS FROM DISCONTINUED OPERATIONS, net of tax                   (21.3) (17.1) (205.1)
NET INCOME (LOSS)                   367.0 174.1 (749.3)
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                   0.0 0.0 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   367.0 174.1 (749.3)
PREFERRED STOCK DIVIDENDS                       (38.4)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS                       (787.7)
OTHER COMPREHENSIVE INCOME                   (4.0) (3.3) 266.2
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS                   $ 363.0 $ 170.8 $ (521.5)