Cleveland-Cliffs (CLF) 10-Q 27 Oct 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 24, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	CLIFFS NATURAL RESOURCES INC.
Entity Central Index Key	764,065
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		230,599,846
Trading Symbol	clf

Statements Of Condensed Consoli

Statements Of Condensed Consolidated Financial Position - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash and cash equivalents	$ 132.2	$ 285.2
Accounts receivable, net	49.2	40.2
Inventories	317.3	329.6
Supplies and other inventories	84	110.4
Short-term assets of discontinued operations	0	14.9
Loans to and accounts receivable from the Canadian Entities	69.3	72.9
Insurance coverage receivable	0	93.5
Other current assets	47.6	36
TOTAL CURRENT ASSETS	699.6	982.7
PROPERTY, PLANT AND EQUIPMENT, NET	990.1	1,059
OTHER ASSETS
Other non-current assets	83.2	93.8
TOTAL OTHER ASSETS	83.2	93.8
TOTAL ASSETS	1,772.9	2,135.5
CURRENT LIABILITIES
Accounts payable	81.3	106.3
Accrued expenses	134.2	156
Short-term liabilities of discontinued operations	5.5	6.9
Guarantees	0.2	96.5
Insured loss	0	93.5
Other current liabilities	102.3	122.5
TOTAL CURRENT LIABILITIES	323.5	581.7
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES	198.5	221
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS	220.2	231.2
LONG-TERM DEBT	2,195.9	2,699.4
OTHER LIABILITIES	235.3	213.8
TOTAL LIABILITIES	3,173.4	3,947.1
COMMITMENTS AND CONTINGENCIES (SEE NOTE 20)
CLIFFS SHAREHOLDERS' DEFICIT
Preferred Stock - no par value, Class A - 3,000,000 shares authorized, 7 % Series A Mandatory Convertible, Class A, no par value and $1,000 per share liquidation preference, Issued and Outstanding - no shares (2015 - 731,223 shares), Class B - 4,000,000 shares authorized	0	731.3
Common Shares - par value $0.125 per share, Authorized - 400,000,000 shares (2015 - 400,000,000 shares); Issued - 236,346,794 shares (2015 - 159,546,224 shares); Outstanding - 203,594,581 shares (2015 - 153,591,930 shares)	29.5	19.8
Capital in excess of par value of shares	3,336	2,298.9
Retained deficit	(4,653.4)	(4,748.4)
Cost of 5,752,213 common shares in treasury (2015 - 5,954,294 shares)	(255.2)	(265)
Accumulated other comprehensive loss	(1.2)	(18)
TOTAL CLIFFS SHAREHOLDERS' DEFICIT	(1,544.3)	(1,981.4)
NONCONTROLLING INTEREST	143.8	169.8
TOTAL DEFICIT	(1,400.5)	(1,811.6)
TOTAL LIABILITIES AND DEFICIT	$ 1,772.9	$ 2,135.5

Statements Of Condensed Consol3

Statements Of Condensed Consolidated Financial Position (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Preferred stock, par value	$ 0	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.125	$ 0.125
Common shares, authorized (in shares)	400,000,000	400,000,000
Common shares, issued (in shares)	236,346,794	159,546,224
Common shares, outstanding	230,594,581	153,591,930
Common shares in treasury	5,752,213	5,954,294
Preferred Class A [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Cumulative Mandatory Convertible	7.00%	7.00%
Preferred Stock, Liquidation Preference Per Share	$ 1,000	$ 1,000
Preferred Shares, Issued and Outstanding, Shares	0	731,223
Preferred Class B [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	4,000,000	4,000,000

Statements Of Condensed Consol4

Statements Of Condensed Consolidated Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUES FROM PRODUCT SALES AND SERVICES
Product	$ 508.6	$ 542.5	$ 1,237	$ 1,399.9
Freight and venture partners' cost reimbursements	44.7	50.7	118	137.4
TOTAL REVENUES	553.3	593.2	1,355	1,537.3
COST OF GOODS SOLD AND OPERATING EXPENSES	(467.9)	(538.1)	(1,147.2)	(1,344.1)
SALES MARGIN	85.4	55.1	207.8	193.2
OTHER OPERATING INCOME (EXPENSE)
Selling, general and administrative expenses	(31.1)	(22.4)	(81.8)	(82.2)
Miscellaneous - net	(19.6)	(3.5)	(16.9)	15.8
Other operating expense	(50.7)	(25.9)	(98.7)	(66.4)
OPERATING INCOME	34.7	29.2	109.1	126.8
OTHER INCOME (EXPENSE)
Interest expense, net	(48.7)	(61.7)	(156.2)	(168.2)
Gain (loss) on extinguishment/restructuring of debt	(18.3)	79.2	164.1	392.9
Other non-operating income (expense)	0.1	(0.1)	0.4	(3)
TOTAL OTHER INCOME (EXPENSE)	(66.9)	17.4	8.3	221.7
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(32.2)	46.6	117.4	348.5
INCOME TAX BENEFIT (EXPENSE)	7.1	3.4	1.7	(169.9)
Income (Loss) from Equity Method Investments	0	(0.1)	0	(0.1)
INCOME (LOSS) FROM CONTINUING OPERATIONS	(25.1)	49.9	119.1	178.5
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	(2.7)	(43.9)	(0.6)	(869)
NET INCOME (LOSS)	(27.8)	6	118.5	(690.5)
LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTEREST	2	4.6	(23.5)	1.5
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	(25.8)	10.6	95	(689)
PREFERRED STOCK DIVIDENDS	0	(25.6)	0	(38.4)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS	$ (25.8)	$ (15)	$ 95	$ (727.4)
EARNINGS (LOSS) PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - BASIC
Continuing operations (in dollars per share)	$ (0.11)	$ 0.19	$ 0.51	$ 0.87
Discontinued operations (in dollars per share)	(0.01)	(0.29)	0	(5.62)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share)	(0.12)	(0.10)	0.51	(4.75)
EARNINGS (LOSS) PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - DILUTED
Continuing operations (in dollars per share)	(0.11)	0.19	0.51	0.87
Discontinued operations (in dollars per share)	(0.01)	(0.29)	0	(5.62)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share)	$ (0.12)	$ (0.10)	$ 0.51	$ (4.75)
AVERAGE NUMBER OF SHARES (IN THOUSANDS)
Basic	206.3	153.2	186.5	153.2
Diluted	206.3	153.2	188.5	153.2
CASH DIVIDENDS DECLARED PER DEPOSITARY SHARE (in dollars per share)	$ 0	$ 0.88	$ 0	$ 1.32

Statements Of Condensed Consol5

Statements Of Condensed Consolidated Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST	$ 0	$ 0	$ 0	$ 7.7

Statements Of Condensed Consol6

Statements Of Condensed Consolidated Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	$ (25.8)	$ 10.6	$ 95	$ (689)
OTHER COMPREHENSIVE INCOME (LOSS)
Changes in pension and other post-retirement benefits, net of tax	7.1	6.6	19	36
Unrealized net gain on marketable securities, net of tax	0	0.1	0	1.6
Unrealized net gain (loss) on foreign currency translation	0.9	(11.4)	2.6	157.1
Unrealized net gain (loss) on derivative financial instruments, net of tax	0.7	9.2	(2.6)	16.7
OTHER COMPREHENSIVE INCOME	8.7	4.5	19	211.4
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST	(0.9)	(0.7)	(2.2)	9.3
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	$ (18)	$ 14.4	$ 111.8	$ (468.3)

Statements Of Condensed Consol7

Statements Of Condensed Consolidated Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
NET INCOME (LOSS)	$ 118.5	$ (690.5)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation, depletion and amortization	88.9	99.1
Asset Impairment Charges, Cash Flows	0	76.6
Deferred income taxes	0	160
Gain on extinguishment/restructuring of debt	(164.1)	(392.9)
(Gain) loss on deconsolidation, net of cash deconsolidated	(3.2)	654.8
Other	9	52.7
Changes in operating assets and liabilities:
Receivables and other assets	137.5	293.1
Inventories	21.6	(76.2)
Payables, accrued expenses and other liabilities	(136.1)	(236.2)
Net cash provided (used) by operating activities	72.1	(59.5)
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(45.8)	(57.9)
Other investing activities	6.3	0.7
Net cash used by investing activities	(39.5)	(57.2)
FINANCING ACTIVITIES
Repayment of equipment loans	(95.6)	(36.9)
Distributions of partnership equity	(52.5)	(31.7)
Debt issuance costs	(5.2)	(33.6)
Net Proceeds from Issuance of Common Shares	287.6	0
Proceeds from first lien notes offering	0	503.5
Repurchase of debt	(301)	(225.9)
Borrowings under credit facilities	105	309.8
Repayment under credit facilities	(105)	(309.8)
Preferred stock dividends	0	(38.4)
Other financing activities	(19.3)	(38.8)
Net cash provided (used) by financing activities	(186)	98.2
EFFECT OF EXCHANGE RATE CHANGES ON CASH	0.4	(2.2)
DECREASE IN CASH AND CASH EQUIVALENTS	(153)	(20.7)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	285.2	290.9
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 132.2	$ 270.2

BASIS OF PRESENTATION AND SIGNI

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	NOTE 1 - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with SEC rules and regulations and, in the opinion of management, include all adjustments (consisting of normal recurring adjustments) necessary to present fairly, the financial position, results of operations, comprehensive income (loss) and cash flows for the periods presented. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Management bases its estimates on various assumptions and historical experience, which are believed to be reasonable; however, due to the inherent nature of estimates, actual results may differ significantly due to changed conditions or assumptions. The results of operations for the three and nine months ended September 30, 2016 are not necessarily indicative of results to be expected for the year ending December 31, 2016 or any other future period. These unaudited condensed consolidated financial statements should be read in conjunction with the financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2015 . As more fully described in the Form 10-K for the year ended December 31, 2015 , we announced in January 2015, that the Bloom Lake Group commenced CCAA proceedings (the "Bloom Filing") with the Quebec Superior Court (Commercial Division) in Montreal (the "Montreal Court"). Effective January 27, 2015, following the Bloom Filing, we deconsolidated the Bloom Lake Group and certain other wholly-owned subsidiaries comprising substantially all of our Canadian operations. Additionally, on May 20, 2015, the Wabush Group commenced CCAA proceedings (the "Wabush Filing") in the Montreal Court, which resulted in the deconsolidation of the remaining Wabush Group entities that were not previously deconsolidated. Financial results prior to the respective deconsolidations of the Bloom Lake and Wabush Groups and subsequent expenses directly associated with the Canadian Entities are included in our financial statements and classified within discontinued operations. Also, for the majority of 2015, we operated two metallurgical coal operations in Alabama and West Virginia. In December 2015, we completed the sale of these two metallurgical coal operations, which marked our exit from the coal business. As of March 31, 2015, management determined that our North American Coal operating segment met the criteria to be classified as held for sale under ASC 205, Presentation of Financial Statements . As such, all presented North American Coal operating segment results are included and classified within discontinued operations in our financial statements. Refer to NOTE 14 - DISCONTINUED OPERATIONS for further discussion of the Eastern Canadian Iron Ore and North American Coal segment's discontinued operations. We report our results from continuing operations in two reportable segments: U.S. Iron Ore and Asia Pacific Iron Ore. Basis of Consolidation The unaudited condensed consolidated financial statements include our accounts and the accounts of our wholly-owned and majority-owned subsidiaries, including the following operations as of September 30, 2016 : Name Location Ownership Interest Operation Status of Operations Northshore Minnesota 100.0% Iron Ore Active United Taconite Minnesota 100.0% Iron Ore Active Tilden Michigan 85.0% Iron Ore Active Empire Michigan 79.0% Iron Ore Idle Koolyanobbing Western Australia 100.0% Iron Ore Active Intercompany transactions and balances are eliminated upon consolidation. Equity Method Investments Our 23 percent ownership interest in Hibbing is recorded as an equity method investment. As of September 30, 2016 and December 31, 2015 , our investment in Hibbing was $1.9 million and $2.4 million , respectively, classified as Other liabilities in the Statements of Unaudited Condensed Consolidated Financial Position . Foreign Currency Our financial statements are prepared with the U.S. dollar as the reporting currency. The functional currency of our Australian subsidiaries is the Australian dollar. The functional currency of all other international subsidiaries is the U.S. dollar. The financial statements of international subsidiaries are translated into U.S. dollars using the exchange rate at each balance sheet date for assets and liabilities and a weighted average exchange rate for each period for revenues, expenses, gains and losses. Where the local currency is the functional currency, translation adjustments are recorded as Accumulated other comprehensive loss . Income taxes generally are not provided for foreign currency translation adjustments. To the extent that monetary assets and liabilities, inclusive of intercompany notes, are recorded in a currency other than the functional currency, these amounts are remeasured each reporting period, with the resulting gain or loss being recorded in the Statements of Unaudited Condensed Consolidated Operations . Transaction gains and losses resulting from remeasurement of short-term intercompany loans are included in Miscellaneous - net in the Statements of Unaudited Condensed Consolidated Operations . For the three and nine months ended September 30, 2016 , we incurred a net loss of $0.3 million and $1.2 million , respectively, from the impact of transaction gains and losses resulting from remeasurement. Of these amounts, for the three months ended September 30, 2016 , losses of $1.1 million and gains of $0.6 million and for the nine months ended September 30, 2016 , gains of $0.3 million and losses of $2.0 million resulted from remeasurement of cash and cash equivalents and remeasurement of certain obligations, respectively. For the three and nine months ended September 30, 2015 , net gains of $2.4 million and $15.2 million , respectively, related to the impact of transaction gains and losses resulting from remeasurement. Of these amounts, for the three months ended September 30, 2015 , gains of $0.1 million and $1.3 million , respectively, resulted from remeasurement of short-term intercompany loans and cash and cash equivalents. Additionally, of these amounts for the nine months ended September 30, 2015 , gains of $11.1 million and $2.0 million resulted from remeasurement of short-term intercompany loans and cash and cash equivalents, respectively. Significant Accounting Policies A detailed description of our significant accounting policies can be found in the audited financial statements for the fiscal year ended December 31, 2015 included in our Annual Report on Form 10-K filed with the SEC. There have been no material changes in our significant accounting policies and estimates from those disclosed therein. Recent Accounting Pronouncements Issued and Not Effective In February 2016, the FASB issued ASU No. 2016-02, Leases. The new standard requires recognition of lease assets and lease liabilities for leases previously classified as operating leases. The guidance is effective for fiscal years beginning after December 15, 2018. We are currently reviewing the guidance and assessing the potential impact on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Stock Compensation - Improvements to Employee Share-Based Payment Accounting. The new standard is intended to simplify several aspects of the accounting for share-based payment award transactions. The guidance is effective for fiscal years beginning after December 15, 2016, and early adoption is permitted. We are currently reviewing the guidance and assessing the potential impact on our consolidated financial statements. Issued and Adopted In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments. The new standard addresses eight specific changes to how cash receipts and cash payments are presented and classified in the statement of cash flows. The guidance is effective for interim and annual reporting periods beginning after December 15, 2017, and early adoption is permitted. We have adopted the guidance for the period ended September 30, 2016 and have applied this amended accounting guidance to the Statements of Unaudited Condensed Consolidated Cash Flows for all periods presented. The adoption of ASU 2016-15 did not have an impact on prior results reported in the Statements of Unaudited Condensed Consolidated Cash Flows .

SEGMENT REPORTING

SEGMENT REPORTING	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
SEGMENT REPORTING	NOTE 2 - SEGMENT REPORTING Our continuing operations are organized and managed according to geographic location: U.S. Iron Ore and Asia Pacific Iron Ore. Our U.S. Iron Ore segment is a major supplier of iron ore pellets to the North American steel industry from our mines and pellet plants located in Michigan and Minnesota. The Asia Pacific Iron Ore segment is located in Western Australia and provides iron ore to the seaborne market for Asian steel producers. There were no intersegment revenues in the first nine months of 2016 or 2015. We have historically evaluated segment performance based on sales margin, defined as revenues less cost of goods sold, and operating expenses identifiable to each segment. Additionally, we evaluate segment performance based on the key indicators of EBITDA, defined as net income (loss) before interest, income taxes, depreciation, depletion and amortization, and Adjusted EBITDA, defined as EBITDA excluding certain items such as impacts of impairment of other long-lived assets, discontinued operations, extinguishment/restructuring of debt, severance and contractor termination costs, foreign currency remeasurement, and intersegment corporate allocations of SG&A costs. These measures allow management and investors to focus on our ability to service our debt, as well as, illustrate how the business and each operating segment is performing. Additionally, EBITDA and Adjusted EBITDA assist management and investors in their analysis and forecasting as these measures approximate the cash flows associated with operational earnings. The following tables present a summary of our reportable segments for the three and nine months ended September 30, 2016 and 2015 , including a reconciliation of segment sales margin to Income (Loss) from Continuing Operations Before Income Taxes and a reconciliation of Net Income (Loss) to EBITDA and Adjusted EBITDA: (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Revenues from product sales and services: U.S. Iron Ore $ 428.3 77 % $ 471.0 79 % $ 975.5 72 % $ 1,152.5 75 % Asia Pacific Iron Ore 125.0 23 % 122.2 21 % 379.5 28 % 384.8 25 % Total revenues from product sales and services $ 553.3 100 % $ 593.2 100 % $ 1,355.0 100 % $ 1,537.3 100 % Sales margin: U.S. Iron Ore $ 66.5 $ 48.7 $ 149.7 $ 177.7 Asia Pacific Iron Ore 18.9 6.4 58.1 15.5 Sales margin 85.4 55.1 207.8 193.2 Other operating expense (50.7 ) (25.9 ) (98.7 ) (66.4 ) Other income (expense) (66.9 ) 17.4 8.3 221.7 Income (loss) from continuing operations before income taxes $ (32.2 ) $ 46.6 $ 117.4 $ 348.5 (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Net Income (Loss) $ (27.8 ) $ 6.0 $ 118.5 $ (690.5 ) Less: Interest expense, net (48.7 ) (62.3 ) (156.2 ) (170.7 ) Income tax benefit (expense) 7.1 4.8 1.7 (167.3 ) Depreciation, depletion and amortization (26.8 ) (35.6 ) (88.9 ) (99.1 ) EBITDA $ 40.6 $ 99.1 $ 361.9 $ (253.4 ) Less: Impairment of other long-lived assets $ — $ — $ — $ (3.3 ) Impact of discontinued operations (2.7 ) (44.8 ) (0.6 ) (865.9 ) Gain (loss) on extinguishment/restructuring of debt (18.3 ) 79.2 164.1 392.9 Severance and contractor termination costs — 2.2 (0.1 ) (9.3 ) Foreign exchange remeasurement (0.3 ) 2.4 (1.2 ) 15.2 Adjusted EBITDA $ 61.9 $ 60.1 $ 199.7 $ 217.0 EBITDA: U.S. Iron Ore $ 61.1 $ 69.2 $ 196.6 $ 239.6 Asia Pacific Iron Ore 21.2 11.1 69.6 38.7 Other (41.7 ) 18.8 95.7 (531.7 ) Total EBITDA $ 40.6 $ 99.1 $ 361.9 $ (253.4 ) Adjusted EBITDA: U.S. Iron Ore $ 65.3 $ 72.3 $ 208.6 $ 254.6 Asia Pacific Iron Ore 23.7 9.7 73.2 32.8 Other (27.1 ) (21.9 ) (82.1 ) (70.4 ) Total Adjusted EBITDA $ 61.9 $ 60.1 $ 199.7 $ 217.0 (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Depreciation, depletion and amortization: U.S. Iron Ore $ 18.8 $ 27.9 $ 65.1 $ 71.6 Asia Pacific Iron Ore 6.3 6.1 19.2 19.1 Other 1.7 1.6 4.6 5.2 Total depreciation, depletion and amortization $ 26.8 $ 35.6 $ 88.9 $ 95.9 Capital additions 1 : U.S. Iron Ore $ 25.8 $ 15.0 $ 39.5 $ 35.8 Asia Pacific Iron Ore 0.2 0.3 0.2 4.8 Other 0.4 2.4 4.8 6.0 Total capital additions $ 26.4 $ 17.7 $ 44.5 $ 46.6 1 Includes capital lease additions and non-cash accruals. Refer to NOTE 17 - CASH FLOW INFORMATION . A summary of assets by segment is as follows: (In Millions) September 30, December 31, Assets: U.S. Iron Ore $ 1,429.0 $ 1,476.4 Asia Pacific Iron Ore 137.7 202.5 Total segment assets 1,566.7 1,678.9 Corporate 206.2 441.7 Assets of Discontinued Operations — 14.9 Total assets $ 1,772.9 $ 2,135.5

INVENTORIES

INVENTORIES	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Inventories	NOTE 3 - INVENTORIES The following table presents the detail of our Inventories in the Statements of Unaudited Condensed Consolidated Financial Position as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, 2016 December 31, 2015 Segment Finished Goods Work-in Process Total Inventory Finished Goods Work-in Process Total Inventory U.S. Iron Ore $ 248.8 $ 20.4 $ 269.2 $ 252.3 $ 11.7 $ 264.0 Asia Pacific Iron Ore 17.3 30.8 48.1 20.8 44.8 65.6 Total $ 266.1 $ 51.2 $ 317.3 $ 273.1 $ 56.5 $ 329.6

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	NOTE 4 - PROPERTY, PLANT AND EQUIPMENT The following table indicates the value of each of the major classes of our consolidated depreciable assets as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, December 31, Land rights and mineral rights $ 500.5 $ 500.5 Office and information technology 63.6 71.0 Buildings 61.1 60.4 Mining equipment 598.7 594.0 Processing equipment 541.2 516.8 Electric power facilities 49.6 46.4 Land improvements 24.8 24.8 Asset retirement obligation 18.3 87.9 Other 28.4 28.2 Construction in-progress 37.9 40.3 1,924.1 1,970.3 Allowance for depreciation and depletion (934.0 ) (911.3 ) $ 990.1 $ 1,059.0 We recorded depreciation and depletion expense of $25.6 million and $85.1 million in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 , respectively. This compares with depreciation and depletion expense of $ 34.6 million and $ 92.8 million for the three and nine months ended September 30, 2015 , respectively.

DEBT AND CREDIT FACILITIES

DEBT AND CREDIT FACILITIES	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
DEBT AND CREDIT FACILITIES	NOTE 5 - DEBT AND CREDIT FACILITIES The following represents a summary of our long-term debt as of September 30, 2016 and December 31, 2015 : ($ in Millions) September 30, 2016 Debt Instrument Annual Effective Interest Rate Total Principal Amount Debt Issuance Costs Undiscounted Interest/(Unamortized Discounts) Total Debt $700 Million 4.875% 2021 Senior Notes 4.89% $ 325.7 $ (1.2 ) $ (0.2 ) $ 324.3 (1) $1.3 Billion Senior Notes: $500 Million 4.80% 2020 Senior Notes 4.83% 244.8 (0.7 ) (0.2 ) 243.9 (2) $800 Million 6.25% 2040 Senior Notes 6.34% 298.4 (2.5 ) (3.4 ) 292.5 (3) $400 Million 5.90% 2020 Senior Notes 5.98% 225.6 (0.7 ) (0.5 ) 224.4 (4) $500 Million 3.95% 2018 Senior Notes 6.15% — — — — (5) $540 Million 8.25% 2020 First Lien Notes 9.97% 540.0 (8.6 ) (27.4 ) 504.0 $218.5 Million 8.00% 2020 1.5 Lien Notes N/A 218.5 — 70.0 288.5 (6) $544.2 Million 7.75% 2020 Second Lien Notes 15.55% 430.1 (6.2 ) (90.1 ) 333.8 (7) $550 Million ABL Facility: ABL Facility N/A 550.0 N/A N/A — (8) Fair Value Adjustment to Interest Rate Hedge 2.0 Total debt $ 2,833.1 $ 2,213.4 Less: Current portion 17.5 Long-term debt $ 2,195.9 ($ in Millions) December 31, 2015 Debt Instrument Annual Effective Interest Rate Total Principal Amount Debt Issuance Costs Unamortized Discounts Total Debt $700 Million 4.875% 2021 Senior Notes 4.89% $ 412.5 $ (1.7 ) $ (0.2 ) $ 410.6 $1.3 Billion Senior Notes: $500 Million 4.80% 2020 Senior Notes 4.83% 306.7 (1.1 ) (0.4 ) 305.2 $800 Million 6.25% 2040 Senior Notes 6.34% 492.8 (4.3 ) (5.8 ) 482.7 $400 Million 5.90% 2020 Senior Notes 5.98% 290.8 (1.1 ) (0.8 ) 288.9 $500 Million 3.95% 2018 Senior Notes 6.30% 311.2 (0.9 ) (1.2 ) 309.1 $540 Million 8.25% 2020 First Lien Notes 9.97% 540.0 (10.5 ) (32.1 ) 497.4 $544.2 Million 7.75% 2020 Second Lien Notes 15.55% 544.2 (9.5 ) (131.5 ) 403.2 $550 Million ABL Facility: ABL Facility N/A 550.0 N/A N/A — (9) Fair Value Adjustment to Interest Rate Hedge 2.3 Total debt $ 3,448.2 $ 2,699.4 (1) On March 2, 2016, we exchanged as part of an exchange offer $76.3 million of the 4.875 percent senior notes for $30.5 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $41.5 million , including undiscounted interest payments as of the transaction date. Additionally, during the third quarter of 2016 we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction. (2) On March 2, 2016, we exchanged as part of an exchange offer $44.7 million of the 4.80 percent senior notes for $17.9 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $24.4 million , including undiscounted interest payments as of the transaction date. Additionally, during the second and third quarters of 2016 we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction. (3) On March 2, 2016, we exchanged as part of an exchange offer $194.4 million of the 6.25 percent senior notes for $75.8 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $103.0 million , including undiscounted interest payments as of the transaction date. (4) On March 2, 2016, we exchanged as part of an exchange offer $65.1 million of the 5.90 percent senior notes for $26.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $35.4 million , including undiscounted interest payments as of the transaction date. (5) See the section entitled " $500 million 3.95 percent 2018 Senior Notes - Full Redemption " below for further discussion related to this instrument. On March 2, 2016, we exchanged as part of an exchange offer $17.6 million of the 3.95 percent senior notes for $11.4 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $15.5 million , including undiscounted interest payments as of the transaction date. Additionally, during the first quarter of 2016, we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction. (6) See the section entitled " $218.5 million 8.00 percent 2020 Senior Secured 1.5 Lien Notes - 2016 Exchange Offers" below for further discussion related to this instrument. As of September 30, 2016 , $17.5 million of the undiscounted interest is recorded as current and classified as Other current liabilities in the Statements of Unaudited Condensed Consolidated Financial Position. (7) On March 2, 2016, we exchanged as part of an exchange offer $114.1 million of the 7.75 percent senior notes for $57.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $77.5 million , including undiscounted interest payments as of the transaction date. (8) As of September 30, 2016 , no loans were drawn under the ABL Facility and we had total availability of $355.7 million as a result of borrowing base limitations. As of September 30, 2016 , the principal amount of letter of credit obligations totaled $108.8 million , thereby further reducing available borrowing capacity on our ABL Facility to $246.9 million . (9) As of December 31, 2015 , no loans were drawn under the ABL Facility and we had total availability of $366.0 million as a result of borrowing base limitations. As of December 31, 2015 , the principal amount of letter of credit obligations totaled $186.3 million and commodity hedge obligations totaled $0.5 million , thereby further reducing available borrowing capacity on our ABL Facility to $179.2 million . $500 million 3.95 percent 2018 Senior Notes - Full Redemption On September 16, 2016, we redeemed in whole $283.6 million aggregate principal of the outstanding 3.95 percent senior notes due 2018 at a total redemption price of $301.0 million . As a result, we recorded a $19.9 million pre-tax loss on full retirement of long-term debt in the third quarter of 2016, which consisted of debt redemption premiums of $17.4 million and expenses of $2.5 million related to the write-off of unamortized debt issuance costs, unamortized bond discount and deferred losses on interest rate swaps. The loss was recorded against the Gain (Loss) on extinguishment/restructuring of debt in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 . $218.5 million 8.00 percent 2020 Senior Secured 1.5 Lien Notes - 2016 Exchange Offers On March 2, 2016, we entered into an indenture among the Company, the guarantors party thereto and U.S. Bank National Association, as trustee and notes collateral agent, relating to our issuance of $218.5 million aggregate principal amount of 8.00 percent 1.5 Lien Senior Secured Notes due 2020 (the “1.5 Lien Notes”). The 1.5 Lien Notes were issued on March 2, 2016 in exchange offers for certain of our existing senior notes. The 1.5 Lien Notes bear interest at a rate of 8.00 percent per annum. Interest on the 1.5 Lien Notes is payable semi-annually in arrears on March 31 and September 30 of each year, commencing on September 30, 2016. The 1.5 Lien Notes mature on September 30, 2020 and are secured senior obligations of the Company. The 1.5 Lien Notes are jointly and severally and fully and unconditionally guaranteed on a senior secured basis by substantially all of our material U.S. subsidiaries and are secured (subject in each case to certain exceptions and permitted liens) on (i) a junior first-priority basis by substantially all of our U.S. assets, other than the ABL collateral (the "Notes Collateral"), which secures the 8.25 percent senior first lien notes due 2020 (the "First Lien Notes") obligations on a senior first-priority basis, the 7.75 percent senior second lien notes due 2020 (the "Second Lien Notes") obligations on a second-priority basis and the ABL Facility obligations on a third-priority basis, and (ii) a junior second-priority basis by our ABL collateral, which secures our ABL obligations on a first-priority basis, the First Lien Notes obligations on a senior second-priority basis and the Second Lien Notes obligations on a third-priority basis. The terms of the 1.5 Lien Notes are governed by the 1.5 Lien Notes indenture. The 1.5 Lien Notes indenture contains customary covenants that, among other things, limit our ability to incur certain secured indebtedness, create liens on principal property and the capital stock or debt of a subsidiary that owns a principal property, use proceeds of dispositions of collateral, enter into certain sale and leaseback transactions, merge or consolidate with another company and transfer or sell all or substantially all of our assets. Upon the occurrence of a “change of control triggering event,” as defined in the 1.5 Lien Notes indenture, we are required to offer to repurchase the 1.5 Lien Notes at 101 percent of the aggregate principal amount thereof, plus any accrued and unpaid interest, if any, to, but excluding, the repurchase date. We may redeem any of the 1.5 Lien Notes beginning on September 30, 2017. The initial redemption price is 104 percent of their principal amount, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. The redemption price will decline after September 30, 2017 and will be 100 percent of its principal amount, plus accrued interest, beginning on September 30, 2019. We may also redeem some or all of the 1.5 Lien Notes at any time and from time to time prior to September 30, 2017 at a price equal to 100 percent of the principal amount thereof plus a “make-whole” premium, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. In addition, at any time and from time to time on or prior to September 30, 2017, we may redeem in the aggregate up to 35 percent of the original aggregate principal amount of the 1.5 Lien Notes (calculated after giving effect to any issuance of additional 1.5 Lien Notes) with the net cash proceeds from certain equity offerings, at a redemption price of 108 percent , plus accrued and unpaid interest, if any, to, but excluding, the redemption date, so long as at least 65 percent of the original aggregate principal amount of the 1.5 Lien Notes (calculated after giving effect to any issuance of additional 1.5 Lien Notes) issued under the 1.5 Lien Notes indenture remain outstanding after each such redemption. The 1.5 Lien Notes indenture contains customary events of default, including failure to make required payments, failure to comply with certain agreements or covenants, failure to pay or acceleration of certain other indebtedness, certain events of bankruptcy and insolvency and failure to pay certain judgments. An event of default under the 1.5 Lien Notes indenture will allow either the trustee or the holders of at least 25 percent in aggregate principal amount of the then-outstanding 1.5 Lien Notes issued under the 1.5 Lien Notes indenture to accelerate, or in certain cases, will automatically cause the acceleration of, the amounts due under the 1.5 Lien Notes. We accounted for the 1.5 Lien Notes exchange as a TDR. For an exchange classified as TDR, if the future undiscounted cash flows of the newly issued debt are less than the net carrying value of the original debt, the carrying value of the newly issued debt is adjusted to the future undiscounted cash flow amount, a gain is recorded for the difference and no future interest expense is recorded. All future interest payments on the newly issued debt reduce the carrying value. Accordingly, we recognized a gain of $174.3 million in the Gain (loss) on extinguishment/restructuring of debt in the Statements of Unaudited Condensed Consolidated Operations for the nine months ended September 30, 2016 . As a result, our reported interest expense will be less than the contractual interest payments throughout the term of the 1.5 Lien Notes. Debt issuance costs incurred of $5.2 million related to the notes exchange were expensed and were included in the Gain (loss) on extinguishment/restructuring of debt in the Statements of Unaudited Condensed Consolidated Operations for the nine months ended September 30, 2016 . Letters of Credit We issued standby letters of credit with certain financial institutions in order to support business obligations including, but not limited to, workers compensation and environmental obligations. As of September 30, 2016 and December 31, 2015 , these letter of credit obligations totaled $108.8 million and $186.3 million , respectively. Debt Maturities The following represents a summary of our maturities of debt instruments, excluding borrowings on the ABL Facility, based on the principal amounts outstanding at September 30, 2016 : (In Millions) Maturities of Debt 2016 (October 1 - December 31) $ — 2017 — 2018 — 2019 — 2020 1,659.0 2021 325.7 2022 and thereafter 298.4 Total maturities of debt $ 2,283.1

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	NOTE 6 - FAIR VALUE MEASUREMENTS We have various financial instruments that require fair value measurements classified as Level 1, Level 2 and Level 3 of the fair value hierarchy. The following discussion represents the assets and liabilities measured at fair value at September 30, 2016 and December 31, 2015 . There were no Level 1 financial assets as of September 30, 2016 . Financial assets classified in Level 1 as of December 31, 2015 , include money market funds of $30.0 million . The valuation of these instruments is based upon unadjusted quoted prices for identical assets in active markets. The derivative financial assets classified within Level 3 at September 30, 2016 and December 31, 2015 primarily relate to a freestanding derivative instrument related to certain supply agreements with one of our U.S. Iron Ore customers. The agreements include provisions for supplemental revenue or refunds based on the customer’s annual steel pricing at the time the product is consumed in the customer’s blast furnaces. We account for this provision as a derivative instrument at the time of sale and adjust this provision to fair value as an adjustment to Product revenues each reporting period until the product is consumed and the amounts are settled. The fair value of the instrument is determined using a market approach based on an estimate of the annual realized price of hot-rolled coil at the steelmaker’s facilities, and takes into consideration current market conditions and nonperformance risk. The Level 3 derivative assets and liabilities also consisted of derivatives related to certain provisional pricing arrangements with our U.S. Iron Ore and Asia Pacific Iron Ore customers at September 30, 2016 and December 31, 2015 . These provisional pricing arrangements specify provisional price calculations, where the pricing mechanisms generally are based on market pricing, with the final revenue rate to be based on market inputs at a specified point in time in the future, per the terms of the supply agreements. The difference between the estimated final revenue at the date of sale and the estimated final revenue rate is characterized as a derivative and is required to be accounted for separately once the revenue has been recognized. The derivative instrument is adjusted to fair value through Product revenues each reporting period based upon current market data and forward-looking estimates provided by management until the final revenue rate is determined. The following table illustrates information about quantitative inputs and assumptions for the derivative assets and derivative liabilities categorized in Level 3 of the fair value hierarchy: Qualitative/Quantitative Information About Level 3 Fair Value Measurements (In Millions) Fair Value at September 30, 2016 Balance Sheet Location Valuation Technique Unobservable Input Range or Point Estimate per dry metric ton (Weighted Average) Provisional pricing arrangements $ 0.4 Other current assets Market Approach Management's Estimate of 62% Fe $56 $ 2.7 Other current liabilities Customer supply agreement $ 28.0 Other current assets Market Approach Hot-Rolled Coil Estimate $430 - $530 ($470) The significant unobservable input used in the fair value measurement of our provisional pricing arrangements is management’s estimate of 62 percent Fe fines spot price based upon current market data, including historical seasonality and forward-looking estimates determined by management. Significant increases or decreases in this input would result in a significantly higher or lower fair value measurement, respectively. The significant unobservable input used in the fair value measurement of our customer supply agreement is the future hot-rolled coil price that is estimated based on projections provided by the customer, current market data, analysts' projections and forward-looking estimates determined by management. Significant increases or decreases in this input would result in a significantly higher or lower fair value measurement, respectively. We recognize any transfers between levels as of the beginning of the reporting period. There were no transfers between Level 1 and Level 2 of the fair value hierarchy during the three and nine months ended September 30, 2016 or 2015 . The following tables represent a reconciliation of the changes in fair value of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2016 and 2015 . (In Millions) Derivative Assets (Level 3) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Beginning balance $ 25.8 $ 7.7 $ 7.8 $ 63.2 Total gains (losses) Included in earnings 14.6 15.0 62.6 28.1 Settlements (12.0 ) (12.3 ) (42.0 ) (80.9 ) Transfers into Level 3 — — — — Transfers out of Level 3 — — — — Ending balance - September 30 $ 28.4 $ 10.4 $ 28.4 $ 10.4 Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date $ 8.2 $ 12.2 $ 24.7 $ 22.7 (In Millions) Derivative Liabilities (Level 3) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Beginning balance $ (2.6 ) $ (8.0 ) $ (3.4 ) $ (9.5 ) Total gains (losses) Included in earnings (2.9 ) (13.7 ) (12.8 ) (45.4 ) Settlements 2.8 20.9 13.5 54.1 Transfers into Level 3 — — — — Transfers out of Level 3 — — — — Ending balance - September 30 $ (2.7 ) $ (0.8 ) $ (2.7 ) $ (0.8 ) Total losses for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date $ (2.7 ) $ (0.5 ) $ (2.7 ) $ (0.8 ) Gains and losses included in earnings are reported in Product revenues in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 and 2015 . The carrying amount for certain financial instruments (e.g., Accounts receivable, net , Accounts payable and Accrued expenses ) approximates fair value and, therefore, has been excluded from the table below. A summary of the carrying amount and fair value of other financial instruments at September 30, 2016 and December 31, 2015 were as follows: (In Millions) September 30, 2016 December 31, 2015 Classification Carrying Value Fair Value Carrying Value Fair Value Long-term debt: Senior Notes—$700 million Level 1 $ 324.3 $ 260.6 $ 410.6 $ 69.4 Senior Notes—$1.3 billion Level 1 536.4 400.7 787.9 137.4 Senior Notes—$400 million Level 1 224.4 194.9 288.9 52.8 Senior Notes—$500 million Level 1 — — 309.1 87.1 Senior First Lien Notes —$540 million Level 1 504.0 573.2 497.4 414.5 Senior 1.5 Lien Notes —$218.5 million Level 2 288.5 210.9 — — Senior Second Lien Notes —$544.2 million Level 1 333.8 402.8 403.2 134.7 ABL Facility Level 2 — — — — Fair value adjustment to interest rate hedge Level 2 2.0 2.0 2.3 2.3 Total long-term debt $ 2,213.4 $ 2,045.1 $ 2,699.4 $ 898.2 The fair value of long-term debt was determined using quoted market prices based upon current borrowing rates. The ABL Facility is variable rate interest and approximates fair value. See NOTE 5 - DEBT AND CREDIT FACILITIES for further information.

PENSIONS AND OTHER POSTRETIREME

PENSIONS AND OTHER POSTRETIREMENT BENEFITS	9 Months Ended
	Sep. 30, 2016
Postemployment Benefits [Abstract]
PENSIONS AND OTHER POSTRETIREMENT BENEFITS	NOTE 7 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS We offer defined benefit pension plans, defined contribution pension plans and OPEB plans, primarily consisting of retiree healthcare benefits, to most employees in the United States as part of a total compensation and benefits program. We do not have employee retirement benefit obligations at our Asia Pacific Iron Ore operations. The defined benefit pension plans largely are noncontributory and benefits generally are based on employees’ years of service and average earnings for a defined period prior to retirement or a minimum formula. Historically, we selected a single-weighted discount rate to be used for all pension and OPEB plans based on the 10th to 90th percentile results. Beginning January 1, 2016, we elected to select a separate discount rate for each plan, based on 40th to 90th percentile results. The discount rates are determined by matching the projected cash flows used to determine the projected benefit obligation and accumulated postretirement benefit obligation to a projected yield curve of 688 Aa graded bonds. These bonds are either noncallable or callable with make-whole provisions. We made this change in order to more precisely measure our service and interest costs, by improving the correlation between projected benefit cash flows and the corresponding spot yield curve rates. As this change is treated as a change in estimate, the impact is reflected in the first nine months of the current fiscal year and prospectively, and historical measurements of service and interest cost were not affected. This change in estimate is anticipated to reduce our current year annual net periodic benefit expense by approximately $8.2 million for our pension plans and by approximately $1.8 million for our OPEB plans. Accordingly, for the three and nine months ended September 30, 2016 , total service cost and interest cost for the defined benefit pension plans were $12.0 million and $35.9 million , respectively, a reduction of $1.9 million and $6.1 million , respectively, as a result of implementing the new approach. For the three and nine months ended September 30, 2016 , total service cost and interest cost for the OPEB plans were $2.7 million and $8.1 million , respectively, a reduction of $0.2 million and $1.4 million , respectively, as a result of implementing the new approach. The following are the components of defined benefit pension and OPEB expense for the three and nine months ended September 30, 2016 and 2015 : Defined Benefit Pension Expense (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Service cost $ 4.2 $ 3.1 $ 13.2 $ 15.7 Interest cost 7.8 9.0 22.7 27.9 Expected return on plan assets (13.6 ) (14.5 ) (41.0 ) (44.4 ) Amortization: Prior service costs 0.5 0.5 1.6 1.7 Net actuarial loss 5.4 4.5 15.9 15.3 Curtailments/settlements — $ (0.1 ) — 0.2 Net periodic benefit cost to continuing operations $ 4.3 $ 2.5 $ 12.4 $ 16.4 Other Postretirement Benefits Expense (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Service cost $ 0.4 $ (1.6 ) $ 1.3 $ 1.4 Interest cost 2.3 2.1 6.8 8.6 Expected return on plan assets (4.3 ) (4.5 ) (12.8 ) (13.7 ) Amortization: Prior service credits (0.9 ) 0.6 (2.8 ) (1.2 ) Net actuarial loss 1.7 1.1 4.5 4.2 Net periodic benefit credit to continuing operations $ (0.8 ) $ (2.3 ) $ (3.0 ) $ (0.7 ) We made pension contributions of $0.5 million and $0.7 million for the three and nine months ended September 30, 2016 , respectively, compared to pension contributions of $23.9 million and $34.1 million for the three and nine months ended September 30, 2015 , respectively. OPEB contributions are typically made on an annual basis in the first quarter of each year, but due to plan funding requirements being met, no OPEB contributions were required or made for the three and nine months ended September 30, 2016 and September 30, 2015 .

STOCK COMPENSATION PLANS

STOCK COMPENSATION PLANS	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation Plans	NOTE 8 - STOCK COMPENSATION PLANS Employees’ Plans During the first quarter of 2016, the Compensation and Organization Committee of the Board of Directors approved grants under the 2015 Equity Plan of 3.4 million restricted share units to certain officers and employees with a grant date of February 23, 2016. The restricted share units granted under this award are subject to continued employment through the vesting date of December 31, 2018.

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 9 - INCOME TAXES Our 2016 estimated annual effective tax rate before discrete items is approximately 0.4 percent . The annual effective tax rate differs from the U.S. statutory rate of 35 percent primarily due to deductions for percentage depletion in excess of cost depletion related to U.S. operations, a deduction for worthless stock and the placement of valuation allowance from operations in the current year. The 2015 estimated annual effective tax rate before discrete items at September 30, 2015 was 2.1 percent . For the three and nine months ended September 30, 2016 , we recorded discrete items that resulted in an income tax benefit of $2.9 million and $2.2 million , respectively. These items relate primarily to prior year adjustments due to a change in estimate of the 2015 net operating loss and corresponding reversal of valuation allowance and quarterly interest accrued on reserves for uncertain tax positions. For the three and nine months ended September 30, 2015 , there were discrete items that resulted in an income tax benefit of $4.5 million and income tax expense of $162.6 million , respectively. These items were related primarily to the recording of valuation allowances against existing deferred tax assets as a result of the determination that these would no longer be realizable.

LEASE OBLIGATIONS

LEASE OBLIGATIONS	9 Months Ended
	Sep. 30, 2016
Leases [Abstract]
LEASE OBLIGATIONS	NOTE 10 - LEASE OBLIGATIONS We lease certain mining, production and other equipment under operating and capital leases. The capital leases are for varying lengths, generally at market interest rates and contain purchase and/or renewal options at the end of the terms. Our operating lease expense was $2.2 million and $6.8 million for the three and nine months ended September 30, 2016 , respectively, compared with $3.2 million and $9.5 million , respectively, for the same periods in 2015 . Future minimum payments under capital leases and non-cancellable operating leases at September 30, 2016 are as follows: (In Millions) Capital Leases Operating Leases 2016 (October 1 - December 31) $ 6.4 $ 2.3 2017 23.4 8.9 2018 18.9 7.6 2019 10.5 4.9 2020 9.4 4.9 2021 and thereafter 9.4 5.0 Total minimum lease payments $ 78.0 $ 33.6 Amounts representing interest 14.2 Present value of net minimum lease payments $ 63.8 (1) (1) The total is comprised of $18.3 million and $45.5 million classified as Other current liabilities and Other liabilities , respectively, in the Statements of Unaudited Condensed Consolidated Financial Position at September 30, 2016 .

ENVIRONMENTAL AND MINE CLOSURE

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS	9 Months Ended
	Sep. 30, 2016
Environmental Remediation Obligations [Abstract]
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS	NOTE 11 - ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS We had environmental and mine closure liabilities of $222.8 million and $234.0 million at September 30, 2016 and December 31, 2015 , respectively. The following is a summary of the obligations as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, December 31, Environmental $ 3.0 $ 3.6 Mine closure LTVSMC 25.0 24.1 Operating mines: U.S. Iron Ore 176.8 189.9 Asia Pacific Iron Ore 18.0 16.4 Total mine closure 219.8 230.4 Total environmental and mine closure obligations 222.8 234.0 Less current portion 2.6 2.8 Long term environmental and mine closure obligations $ 220.2 $ 231.2 Mine Closure The accrued closure obligation for our active mining operations provides for contractual and legal obligations associated with the eventual closure of the mining operations. The accretion of the liability and amortization of the related asset is recognized over the estimated mine lives for each location. The following represents a rollforward of our asset retirement obligation liability related to our active mining locations for the nine months ended September 30, 2016 and for the year ended December 31, 2015 : (In Millions) September 30, December 31, 2015 Asset retirement obligation at beginning of period $ 206.3 $ 142.4 Accretion expense 8.4 6.5 Exchange rate changes 0.9 (1.1 ) Revision in estimated cash flows (20.8 ) 58.5 Asset retirement obligation at end of period $ 194.8 $ 206.3 The revisions in the estimated cash flows recorded during the nine months ended September 30, 2016 relate primarily to revisions of the timing of the estimated cash flows related to one of our U.S. mines. For the year ended December 31, 2015 , the revisions in estimated cash flows recorded during the year related primarily to revisions in the timing of the estimated cash flows and the technology associated with required storm water management systems expected to be implemented subsequent to the indefinite idling of the Empire mine.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES	NOTE 12 - GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES Goodwill The carrying amount of goodwill for the nine months ended September 30, 2016 and the year ended December 31, 2015 was $2.0 million and related to our U.S. Iron Ore operating segment. Other Intangible Assets and Liabilities The following table is a summary of intangible assets and liabilities as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, 2016 December 31, 2015 Classification Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Definite-lived intangible assets: Permits Other non-current assets $ 78.7 $ (23.8 ) $ 54.9 $ 78.4 $ (20.2 ) $ 58.2 Total intangible assets $ 78.7 $ (23.8 ) $ 54.9 $ 78.4 $ (20.2 ) $ 58.2 Below-market sales contracts Other current liabilities $ (23.1 ) $ 15.4 $ (7.7 ) $ (23.1 ) $ — $ (23.1 ) Below-market sales contracts Other liabilities (205.8 ) 205.8 — (205.8 ) 205.8 — Total below-market sales contracts $ (228.9 ) $ 221.2 $ (7.7 ) $ (228.9 ) $ 205.8 $ (23.1 ) Amortization expense relating to intangible assets was $1.2 million and $3.8 million for the three and nine months ended September 30, 2016 , respectively, and is recognized in Cost of goods sold and operating expenses in the Statements of Unaudited Condensed Consolidated Operations . Amortization expense relating to intangible assets was $0.9 million and $3.1 million , respectively, for the comparable periods in 2015. The estimated amortization expense relating to intangible assets for the remainder of this year and each of the five succeeding years is as follows: (In Millions) Amount Year Ending December 31, 2016 (remaining three months) $ 1.0 2017 4.2 2018 4.2 2019 2.5 2020 2.5 2021 2.5 Total $ 16.9 The below-market sales contract is classified as a liability and recognized over the term of the underlying contract, which expires December 31, 2016. For the three and nine months ended September 30, 2016 and September 30, 2015 , we recognized $7.7 million and $15.4 million , respectively, in Product revenues related to the below-market sales contract. The remaining $7.7 million is estimated to be recognized in Product revenues during the remainder of 2016.

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	NOTE 13 - DERIVATIVE INSTRUMENTS The following table presents the fair value of our derivative instruments and the classification of each in the Statements of Unaudited Condensed Consolidated Financial Position as of September 30, 2016 and December 31, 2015 : (In Millions) Derivative Assets Derivative Liabilities September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Customer supply agreement Other current assets 28.0 Other current assets 5.8 — — Provisional pricing arrangements Other current assets 0.4 Other current assets 2.0 Other current liabilities 2.7 Other current liabilities 3.4 Commodity contracts — — — Other current liabilities 0.6 Total derivatives not designated as hedging instruments under ASC 815 $ 28.4 $ 7.8 $ 2.7 $ 4.0 Derivatives Not Designated as Hedging Instruments Customer Supply Agreements Most of our U.S. Iron Ore long-term supply agreements are comprised of a base price with annual price adjustment factors. The base price is the primary component of the purchase price for each contract. The indexed price adjustment factors are integral to the iron ore supply contracts and vary based on the agreement, but typically include adjustments based upon changes in specified price indices, including those for industrial commodities, energy and cold rolled steel and changes in the Platts IODEX. The pricing adjustments generally operate in the same manner, with each factor typically comprising a portion of the price adjustment, although the weighting of each factor varies based upon the specific terms of each agreement. In most cases, these adjustment factors have not been finalized at the time our product is sold. In these cases, we historically have estimated the adjustment factors at each reporting period based upon the best third-party information available. The estimates are then adjusted to actual when the information has been finalized. The price adjustment factors have been evaluated to determine if they contain embedded derivatives. The price adjustment factors share the same economic characteristics and risks as the host contract and are integral to the host contract as inflation adjustments; accordingly, they have not been separately valued as derivative instruments. Certain of our term supply agreements contain price collars, which typically limit the percentage increase or decrease in prices for our products during any given year. A certain supply agreement with one U.S. Iron Ore customer provides for supplemental revenue or refunds to the customer based on the customer’s average annual steel pricing at the time the product is consumed in the customer’s blast furnace. The supplemental pricing is characterized as a freestanding derivative and is required to be accounted for separately once the product is shipped. The derivative instrument, which is finalized based on a future price, is adjusted to fair value as a revenue adjustment each reporting period until the pellets are consumed and the amounts are settled. We recognized a $7.1 million and $26.8 million net gain in Product revenues in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 , respectively, related to the supplemental payments. This compares with Product revenues of $11.6 million and $22.1 million for the comparable periods in 2015 . Other current assets , representing the fair value of the pricing factors, were $28.0 million and $5.8 million in the September 30, 2016 and December 31, 2015 Statements of Unaudited Condensed Consolidated Financial Position , respectively. Provisional Pricing Arrangements Certain of our U.S. Iron Ore and Asia Pacific Iron Ore customer supply agreements specify provisional price calculations, where the pricing mechanisms generally are based on market pricing, with the final revenue rate to be based on market inputs at a specified period in time in the future, per the terms of the supply agreements. U.S. Iron Ore sales revenue primarily is recognized when cash is received. For U.S. Iron Ore sales, the difference between the provisionally agreed-upon price and the estimated final revenue rate is characterized as a freestanding derivative and must be accounted for separately once the provisional revenue has been recognized. Asia Pacific Iron Ore sales revenue is initially recorded at the provisionally agreed-upon price with the pricing provision embedded in the receivable. The pricing provision is an embedded derivative that must be bifurcated and accounted for separately from the receivable. Subsequently, the derivative instruments for both U.S. Iron Ore and Asia Pacific Iron Ore are adjusted to fair value through Product revenues each reporting period based upon current market data and forward-looking estimates provided by management until the final revenue rate is determined. At September 30, 2016 and December 31, 2015 , we recorded $0.4 million with our U.S. Iron Ore customers and $2.0 million with our Asia Pacific Iron Ore customers, respectively, as Other current assets in the Statements of Unaudited Condensed Consolidated Financial Position related to our estimate of the final revenue rate. At September 30, 2016 and December 31, 2015 , we recorded $2.7 million with our Asia Pacific Iron Ore customers and $3.4 million with our U.S. Iron Ore and Asia Pacific Iron Ore customers, respectively, as Other current liabilities in the Statements of Unaudited Condensed Consolidated Financial Position related to our estimate of the final revenue rate. These amounts represent the difference between the provisional price agreed upon with our customers based on the supply agreement terms and our estimate of the final revenue rate based on the price calculations established in the supply agreements. As a result, we recognized a $4.5 million and $22.9 million net increase in Product revenues in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 , respectively, related to these arrangements. This compares with a net $7.6 million increase and a net $0.2 million decrease in Product revenues for the comparable periods in 2015. The following summarizes the effect of our derivatives that are not designated as hedging instruments in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 and 2015 : (In Millions) Derivatives Not Designated as Hedging Instruments Location of Gain (Loss) Recognized in Amount of Gain (Loss) Recognized in Income on Derivative Three Months Ended Nine Months Ended 2016 2015 2016 2015 Customer supply agreement Product revenues 7.1 11.6 26.8 22.1 Provisional pricing arrangements Product revenues 4.5 7.6 22.9 (0.2 ) Foreign exchange contracts Other non-operating income (expense) — (1.1 ) — (3.6 ) Commodity contracts Cost of goods sold and operating expenses — — — (3.4 ) Foreign exchange contracts Product revenues — (2.1 ) — (11.8 ) $ 11.6 $ 16.0 $ 49.7 $ 3.1 Refer to NOTE 6 - FAIR VALUE MEASUREMENTS for additional information.

DISCONTINUED OPERATIONS

DISCONTINUED OPERATIONS	9 Months Ended
	Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	NOTE 14 - DISCONTINUED OPERATIONS The information below sets forth selected financial information related to operating results of our businesses classified as discontinued operations which include our former North American Coal and Canadian operations. The chart below provides an asset group breakout for each financial statement line impacted by discontinued operations. (In Millions) Canadian Operations North American Coal Eastern Canadian Iron Ore Other Total Canadian Operations Total of Discontinued Operations Statements of Unaudited Condensed Consolidated Operations Loss from Discontinued Operations, net of tax QTD $ (1.8 ) $ (0.9 ) $ — $ (0.9 ) $ (2.7 ) Loss from Discontinued Operations, net of tax QTD $ (29.8 ) $ (14.1 ) $ — $ (14.1 ) $ (43.9 ) Income (Loss) from Discontinued Operations, net of tax YTD $ (3.8 ) $ 3.2 $ — $ 3.2 $ (0.6 ) Loss from Discontinued Operations, net of tax YTD $ (137.0 ) $ (731.9 ) $ (0.1 ) $ (732.0 ) $ (869.0 ) Statements of Unaudited Condensed Consolidated Financial Position Short-term assets of discontinued operations As of September 30, 2016 $ — $ — $ — $ — $ — Short-term liabilities of discontinued operations As of $ 5.5 $ — $ — $ — $ 5.5 Short-term assets of discontinued operations As of December 31, 2015 $ 14.9 $ — $ — $ — $ 14.9 Short-term liabilities of discontinued operations As of $ 6.9 $ — $ — $ — $ 6.9 Non-Cash Operating and Investing Activities Depreciation, depletion and amortization: YTD $ 3.2 $ — $ — $ — $ 3.2 Purchase of property, plant and equipment YTD $ 13.1 $ — $ — $ — $ 13.1 Impairment of other long-lived assets YTD $ 73.4 $ — $ — $ — $ 73.4 North American Coal Operations Loss on Discontinued Operations Our previously reported North American Coal operating segment results are classified as discontinued operations for all periods presented. The closing of the sale of our Oak Grove and Pinnacle mines on December 22, 2015, completed a strategic shift in our business. (In Millions) Three Months Ended September 30, Nine Months Ended Loss from Discontinued Operations 2016 2015 2016 2015 Revenues from product sales and services $ — $ 78.8 $ — $ 338.1 Cost of goods sold and operating expenses — (102.9 ) — (377.2 ) Sales margin — (24.1 ) — (39.1 ) Other operating expense (1.8 ) (7.4 ) (3.8 ) (25.7 ) Other expense — (0.4 ) — (1.4 ) Loss from discontinued operations before income taxes (1.8 ) (31.9 ) (3.8 ) (66.2 ) Impairment of long-lived assets — — — (73.4 ) Income tax benefit — 2.1 — 2.6 Loss from discontinued operations, net of tax $ (1.8 ) $ (29.8 ) $ (3.8 ) $ (137.0 ) Recorded Assets and Liabilities (In Millions) Assets and Liabilities of Discontinued Operations (1) September 30, December 31, Other current assets $ — $ 14.9 Total assets of discontinued operations $ — $ 14.9 Accrued liabilities $ 1.2 $ — Other current liabilities (1) 4.3 6.9 Total liabilities of discontinued operations $ 5.5 $ 6.9 (1) At September 30, 2016 and December 31, 2015, we had $4.0 million and $7.8 million, respectively, of contingent liabilities associated with our exit from the coal business recorded on our parent company. Income Taxes We recognized no tax benefit or expense for the three and nine months ended September 30, 2016 in Loss from Discontinued Operations, net of tax , related to our North American Coal investments. For the three and nine months ended September 30, 2015, we recognized a tax benefit of $2.1 million and $2.6 million , respectively, in Loss from Discontinued Operations, net of tax . This benefit was primarily the result of a loss on our North American Coal investments. Canadian Operations Status of CCAA Proceedings On March 8, 2016, certain of the Canadian Entities completed the sale of their port and rail assets located in Pointe-Noire, Quebec to Societe Ferroviaire et Portuaire de Pointe-Noire S.E.C., an affiliate of Investissement Quebec, for CAD $66.75 million in cash and the assumption of certain liabilities. On April 11, 2016, certain of the Canadian Entities completed the sale of the Bloom Lake Mine and Labrador Trough South mineral claims located in Quebec, as well as certain rail assets located in Newfoundland & Labrador, to Quebec Iron Ore Inc., an affiliate of Champion Iron Mines Limited, for CAD $10.5 million in cash and the assumption of certain liabilities. After payment of sale expenses and taxes and repayment of the DIP financing, the net proceeds from these and certain other divestitures by the Canadian Entities are currently being held by the Monitor, on behalf of the Canadian Entities, to fund the costs of the CCAA proceedings and for eventual distribution to creditors of the Canadian Entities pending further order of the Montreal Court. Gain (Loss) on Discontinued Operations Our decision in 2015 to exit Canada represented a strategic shift in our business. For this reason, our previously reported Eastern Canadian Iron Ore and Ferroalloys operating segment results for all periods prior to the respective 2015 deconsolidations as well as costs to exit are classified as discontinued operations. (In Millions) Three Months Ended Nine Months Ended September 30, Gain (Loss) from Discontinued Operations 2016 2015 2016 2015 Revenues from product sales and services $ — $ — $ — $ 11.3 Cost of goods sold and operating expenses — — — (11.1 ) Sales margin — — — 0.2 Other operating expense — — — (33.8 ) Other expense — — — (1.0 ) Loss from discontinued operations before income taxes — — — (34.6 ) Gain (loss) from deconsolidation (0.9 ) (13.4 ) 3.2 (697.4 ) Income tax expense — (0.7 ) — — Gain (loss) from discontinued operations, net of tax $ (0.9 ) $ (14.1 ) $ 3.2 $ (732.0 ) Canadian Entities loss from deconsolidation totaled $0.9 million and gain from deconsolidation totaled $3.2 million for the three and nine months ended September 30, 2016 , respectively, which included the following: (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Investment impairment on deconsolidation 1 $ (0.9 ) $ (13.9 ) $ 3.2 $ (494.3 ) Contingent liabilities — 0.5 — (203.1 ) Total gain (loss) from deconsolidation $ (0.9 ) $ (13.4 ) $ 3.2 $ (697.4 ) 1 Includes the adjustment to fair value of our remaining interest in the Canadian Entities. We have no gain or loss from deconsolidation attributable to contingent liabilities for the three and nine months ended September 30, 2016 compared to a gain of $0.5 million and a loss of $203.1 million for the three and nine months ended September 30, 2015, respectively. As a result of the deconsolidation we recorded accrued expenses for the estimated probable loss related to claims that may be asserted against us, primarily under guarantees of certain debt arrangements and leases for a loss on deconsolidation of $203.1 million , for the nine months ended September 30, 2015. Investments in the Canadian Entities Cliffs continues to indirectly own a majority of the interest in the Canadian Entities but has deconsolidated those entities because Cliffs no longer has a controlling interest as a result of the Bloom Filing and the Wabush Filing. At the respective date of deconsolidation, January 27, 2015 or May 20, 2015 and subsequently at each reporting period, we adjusted our investment in the Canadian Entities to fair value with a corresponding charge to Loss from Discontinued Operations, net of tax . As the estimated amount of the Canadian Entities' liabilities exceeded the estimated fair value of the assets available for distribution to its creditors, the fair value of Cliffs’ equity investment is approximately zero . Amounts Receivable from the Canadian Entities Prior to the deconsolidations, various Cliffs wholly-owned entities made loans to the Canadian Entities for the purpose of funding its operations and had accounts receivable generated in the ordinary course of business. The loans, corresponding interest and the accounts receivable were considered intercompany transactions and eliminated in our consolidated financial statements. Since the deconsolidations, the loans, associated interest and accounts receivable are considered related party transactions and have been recognized in our consolidated financial statements at their estimated fair value of $69.3 million and $72.9 million in the Statements of Unaudited Condensed Consolidated Financial Position at September 30, 2016 and December 31, 2015, respectively. Contingent Liabilities Certain liabilities consisting primarily of equipment loans and environmental obligations of the Canadian Entities were secured through corporate guarantees and standby letters of credit. As of September 30, 2016 , we have liabilities of $0.2 million and $37.9 million , respectively, in our consolidated results, classified as Guarantees and Other liabilities in the Statements of Unaudited Condensed Consolidated Financial Position . As of December 31, 2015, we had liabilities of $96.5 million and $35.9 million , respectively, in our consolidated results, classified as Guarantees and Other liabilities in the Statements of Unaudited Condensed Consolidated Financial Position . Contingencies The recorded expenses include an accrual for the estimated probable loss related to claims that may be asserted against us, primarily under guarantees of certain debt arrangements and leases. The beneficiaries of those guarantees may seek damages or other related relief as a result of our exit from Canada. Our probable loss estimate is based on the expectation that claims will be asserted against us and negotiated settlements will be reached, and not on any determination that it is probable we would be found liable were these claims to be litigated. Our estimates involve significant judgment and are based on currently available information, an assessment of the validity of certain claims and estimated payments by the Canadian Entities. We are not able to reasonably estimate a range of possible losses in excess of the accrual because there are significant factual and legal issues to be resolved. We believe that it is reasonably possible that future changes to our estimates of loss and the ultimate amount paid on these claims could be material to our results of operations in future periods. Any such losses would be reported in discontinued operations. Items Measured at Fair Value on a Non-Recurring Basis The following table presents information about the financial assets and liabilities that were measured on a fair value basis at September 30, 2016 for the Canadian Operations. The table also indicates the fair value hierarchy of the valuation techniques used to determine such fair value. (In Millions) September 30, 2016 Description Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Total Gains Assets: Loans to and accounts receivables from the Canadian Entities $ — $ — $ 69.3 $ 69.3 $ 3.2 Liabilities: Contingent liabilities $ — $ — $ 38.1 $ 38.1 $ — We determined the fair value and recoverability of our Canadian investments by comparing the estimated fair value of the remaining underlying assets of the Canadian Entities to remaining estimated liabilities. We recorded the contingent liabilities at book value which best approximated fair value. Outstanding liabilities include accounts payable and other liabilities, forward commitments, unsubordinated related party payables, lease liabilities and other potential claims. Potential claims include an accrual for the estimated probable loss related to claims that may be asserted against the Bloom Lake Group and Wabush Group under certain contracts. Claimants may seek damages or other related relief as a result of the Canadian Entities' exit from Canada. Based on our estimates, the fair value of liabilities exceeds the fair value of assets. To assess the fair value and recoverability of the amounts receivable from the Canadian Entities, we estimated the fair value of the underlying net assets of the Canadian Entities available for distribution to their creditors in relation to the estimated creditor claims and the priority of those claims. Our estimates involve significant judgment and are based on currently available information, an assessment of the validity of certain claims and estimated payments made by the Canadian Entities. Our ultimate recovery is subject to the final liquidation value of the Canadian Entities. Further, the final liquidation value and ultimate recovery of the creditors of the Canadian Entities, including Cliffs Natural Resources and various subsidiaries, may impact our estimates of contingent liability exposure described previously. DIP Financing In connection with the Wabush Filing on May 20, 2015, the Montreal Court approved an agreement to provide a debtor-in-possession credit facility (the "DIP financing") to the Wabush Group, which provided for borrowings under the facility up to $10.0 million . The DIP financing was secured by a court-ordered charge over the assets of the Wabush Group. As of December 31, 2015, there was $6.8 million drawn and outstanding under the DIP financing funded by Wabush Iron Co. Limited’s parent company, Cliffs Mining Company. During the three months ended March 31, 2016, the Wabush Group made an additional draw of $1.5 million . We subsequently received a repayment of $8.3 million and as a result, there was no outstanding balance due under the DIP financing arrangement from Wabush Iron Co. Limited’s parent company, Cliffs Mining Company as of September 30, 2016. Income Taxes We recognized no tax benefit for the three and nine months ended September 30, 2016 in Gain (loss) from discontinued operations, net of tax . For the three months ended September 30, 2015, we recognized a tax expense of $0.7 million in Gain (loss) from discontinued operations, net of tax . We recognized no tax benefit or expense for the nine months ended September 30, 2015 in Gain (loss) from discontinued operations, net of tax .

CAPITAL STOCK

CAPITAL STOCK	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
CAPITAL STOCK	NOTE 15 - CAPITAL STOCK Preferred Shares Conversion to Common Shares On January 4, 2016, we announced that our Board of Directors determined the final quarterly dividend of our Preferred Shares would not be paid in cash, but instead, pursuant to the terms of the Preferred Shares, the conversion rate was increased such that holders of the Preferred Shares received additional common shares in lieu of the accrued dividend at the time of the mandatory conversion of the Preferred Shares on February 1, 2016. The number of our common shares in the aggregate issued in lieu of the dividend was 1.3 million . This resulted in an effective conversion rate of 0.9052 common shares, rather than 0.8621 common shares, per depositary share, each representing 1/40 th of a Preferred Share. Upon conversion on February 1, 2016, an aggregate of 26.5 million common shares were issued, representing 25.2 million common shares issuable upon conversion and 1.3 million that were issued in lieu of a final cash dividend. Debt for Equity Exchange During the third quarter of 2016, we entered into a privately negotiated exchange agreement whereby we issued an aggregate of 2.3 million common shares, representing less than one percent of our outstanding common shares, in exchange for $4.5 million aggregate principal amount of our 4.80 percent senior notes due 2020 and $10.5 million aggregate principal amount of our 4.875 percent senior notes due 2021. Accordingly, we recognized a gain of $1.6 million in Gain (loss) on extinguishment/restructuring of debt in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 . The issuance of the common shares in exchange for our senior notes due 2020 and 2021 was made in reliance on the exemption from registration provided in Section 3(a)(9) of the Securities Act. During the second quarter of 2016, we entered into a privately negotiated exchange agreement whereby we issued an aggregate of 1.8 million common shares, representing less than one percent of our outstanding common shares, in exchange for $12.6 million aggregate principal amount of our senior notes due 2020. Accordingly, we recognized a gain of $3.6 million in Gain (loss) on extinguishment/restructuring of debt in the Statements of Unaudited Condensed Consolidated Operations for the nine months ended September 30, 2016 . The issuance of the common shares in exchange for our senior notes due 2020 was made in reliance on the exemption from registration provided in Section 3(a)(9) of the Securities Act. During the first quarter of 2016, we entered into a privately negotiated exchange agreement whereby we issued an aggregate of 1.8 million common shares, representing less than one percent of our outstanding common shares, in exchange for $10.0 million aggregate principal amount of our senior notes due 2018. Accordingly, we recognized a gain of $4.5 million in Gain (loss) on extinguishment/restructuring of debt in the Statements of Unaudited Condensed Consolidated Operations for the nine months ended September 30, 2016 . The issuance of the common shares in exchange for our senior notes due 2018 was made in reliance on the exemption from registration provided in Section 3(a)(9) of the Securities Act. Common Share Public Offering On August 10, 2016, we issued 44.4 million common shares in a public offering. We received net proceeds of approximately $287.6 million at a public offering price of $6.75 per common share. The proceeds from the issuance of our common shares were used to fully redeem our senior notes due 2018.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
SHAREHOLDERS' EQUITY	NOTE 16 - SHAREHOLDERS' EQUITY (DEFICIT) The following table reflects the changes in shareholders' equity (deficit) attributable to both Cliffs and the noncontrolling interests primarily related to Tilden and Empire of which Cliffs owns 85 percent and 79 percent , respectively, for the nine months ended September 30, 2016 and September 30, 2015 : (In Millions) Cliffs Shareholders’ Equity (Deficit) Noncontrolling Interest (Deficit) Total Equity (Deficit) December 31, 2015 $ (1,981.4 ) $ 169.8 $ (1,811.6 ) Comprehensive income Net income 95.0 23.5 118.5 Other comprehensive income 16.8 2.2 19.0 Total comprehensive income 111.8 25.7 137.5 Issuance of common shares 315.2 — 315.2 Stock and other incentive plans 10.1 — 10.1 Distributions of partnership equity — (48.8 ) (48.8 ) Undistributed losses to noncontrolling interest — (2.9 ) (2.9 ) September 30, 2016 $ (1,544.3 ) $ 143.8 $ (1,400.5 ) (In Millions) Cliffs Noncontrolling Total Equity (Deficit) December 31, 2014 $ (1,431.3 ) $ (303.0 ) $ (1,734.3 ) Comprehensive income (loss) Net loss (689.0 ) (1.5 ) (690.5 ) Other comprehensive income (loss) 220.7 (9.3 ) 211.4 Total comprehensive loss (468.3 ) (10.8 ) (479.1 ) Effect of deconsolidation — 528.2 528.2 Stock and other incentive plans 6.0 — 6.0 Preferred share dividends (38.4 ) — (38.4 ) Distributions to noncontrolling interest — (40.7 ) (40.7 ) Undistributed losses to noncontrolling interest — (1.2 ) (1.2 ) September 30, 2015 $ (1,932.0 ) $ 172.5 $ (1,759.5 ) The following table reflects the changes in Accumulated other comprehensive income (loss) related to Cliffs shareholders’ equity for September 30, 2016 and September 30, 2015 : (In Millions) Changes in Pension and Other Post-Retirement Benefits, net of tax Unrealized Net Gain (Loss) on Securities, net of tax Unrealized Net Gain (Loss) on Foreign Currency Translation Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax Accumulated Other Comprehensive Income (Loss) Balance December 31, 2015 $ (241.4 ) $ 0.1 $ 220.7 $ 2.6 $ (18.0 ) Other comprehensive income (loss) before reclassifications (1.5 ) (0.1 ) 4.4 (3.4 ) (0.6 ) Net loss reclassified from accumulated other comprehensive income (loss) 6.3 — — — 6.3 Balance March 31, 2016 $ (236.6 ) $ — $ 225.1 $ (0.8 ) $ (12.3 ) Other comprehensive income (loss) before reclassifications (0.4 ) — (2.7 ) 0.1 (3.0 ) Net loss reclassified from accumulated other comprehensive income (loss) 6.3 — — — 6.3 Balance June 30, 2016 $ (230.7 ) $ — $ 222.4 $ (0.7 ) $ (9.0 ) Other comprehensive income (loss) before reclassifications (0.5 ) — 0.9 — 0.4 Net loss reclassified from accumulated other comprehensive income (loss) 6.7 — — 0.7 7.4 Balance September 30, 2016 $ (224.5 ) $ — $ 223.3 $ — $ (1.2 ) (In Millions) Changes in Pension and Other Post-Retirement Benefits, net of tax Unrealized Net Gain (Loss) on Securities, net of tax Unrealized Net Gain (Loss) on Foreign Currency Translation Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax Accumulated Other Comprehensive Income (Loss) Balance December 31, 2014 $ (291.1 ) $ (1.0 ) $ 64.4 $ (18.1 ) $ (245.8 ) Other comprehensive income (loss) before reclassifications 9.3 2.8 (14.7 ) (7.1 ) (9.7 ) Net loss (gain) reclassified from accumulated other comprehensive income (loss) 30.3 (2.0 ) 182.7 6.3 217.3 Balance March 31, 2015 $ (251.5 ) $ (0.2 ) $ 232.4 $ (18.9 ) $ (38.2 ) Other comprehensive income (loss) before reclassifications 1.3 1.0 1.2 0.5 4.0 Net loss (gain) reclassified from accumulated other comprehensive income (loss) (1.6 ) (0.9 ) — 7.8 5.3 Balance June 30, 2015 $ (251.8 ) $ (0.1 ) $ 233.6 $ (10.6 ) $ (28.9 ) Other comprehensive income (loss) before reclassifications (0.7 ) 0.1 (11.4 ) 4.8 (7.2 ) Net loss reclassified from accumulated other comprehensive income (loss) 6.6 — — 4.4 11.0 Balance September 30, 2015 $ (245.9 ) $ — $ 222.2 $ (1.4 ) $ (25.1 ) The following table reflects the details about Accumulated other comprehensive income (loss) components related to Cliffs shareholders’ equity for the three and nine months ended September 30, 2016 : (In Millions) Details about Accumulated Other Comprehensive Income (Loss) Components Amount of (Gain)/Loss Reclassified into Income Affected Line Item in the Statement of Unaudited Condensed Consolidated Operations Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Amortization of pension and postretirement benefit liability: Prior service costs (1) $ (0.4 ) $ 1.1 $ (1.2 ) $ 0.5 Net actuarial loss (1) 7.1 5.6 20.4 19.5 Settlements/curtailments (1) — (0.1 ) — 0.2 Effect of deconsolidation (2) — — — 15.1 Loss from Discontinued Operations, net of tax 6.7 6.6 19.2 35.3 Total before taxes — — — — Income tax benefit (expense) $ 6.7 $ 6.6 $ 19.2 $ 35.3 Net of taxes Unrealized gain (loss) on marketable securities: Impairment — — — (3.2 ) Other non-operating income (expense) — — — 0.3 Income tax benefit (expense) $ — $ — $ — $ (2.9 ) Net of taxes Unrealized gain (loss) on foreign currency translation: Effect of deconsolidation (2) $ — $ — $ — $ 182.7 Loss from Discontinued Operations, net of tax — — — — Income tax benefit (expense) $ — $ — $ — $ 182.7 Net of taxes Unrealized gain (loss) on derivative financial instruments: Australian dollar foreign exchange contracts $ — $ 6.3 $ — $ 26.4 Product revenues Treasury lock 1.2 — 1.2 — Gain (loss) on extinguishment/restructuring of debt (0.5 ) (1.9 ) (0.5 ) (7.9 ) Income tax benefit (expense) $ 0.7 $ 4.4 $ 0.7 $ 18.5 Net of taxes Total Reclassifications for the Period $ 7.4 $ 11.0 $ 19.9 $ 233.6 (1) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. See NOTE 7 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information. (2) Represents Canadian accumulated currency translation adjustments that were deconsolidated. See NOTE 14 - DISCONTINUED OPERATIONS for further information.

CASH FLOW INFORMATION

CASH FLOW INFORMATION	9 Months Ended
	Sep. 30, 2016
Supplemental Cash Flow Information [Abstract]
Cash Flow Information	NOTE 17 - CASH FLOW INFORMATION A reconciliation of capital additions to cash paid for capital expenditures for the nine months ended September 30, 2016 and 2015 is as follows: (In Millions) Nine Months Ended 2016 2015 Capital additions (1) $ 44.5 $ 69.0 Cash paid for capital expenditures 45.8 57.9 Difference $ (1.3 ) $ 11.1 Non-cash accruals $ (1.3 ) $ 10.4 Capital leases — 0.7 Total $ (1.3 ) $ 11.1 (1) Includes capital additions of $44.5 million related to continuing operations for the nine months ended September 30, 2016 . Includes capital additions of $46.6 million and $22.4 million related to continuing operations and discontinued operations, respectively, for the nine months ended September 30, 2015 .

RELATED PARTIES

RELATED PARTIES	9 Months Ended
	Sep. 30, 2016
Related Party Transactions [Abstract]
RELATED PARTIES	NOTE 18 - RELATED PARTIES Three of our five U.S. iron ore mines are owned with various joint venture partners that are integrated steel producers or their subsidiaries. We are the manager of each of the mines we co-own and rely on our joint venture partners to make their required capital contributions and to pay for their share of the iron ore pellets that we produce. The joint venture partners are also our customers. The following is a summary of the mine ownership of these iron ore mines at September 30, 2016 : Mine Cliffs Natural Resources ArcelorMittal U.S. Steel Corporation Empire 79.0 % 21.0 % — Tilden 85.0 % — 15.0 % Hibbing 23.0 % 62.3 % 14.7 % ArcelorMittal has a unilateral right to put its interest in the Empire mine to us, but has not exercised this right to date. Furthermore, as part of the 2014 extension agreement that was entered into between us and ArcelorMittal, which amended certain terms of the Empire partnership agreement, certain minimum distributions of the partners’ equity amounts are required to be made on a quarterly basis beginning in the first quarter of 2015 and will continue through the first quarter of 2017. During the three and nine months ended September 30, 2016 , we recorded distributions of $7.4 million and $48.8 million , respectively, under this agreement of which $41.4 million was paid as of September 30, 2016 . In addition, we paid $11.1 million in January 2016 related to 2015 distributions. During the three and nine months ended September 30, 2015 , we recorded distributions of $9.0 million and $40.7 million under this agreement, of which $31.7 million was paid as of September 30, 2015 . Product revenues from related parties were as follows: (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Product revenues from related parties $ 223.4 $ 208.0 $ 568.4 $ 468.0 Total product revenues 508.6 542.5 1,237.0 1,399.9 Related party product revenue as a percent of total product revenue 43.9 % 38.3 % 45.9 % 33.4 % Amounts due from related parties recorded in Accounts receivable, net and Other current assets , including trade accounts receivable, a customer supply agreement and provisional pricing arrangements, were $52.2 million and $15.8 million at September 30, 2016 and December 31, 2015 , respectively. Amounts due to related parties recorded in Accounts payable , including provisional pricing arrangements, were $7.4 million at September 30, 2016 and amounts including provisional pricing arrangements and liabilities to related parties were $14.5 million at December 31, 2015 .

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 19 - EARNINGS PER SHARE The following table summarizes the computation of basic and diluted earnings (loss) per share: (In Millions, Except Per Share Amounts) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Income (Loss) from Continuing Operations $ (25.1 ) $ 49.9 $ 119.1 $ 178.5 Loss (Income) from Continuing Operations Attributable to Noncontrolling Interest 2.0 4.6 (23.5 ) (6.2 ) Net Income (Loss) from Continuing Operations Attributable to Cliffs Shareholders $ (23.1 ) $ 54.5 $ 95.6 $ 172.3 Loss from Discontinued Operations, net of tax (2.7 ) (43.9 ) (0.6 ) (861.3 ) Net Income (Loss) Attributable to Cliffs Shareholders $ (25.8 ) $ 10.6 $ 95.0 $ (689.0 ) Preferred Stock Dividends — (25.6 ) — (38.4 ) Net Income (Loss) Attributable to Cliffs Common Shareholders $ (25.8 ) $ (15.0 ) $ 95.0 $ (727.4 ) Weighted Average Number of Shares: Basic 206.3 153.2 186.5 153.2 Employee Stock Plans — — 2.0 — Diluted 206.3 153.2 188.5 153.2 Earnings (Loss) per Common Share Attributable to Continuing operations $ (0.11 ) $ 0.19 $ 0.51 $ 0.87 Discontinued operations (0.01 ) (0.29 ) — (5.62 ) $ (0.12 ) $ (0.10 ) $ 0.51 $ (4.75 ) Earnings (Loss) per Common Share Attributable to Continuing operations $ (0.11 ) $ 0.19 $ 0.51 $ 0.87 Discontinued operations (0.01 ) (0.29 ) — (5.62 ) $ (0.12 ) $ (0.10 ) $ 0.51 $ (4.75 ) The diluted earnings per share calculation excludes 25.2 million depositary shares that were anti-dilutive for the three and nine months ended September 30, 2015. Additionally, the diluted earnings per share calculation excludes 3.0 million shares for the three months ended September 30, 2016, and 0.1 million shares and 0.2 million shares for the three and nine months ended September 30, 2015, related to equity plan awards that would have been anti-dilutive.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	NOTE 20 - COMMITMENTS AND CONTINGENCIES Contingencies Litigation We are currently a party to various claims and legal proceedings incidental to our operations. If management believes that a loss arising from these matters is probable and can reasonably be estimated, we record the amount of the loss, or the minimum estimated liability when the loss is estimated using a range, and no point within the range is more probable than another. As additional information becomes available, any potential liability related to these matters is assessed and the estimates are revised, if necessary. Based on currently available information, management believes that the ultimate outcome of these matters, individually and in the aggregate, will not have a material effect on our financial position, results of operations or cash flows. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. An unfavorable ruling could include monetary damages, additional funding requirements or an injunction. If an unfavorable ruling were to occur, there exists the possibility of a material impact on the financial position and results of operations of the period in which the ruling occurs, or future periods. However, we do not believe that any pending litigation will result in a material liability in relation to our consolidated financial statements. Currently, we have recorded a liability in Accrued expenses in the Statements of Unaudited Condensed Consolidated Financial Position related to the following matter: Michigan Electricity Matters. On February 19, 2015, in connection with various proceedings before FERC with respect to certain cost allocations for continued operation of the Presque Isle Power Plant in Marquette, Michigan, FERC issued an order directing MISO to submit a revised methodology for allocating SSR costs that identified the load serving entities that require the operation of SSR units at the power plant for reliability purposes. On September 17, 2015, FERC issued an order conditionally approving MISO’s revised allocation methodology. On September 22, 2016, FERC denied requests for rehearing of the February 19 order, rejecting arguments that FERC did not have the authority to order refunds in a cost allocation case and to impose retroactive surcharges to effectuate such refunds. FERC, however, suspended any refunds and surcharges pending its review of a July 25, 2016 ALJ initial decision on the appropriate amount of SSR compensation. Should FERC award SSR costs based on retroactive surcharges and the amount of SSR compensation not be adjusted, our current estimate of the potential liability to the Empire and Tilden mines is approximately $13.6 million , based on MISO's June 14, 2016 refund report (as revised in MISO's July 20, 2016 errata refund report) for the Escanaba, White Pine and Presque Isle SSRs. We, however, continue to vigorously challenge both the amount of the SSR compensation and the imposition of any SSR costs before FERC and the U.S. Court of Appeals for the D.C. Circuit.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	NOTE 21 - SUBSEQUENT EVENTS We have evaluated subsequent events through the date of financial issuance.

BASIS OF PRESENTATION AND SIG29

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Consolidation	Basis of Consolidation The unaudited condensed consolidated financial statements include our accounts and the accounts of our wholly-owned and majority-owned subsidiaries, including the following operations as of September 30, 2016 : Name Location Ownership Interest Operation Status of Operations Northshore Minnesota 100.0% Iron Ore Active United Taconite Minnesota 100.0% Iron Ore Active Tilden Michigan 85.0% Iron Ore Active Empire Michigan 79.0% Iron Ore Idle Koolyanobbing Western Australia 100.0% Iron Ore Active Intercompany transactions and balances are eliminated upon consolidation.
Equity Method Investments	Equity Method Investments Our 23 percent ownership interest in Hibbing is recorded as an equity method investment. As of September 30, 2016 and December 31, 2015 , our investment in Hibbing was $1.9 million and $2.4 million , respectively, classified as Other liabilities in the Statements of Unaudited Condensed Consolidated Financial Position .
Foreign Currency	Foreign Currency Our financial statements are prepared with the U.S. dollar as the reporting currency. The functional currency of our Australian subsidiaries is the Australian dollar. The functional currency of all other international subsidiaries is the U.S. dollar. The financial statements of international subsidiaries are translated into U.S. dollars using the exchange rate at each balance sheet date for assets and liabilities and a weighted average exchange rate for each period for revenues, expenses, gains and losses. Where the local currency is the functional currency, translation adjustments are recorded as Accumulated other comprehensive loss . Income taxes generally are not provided for foreign currency translation adjustments. To the extent that monetary assets and liabilities, inclusive of intercompany notes, are recorded in a currency other than the functional currency, these amounts are remeasured each reporting period, with the resulting gain or loss being recorded in the Statements of Unaudited Condensed Consolidated Operations . Transaction gains and losses resulting from remeasurement of short-term intercompany loans are included in Miscellaneous - net in the Statements of Unaudited Condensed Consolidated Operations . For the three and nine months ended September 30, 2016 , we incurred a net loss of $0.3 million and $1.2 million , respectively, from the impact of transaction gains and losses resulting from remeasurement. Of these amounts, for the three months ended September 30, 2016 , losses of $1.1 million and gains of $0.6 million and for the nine months ended September 30, 2016 , gains of $0.3 million and losses of $2.0 million resulted from remeasurement of cash and cash equivalents and remeasurement of certain obligations, respectively. For the three and nine months ended September 30, 2015 , net gains of $2.4 million and $15.2 million , respectively, related to the impact of transaction gains and losses resulting from remeasurement. Of these amounts, for the three months ended September 30, 2015 , gains of $0.1 million and $1.3 million , respectively, resulted from remeasurement of short-term intercompany loans and cash and cash equivalents. Additionally, of these amounts for the nine months ended September 30, 2015 , gains of $11.1 million and $2.0 million resulted from remeasurement of short-term intercompany loans and cash and cash equivalents, respectively.
Significant Accounting Policies	Significant Accounting Policies A detailed description of our significant accounting policies can be found in the audited financial statements for the fiscal year ended December 31, 2015 included in our Annual Report on Form 10-K filed with the SEC. There have been no material changes in our significant accounting policies and estimates from those disclosed therein.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Issued and Not Effective In February 2016, the FASB issued ASU No. 2016-02, Leases. The new standard requires recognition of lease assets and lease liabilities for leases previously classified as operating leases. The guidance is effective for fiscal years beginning after December 15, 2018. We are currently reviewing the guidance and assessing the potential impact on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Stock Compensation - Improvements to Employee Share-Based Payment Accounting. The new standard is intended to simplify several aspects of the accounting for share-based payment award transactions. The guidance is effective for fiscal years beginning after December 15, 2016, and early adoption is permitted. We are currently reviewing the guidance and assessing the potential impact on our consolidated financial statements. Issued and Adopted In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments. The new standard addresses eight specific changes to how cash receipts and cash payments are presented and classified in the statement of cash flows. The guidance is effective for interim and annual reporting periods beginning after December 15, 2017, and early adoption is permitted. We have adopted the guidance for the period ended September 30, 2016 and have applied this amended accounting guidance to the Statements of Unaudited Condensed Consolidated Cash Flows for all periods presented. The adoption of ASU 2016-15 did not have an impact on prior results reported in the Statements of Unaudited Condensed Consolidated Cash Flows .

BASIS OF PRESENTATION AND SIG30

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule Of Subsidiaries	The unaudited condensed consolidated financial statements include our accounts and the accounts of our wholly-owned and majority-owned subsidiaries, including the following operations as of September 30, 2016 : Name Location Ownership Interest Operation Status of Operations Northshore Minnesota 100.0% Iron Ore Active United Taconite Minnesota 100.0% Iron Ore Active Tilden Michigan 85.0% Iron Ore Active Empire Michigan 79.0% Iron Ore Idle Koolyanobbing Western Australia 100.0% Iron Ore Active

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Schedule Of Segment Reporting Information, By Segment	The following tables present a summary of our reportable segments for the three and nine months ended September 30, 2016 and 2015 , including a reconciliation of segment sales margin to Income (Loss) from Continuing Operations Before Income Taxes and a reconciliation of Net Income (Loss) to EBITDA and Adjusted EBITDA: (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Revenues from product sales and services: U.S. Iron Ore $ 428.3 77 % $ 471.0 79 % $ 975.5 72 % $ 1,152.5 75 % Asia Pacific Iron Ore 125.0 23 % 122.2 21 % 379.5 28 % 384.8 25 % Total revenues from product sales and services $ 553.3 100 % $ 593.2 100 % $ 1,355.0 100 % $ 1,537.3 100 % Sales margin: U.S. Iron Ore $ 66.5 $ 48.7 $ 149.7 $ 177.7 Asia Pacific Iron Ore 18.9 6.4 58.1 15.5 Sales margin 85.4 55.1 207.8 193.2 Other operating expense (50.7 ) (25.9 ) (98.7 ) (66.4 ) Other income (expense) (66.9 ) 17.4 8.3 221.7 Income (loss) from continuing operations before income taxes $ (32.2 ) $ 46.6 $ 117.4 $ 348.5 (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Net Income (Loss) $ (27.8 ) $ 6.0 $ 118.5 $ (690.5 ) Less: Interest expense, net (48.7 ) (62.3 ) (156.2 ) (170.7 ) Income tax benefit (expense) 7.1 4.8 1.7 (167.3 ) Depreciation, depletion and amortization (26.8 ) (35.6 ) (88.9 ) (99.1 ) EBITDA $ 40.6 $ 99.1 $ 361.9 $ (253.4 ) Less: Impairment of other long-lived assets $ — $ — $ — $ (3.3 ) Impact of discontinued operations (2.7 ) (44.8 ) (0.6 ) (865.9 ) Gain (loss) on extinguishment/restructuring of debt (18.3 ) 79.2 164.1 392.9 Severance and contractor termination costs — 2.2 (0.1 ) (9.3 ) Foreign exchange remeasurement (0.3 ) 2.4 (1.2 ) 15.2 Adjusted EBITDA $ 61.9 $ 60.1 $ 199.7 $ 217.0 EBITDA: U.S. Iron Ore $ 61.1 $ 69.2 $ 196.6 $ 239.6 Asia Pacific Iron Ore 21.2 11.1 69.6 38.7 Other (41.7 ) 18.8 95.7 (531.7 ) Total EBITDA $ 40.6 $ 99.1 $ 361.9 $ (253.4 ) Adjusted EBITDA: U.S. Iron Ore $ 65.3 $ 72.3 $ 208.6 $ 254.6 Asia Pacific Iron Ore 23.7 9.7 73.2 32.8 Other (27.1 ) (21.9 ) (82.1 ) (70.4 ) Total Adjusted EBITDA $ 61.9 $ 60.1 $ 199.7 $ 217.0 (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Depreciation, depletion and amortization: U.S. Iron Ore $ 18.8 $ 27.9 $ 65.1 $ 71.6 Asia Pacific Iron Ore 6.3 6.1 19.2 19.1 Other 1.7 1.6 4.6 5.2 Total depreciation, depletion and amortization $ 26.8 $ 35.6 $ 88.9 $ 95.9 Capital additions 1 : U.S. Iron Ore $ 25.8 $ 15.0 $ 39.5 $ 35.8 Asia Pacific Iron Ore 0.2 0.3 0.2 4.8 Other 0.4 2.4 4.8 6.0 Total capital additions $ 26.4 $ 17.7 $ 44.5 $ 46.6 1 Includes capital lease additions and non-cash accruals. Refer to NOTE 17 - CASH FLOW INFORMATION .
Summary of Assets by Segment	A summary of assets by segment is as follows: (In Millions) September 30, December 31, Assets: U.S. Iron Ore $ 1,429.0 $ 1,476.4 Asia Pacific Iron Ore 137.7 202.5 Total segment assets 1,566.7 1,678.9 Corporate 206.2 441.7 Assets of Discontinued Operations — 14.9 Total assets $ 1,772.9 $ 2,135.5

INVENTORIES (Tables)

INVENTORIES (Tables)	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Schedule Of Inventories	The following table presents the detail of our Inventories in the Statements of Unaudited Condensed Consolidated Financial Position as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, 2016 December 31, 2015 Segment Finished Goods Work-in Process Total Inventory Finished Goods Work-in Process Total Inventory U.S. Iron Ore $ 248.8 $ 20.4 $ 269.2 $ 252.3 $ 11.7 $ 264.0 Asia Pacific Iron Ore 17.3 30.8 48.1 20.8 44.8 65.6 Total $ 266.1 $ 51.2 $ 317.3 $ 273.1 $ 56.5 $ 329.6

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Value Of Each Of The Major Classes Of Consolidated Depreciable Assets	The following table indicates the value of each of the major classes of our consolidated depreciable assets as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, December 31, Land rights and mineral rights $ 500.5 $ 500.5 Office and information technology 63.6 71.0 Buildings 61.1 60.4 Mining equipment 598.7 594.0 Processing equipment 541.2 516.8 Electric power facilities 49.6 46.4 Land improvements 24.8 24.8 Asset retirement obligation 18.3 87.9 Other 28.4 28.2 Construction in-progress 37.9 40.3 1,924.1 1,970.3 Allowance for depreciation and depletion (934.0 ) (911.3 ) $ 990.1 $ 1,059.0

DEBT AND CREDIT FACILITIES (Tab

DEBT AND CREDIT FACILITIES (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Schedule Of Long-Term Debt	The following represents a summary of our long-term debt as of September 30, 2016 and December 31, 2015 : ($ in Millions) September 30, 2016 Debt Instrument Annual Effective Interest Rate Total Principal Amount Debt Issuance Costs Undiscounted Interest/(Unamortized Discounts) Total Debt $700 Million 4.875% 2021 Senior Notes 4.89% $ 325.7 $ (1.2 ) $ (0.2 ) $ 324.3 (1) $1.3 Billion Senior Notes: $500 Million 4.80% 2020 Senior Notes 4.83% 244.8 (0.7 ) (0.2 ) 243.9 (2) $800 Million 6.25% 2040 Senior Notes 6.34% 298.4 (2.5 ) (3.4 ) 292.5 (3) $400 Million 5.90% 2020 Senior Notes 5.98% 225.6 (0.7 ) (0.5 ) 224.4 (4) $500 Million 3.95% 2018 Senior Notes 6.15% — — — — (5) $540 Million 8.25% 2020 First Lien Notes 9.97% 540.0 (8.6 ) (27.4 ) 504.0 $218.5 Million 8.00% 2020 1.5 Lien Notes N/A 218.5 — 70.0 288.5 (6) $544.2 Million 7.75% 2020 Second Lien Notes 15.55% 430.1 (6.2 ) (90.1 ) 333.8 (7) $550 Million ABL Facility: ABL Facility N/A 550.0 N/A N/A — (8) Fair Value Adjustment to Interest Rate Hedge 2.0 Total debt $ 2,833.1 $ 2,213.4 Less: Current portion 17.5 Long-term debt $ 2,195.9 ($ in Millions) December 31, 2015 Debt Instrument Annual Effective Interest Rate Total Principal Amount Debt Issuance Costs Unamortized Discounts Total Debt $700 Million 4.875% 2021 Senior Notes 4.89% $ 412.5 $ (1.7 ) $ (0.2 ) $ 410.6 $1.3 Billion Senior Notes: $500 Million 4.80% 2020 Senior Notes 4.83% 306.7 (1.1 ) (0.4 ) 305.2 $800 Million 6.25% 2040 Senior Notes 6.34% 492.8 (4.3 ) (5.8 ) 482.7 $400 Million 5.90% 2020 Senior Notes 5.98% 290.8 (1.1 ) (0.8 ) 288.9 $500 Million 3.95% 2018 Senior Notes 6.30% 311.2 (0.9 ) (1.2 ) 309.1 $540 Million 8.25% 2020 First Lien Notes 9.97% 540.0 (10.5 ) (32.1 ) 497.4 $544.2 Million 7.75% 2020 Second Lien Notes 15.55% 544.2 (9.5 ) (131.5 ) 403.2 $550 Million ABL Facility: ABL Facility N/A 550.0 N/A N/A — (9) Fair Value Adjustment to Interest Rate Hedge 2.3 Total debt $ 3,448.2 $ 2,699.4 (1) On March 2, 2016, we exchanged as part of an exchange offer $76.3 million of the 4.875 percent senior notes for $30.5 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $41.5 million , including undiscounted interest payments as of the transaction date. Additionally, during the third quarter of 2016 we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction. (2) On March 2, 2016, we exchanged as part of an exchange offer $44.7 million of the 4.80 percent senior notes for $17.9 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $24.4 million , including undiscounted interest payments as of the transaction date. Additionally, during the second and third quarters of 2016 we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction. (3) On March 2, 2016, we exchanged as part of an exchange offer $194.4 million of the 6.25 percent senior notes for $75.8 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $103.0 million , including undiscounted interest payments as of the transaction date. (4) On March 2, 2016, we exchanged as part of an exchange offer $65.1 million of the 5.90 percent senior notes for $26.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $35.4 million , including undiscounted interest payments as of the transaction date. (5) See the section entitled " $500 million 3.95 percent 2018 Senior Notes - Full Redemption " below for further discussion related to this instrument. On March 2, 2016, we exchanged as part of an exchange offer $17.6 million of the 3.95 percent senior notes for $11.4 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $15.5 million , including undiscounted interest payments as of the transaction date. Additionally, during the first quarter of 2016, we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction. (6) See the section entitled " $218.5 million 8.00 percent 2020 Senior Secured 1.5 Lien Notes - 2016 Exchange Offers" below for further discussion related to this instrument. As of September 30, 2016 , $17.5 million of the undiscounted interest is recorded as current and classified as Other current liabilities in the Statements of Unaudited Condensed Consolidated Financial Position. (7) On March 2, 2016, we exchanged as part of an exchange offer $114.1 million of the 7.75 percent senior notes for $57.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $77.5 million , including undiscounted interest payments as of the transaction date. (8) As of September 30, 2016 , no loans were drawn under the ABL Facility and we had total availability of $355.7 million as a result of borrowing base limitations. As of September 30, 2016 , the principal amount of letter of credit obligations totaled $108.8 million , thereby further reducing available borrowing capacity on our ABL Facility to $246.9 million . (9) As of December 31, 2015 , no loans were drawn under the ABL Facility and we had total availability of $366.0 million as a result of borrowing base limitations. As of December 31, 2015 , the principal amount of letter of credit obligations totaled $186.3 million and commodity hedge obligations totaled $0.5 million , thereby further reducing available borrowing capacity on our ABL Facility to $179.2 million .
Schedule of Maturities of Long-term Debt	Debt Maturities The following represents a summary of our maturities of debt instruments, excluding borrowings on the ABL Facility, based on the principal amounts outstanding at September 30, 2016 : (In Millions) Maturities of Debt 2016 (October 1 - December 31) $ — 2017 — 2018 — 2019 — 2020 1,659.0 2021 325.7 2022 and thereafter 298.4 Total maturities of debt $ 2,283.1

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value, Recurring and Nonrecurring, Valuation Techniques	The following table illustrates information about quantitative inputs and assumptions for the derivative assets and derivative liabilities categorized in Level 3 of the fair value hierarchy: Qualitative/Quantitative Information About Level 3 Fair Value Measurements (In Millions) Fair Value at September 30, 2016 Balance Sheet Location Valuation Technique Unobservable Input Range or Point Estimate per dry metric ton (Weighted Average) Provisional pricing arrangements $ 0.4 Other current assets Market Approach Management's Estimate of 62% Fe $56 $ 2.7 Other current liabilities Customer supply agreement $ 28.0 Other current assets Market Approach Hot-Rolled Coil Estimate $430 - $530 ($470)
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation	The following tables represent a reconciliation of the changes in fair value of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2016 and 2015 . (In Millions) Derivative Assets (Level 3) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Beginning balance $ 25.8 $ 7.7 $ 7.8 $ 63.2 Total gains (losses) Included in earnings 14.6 15.0 62.6 28.1 Settlements (12.0 ) (12.3 ) (42.0 ) (80.9 ) Transfers into Level 3 — — — — Transfers out of Level 3 — — — — Ending balance - September 30 $ 28.4 $ 10.4 $ 28.4 $ 10.4 Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date $ 8.2 $ 12.2 $ 24.7 $ 22.7
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	(In Millions) Derivative Liabilities (Level 3) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Beginning balance $ (2.6 ) $ (8.0 ) $ (3.4 ) $ (9.5 ) Total gains (losses) Included in earnings (2.9 ) (13.7 ) (12.8 ) (45.4 ) Settlements 2.8 20.9 13.5 54.1 Transfers into Level 3 — — — — Transfers out of Level 3 — — — — Ending balance - September 30 $ (2.7 ) $ (0.8 ) $ (2.7 ) $ (0.8 ) Total losses for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date $ (2.7 ) $ (0.5 ) $ (2.7 ) $ (0.8 )
Schedule Of Carrying Value And Fair Value Of Financial Instruments	A summary of the carrying amount and fair value of other financial instruments at September 30, 2016 and December 31, 2015 were as follows: (In Millions) September 30, 2016 December 31, 2015 Classification Carrying Value Fair Value Carrying Value Fair Value Long-term debt: Senior Notes—$700 million Level 1 $ 324.3 $ 260.6 $ 410.6 $ 69.4 Senior Notes—$1.3 billion Level 1 536.4 400.7 787.9 137.4 Senior Notes—$400 million Level 1 224.4 194.9 288.9 52.8 Senior Notes—$500 million Level 1 — — 309.1 87.1 Senior First Lien Notes —$540 million Level 1 504.0 573.2 497.4 414.5 Senior 1.5 Lien Notes —$218.5 million Level 2 288.5 210.9 — — Senior Second Lien Notes —$544.2 million Level 1 333.8 402.8 403.2 134.7 ABL Facility Level 2 — — — — Fair value adjustment to interest rate hedge Level 2 2.0 2.0 2.3 2.3 Total long-term debt $ 2,213.4 $ 2,045.1 $ 2,699.4 $ 898.2

PENSIONS AND OTHER POSTRETIRE36

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)	9 Months Ended
	Sep. 30, 2016
Postemployment Benefits [Abstract]
Schedule of Net Benefit Costs	The following are the components of defined benefit pension and OPEB expense for the three and nine months ended September 30, 2016 and 2015 : Defined Benefit Pension Expense (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Service cost $ 4.2 $ 3.1 $ 13.2 $ 15.7 Interest cost 7.8 9.0 22.7 27.9 Expected return on plan assets (13.6 ) (14.5 ) (41.0 ) (44.4 ) Amortization: Prior service costs 0.5 0.5 1.6 1.7 Net actuarial loss 5.4 4.5 15.9 15.3 Curtailments/settlements — $ (0.1 ) — 0.2 Net periodic benefit cost to continuing operations $ 4.3 $ 2.5 $ 12.4 $ 16.4 Other Postretirement Benefits Expense (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Service cost $ 0.4 $ (1.6 ) $ 1.3 $ 1.4 Interest cost 2.3 2.1 6.8 8.6 Expected return on plan assets (4.3 ) (4.5 ) (12.8 ) (13.7 ) Amortization: Prior service credits (0.9 ) 0.6 (2.8 ) (1.2 ) Net actuarial loss 1.7 1.1 4.5 4.2 Net periodic benefit credit to continuing operations $ (0.8 ) $ (2.3 ) $ (3.0 ) $ (0.7 )

LEASE OBLIGATIONS (Tables)

LEASE OBLIGATIONS (Tables)	9 Months Ended
	Sep. 30, 2016
Leases [Abstract]
Schedule Of Future Minimum Lease Payments For Capital Leases And Operating Leases	Future minimum payments under capital leases and non-cancellable operating leases at September 30, 2016 are as follows: (In Millions) Capital Leases Operating Leases 2016 (October 1 - December 31) $ 6.4 $ 2.3 2017 23.4 8.9 2018 18.9 7.6 2019 10.5 4.9 2020 9.4 4.9 2021 and thereafter 9.4 5.0 Total minimum lease payments $ 78.0 $ 33.6 Amounts representing interest 14.2 Present value of net minimum lease payments $ 63.8 (1) (1) The total is comprised of $18.3 million and $45.5 million classified as Other current liabilities and Other liabilities , respectively, in the Statements of Unaudited Condensed Consolidated Financial Position at September 30, 2016 .

ENVIRONMENTAL AND MINE CLOSUR38

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Tables)	9 Months Ended
	Sep. 30, 2016
Environmental Remediation Obligations [Abstract]
Summary Of Mine Closure Obligations	The following is a summary of the obligations as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, December 31, Environmental $ 3.0 $ 3.6 Mine closure LTVSMC 25.0 24.1 Operating mines: U.S. Iron Ore 176.8 189.9 Asia Pacific Iron Ore 18.0 16.4 Total mine closure 219.8 230.4 Total environmental and mine closure obligations 222.8 234.0 Less current portion 2.6 2.8 Long term environmental and mine closure obligations $ 220.2 $ 231.2
Asset Retirement Obligation Disclosure	The following represents a rollforward of our asset retirement obligation liability related to our active mining locations for the nine months ended September 30, 2016 and for the year ended December 31, 2015 : (In Millions) September 30, December 31, 2015 Asset retirement obligation at beginning of period $ 206.3 $ 142.4 Accretion expense 8.4 6.5 Exchange rate changes 0.9 (1.1 ) Revision in estimated cash flows (20.8 ) 58.5 Asset retirement obligation at end of period $ 194.8 $ 206.3

GOODWILL AND OTHER INTANGIBLE39

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Finite-Lived Intangible Assets By Major Class	The following table is a summary of intangible assets and liabilities as of September 30, 2016 and December 31, 2015 : (In Millions) September 30, 2016 December 31, 2015 Classification Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Definite-lived intangible assets: Permits Other non-current assets $ 78.7 $ (23.8 ) $ 54.9 $ 78.4 $ (20.2 ) $ 58.2 Total intangible assets $ 78.7 $ (23.8 ) $ 54.9 $ 78.4 $ (20.2 ) $ 58.2 Below-market sales contracts Other current liabilities $ (23.1 ) $ 15.4 $ (7.7 ) $ (23.1 ) $ — $ (23.1 ) Below-market sales contracts Other liabilities (205.8 ) 205.8 — (205.8 ) 205.8 — Total below-market sales contracts $ (228.9 ) $ 221.2 $ (7.7 ) $ (228.9 ) $ 205.8 $ (23.1 )
Estimated Amortization Expense Relating To Intangible Assets	The estimated amortization expense relating to intangible assets for the remainder of this year and each of the five succeeding years is as follows: (In Millions) Amount Year Ending December 31, 2016 (remaining three months) $ 1.0 2017 4.2 2018 4.2 2019 2.5 2020 2.5 2021 2.5 Total $ 16.9

DERIVATIVE INSTRUMENTS (Tables)

DERIVATIVE INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value	The following table presents the fair value of our derivative instruments and the classification of each in the Statements of Unaudited Condensed Consolidated Financial Position as of September 30, 2016 and December 31, 2015 : (In Millions) Derivative Assets Derivative Liabilities September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 Derivative Instrument Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Customer supply agreement Other current assets 28.0 Other current assets 5.8 — — Provisional pricing arrangements Other current assets 0.4 Other current assets 2.0 Other current liabilities 2.7 Other current liabilities 3.4 Commodity contracts — — — Other current liabilities 0.6 Total derivatives not designated as hedging instruments under ASC 815 $ 28.4 $ 7.8 $ 2.7 $ 4.0
Schedule Of Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance Location Table	The following summarizes the effect of our derivatives that are not designated as hedging instruments in the Statements of Unaudited Condensed Consolidated Operations for the three and nine months ended September 30, 2016 and 2015 : (In Millions) Derivatives Not Designated as Hedging Instruments Location of Gain (Loss) Recognized in Amount of Gain (Loss) Recognized in Income on Derivative Three Months Ended Nine Months Ended 2016 2015 2016 2015 Customer supply agreement Product revenues 7.1 11.6 26.8 22.1 Provisional pricing arrangements Product revenues 4.5 7.6 22.9 (0.2 ) Foreign exchange contracts Other non-operating income (expense) — (1.1 ) — (3.6 ) Commodity contracts Cost of goods sold and operating expenses — — — (3.4 ) Foreign exchange contracts Product revenues — (2.1 ) — (11.8 ) $ 11.6 $ 16.0 $ 49.7 $ 3.1

DISCONTINUED OPERATIONS (Tables

DISCONTINUED OPERATIONS (Tables)	9 Months Ended
	Sep. 30, 2016
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The chart below provides an asset group breakout for each financial statement line impacted by discontinued operations. (In Millions) Canadian Operations North American Coal Eastern Canadian Iron Ore Other Total Canadian Operations Total of Discontinued Operations Statements of Unaudited Condensed Consolidated Operations Loss from Discontinued Operations, net of tax QTD $ (1.8 ) $ (0.9 ) $ — $ (0.9 ) $ (2.7 ) Loss from Discontinued Operations, net of tax QTD $ (29.8 ) $ (14.1 ) $ — $ (14.1 ) $ (43.9 ) Income (Loss) from Discontinued Operations, net of tax YTD $ (3.8 ) $ 3.2 $ — $ 3.2 $ (0.6 ) Loss from Discontinued Operations, net of tax YTD $ (137.0 ) $ (731.9 ) $ (0.1 ) $ (732.0 ) $ (869.0 ) Statements of Unaudited Condensed Consolidated Financial Position Short-term assets of discontinued operations As of September 30, 2016 $ — $ — $ — $ — $ — Short-term liabilities of discontinued operations As of $ 5.5 $ — $ — $ — $ 5.5 Short-term assets of discontinued operations As of December 31, 2015 $ 14.9 $ — $ — $ — $ 14.9 Short-term liabilities of discontinued operations As of $ 6.9 $ — $ — $ — $ 6.9 Non-Cash Operating and Investing Activities Depreciation, depletion and amortization: YTD $ 3.2 $ — $ — $ — $ 3.2 Purchase of property, plant and equipment YTD $ 13.1 $ — $ — $ — $ 13.1 Impairment of other long-lived assets YTD $ 73.4 $ — $ — $ — $ 73.4
North American Coal [Member]
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]
Schedule of Disposal Groups, including Discontinued Operations, Income Statement	(In Millions) Three Months Ended September 30, Nine Months Ended Loss from Discontinued Operations 2016 2015 2016 2015 Revenues from product sales and services $ — $ 78.8 $ — $ 338.1 Cost of goods sold and operating expenses — (102.9 ) — (377.2 ) Sales margin — (24.1 ) — (39.1 ) Other operating expense (1.8 ) (7.4 ) (3.8 ) (25.7 ) Other expense — (0.4 ) — (1.4 ) Loss from discontinued operations before income taxes (1.8 ) (31.9 ) (3.8 ) (66.2 ) Impairment of long-lived assets — — — (73.4 ) Income tax benefit — 2.1 — 2.6 Loss from discontinued operations, net of tax $ (1.8 ) $ (29.8 ) $ (3.8 ) $ (137.0 )
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities	Recorded Assets and Liabilities (In Millions) Assets and Liabilities of Discontinued Operations (1) September 30, December 31, Other current assets $ — $ 14.9 Total assets of discontinued operations $ — $ 14.9 Accrued liabilities $ 1.2 $ — Other current liabilities (1) 4.3 6.9 Total liabilities of discontinued operations $ 5.5 $ 6.9 (1) At September 30, 2016 and December 31, 2015, we had $4.0 million and $7.8 million, respectively, of contingent liabilities associated with our exit from the coal business recorded on our parent company.
Canadian Entities [Member]
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]
Schedule of Disposal Groups, including Discontinued Operations, Income Statement	Loss) on Discontinued Operations Our decision in 2015 to exit Canada represented a strategic shift in our business. For this reason, our previously reported Eastern Canadian Iron Ore and Ferroalloys operating segment results for all periods prior to the respective 2015 deconsolidations as well as costs to exit are classified as discontinued operations. (In Millions) Three Months Ended Nine Months Ended September 30, Gain (Loss) from Discontinued Operations 2016 2015 2016 2015 Revenues from product sales and services $ — $ — $ — $ 11.3 Cost of goods sold and operating expenses — — — (11.1 ) Sales margin — — — 0.2 Other operating expense — — — (33.8 ) Other expense — — — (1.0 ) Loss from discontinued operations before income taxes — — — (34.6 ) Gain (loss) from deconsolidation (0.9 ) (13.4 ) 3.2 (697.4 ) Income tax expense — (0.7 ) — — Gain (loss) from discontinued operations, net of tax $ (0.9 ) $ (14.1 ) $ 3.2 $ (732.0 )
PreTax Exit Costs	Canadian Entities loss from deconsolidation totaled $0.9 million and gain from deconsolidation totaled $3.2 million for the three and nine months ended September 30, 2016 , respectively, which included the following: (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Investment impairment on deconsolidation 1 $ (0.9 ) $ (13.9 ) $ 3.2 $ (494.3 ) Contingent liabilities — 0.5 — (203.1 ) Total gain (loss) from deconsolidation $ (0.9 ) $ (13.4 ) $ 3.2 $ (697.4 ) 1 Includes the adjustment to fair value of our remaining interest in the Canadian Entities.
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis	Items Measured at Fair Value on a Non-Recurring Basis The following table presents information about the financial assets and liabilities that were measured on a fair value basis at September 30, 2016 for the Canadian Operations. The table also indicates the fair value hierarchy of the valuation techniques used to determine such fair value. (In Millions) September 30, 2016 Description Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Total Gains Assets: Loans to and accounts receivables from the Canadian Entities $ — $ — $ 69.3 $ 69.3 $ 3.2 Liabilities: Contingent liabilities $ — $ — $ 38.1 $ 38.1 $ —

SHAREHOLDERS' EQUITY Shareholde

SHAREHOLDERS' EQUITY Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Schedule of Stockholders Equity	The following table reflects the changes in shareholders' equity (deficit) attributable to both Cliffs and the noncontrolling interests primarily related to Tilden and Empire of which Cliffs owns 85 percent and 79 percent , respectively, for the nine months ended September 30, 2016 and September 30, 2015 : (In Millions) Cliffs Shareholders’ Equity (Deficit) Noncontrolling Interest (Deficit) Total Equity (Deficit) December 31, 2015 $ (1,981.4 ) $ 169.8 $ (1,811.6 ) Comprehensive income Net income 95.0 23.5 118.5 Other comprehensive income 16.8 2.2 19.0 Total comprehensive income 111.8 25.7 137.5 Issuance of common shares 315.2 — 315.2 Stock and other incentive plans 10.1 — 10.1 Distributions of partnership equity — (48.8 ) (48.8 ) Undistributed losses to noncontrolling interest — (2.9 ) (2.9 ) September 30, 2016 $ (1,544.3 ) $ 143.8 $ (1,400.5 ) (In Millions) Cliffs Noncontrolling Total Equity (Deficit) December 31, 2014 $ (1,431.3 ) $ (303.0 ) $ (1,734.3 ) Comprehensive income (loss) Net loss (689.0 ) (1.5 ) (690.5 ) Other comprehensive income (loss) 220.7 (9.3 ) 211.4 Total comprehensive loss (468.3 ) (10.8 ) (479.1 ) Effect of deconsolidation — 528.2 528.2 Stock and other incentive plans 6.0 — 6.0 Preferred share dividends (38.4 ) — (38.4 ) Distributions to noncontrolling interest — (40.7 ) (40.7 ) Undistributed losses to noncontrolling interest — (1.2 ) (1.2 ) September 30, 2015 $ (1,932.0 ) $ 172.5 $ (1,759.5 )
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table reflects the changes in Accumulated other comprehensive income (loss) related to Cliffs shareholders’ equity for September 30, 2016 and September 30, 2015 : (In Millions) Changes in Pension and Other Post-Retirement Benefits, net of tax Unrealized Net Gain (Loss) on Securities, net of tax Unrealized Net Gain (Loss) on Foreign Currency Translation Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax Accumulated Other Comprehensive Income (Loss) Balance December 31, 2015 $ (241.4 ) $ 0.1 $ 220.7 $ 2.6 $ (18.0 ) Other comprehensive income (loss) before reclassifications (1.5 ) (0.1 ) 4.4 (3.4 ) (0.6 ) Net loss reclassified from accumulated other comprehensive income (loss) 6.3 — — — 6.3 Balance March 31, 2016 $ (236.6 ) $ — $ 225.1 $ (0.8 ) $ (12.3 ) Other comprehensive income (loss) before reclassifications (0.4 ) — (2.7 ) 0.1 (3.0 ) Net loss reclassified from accumulated other comprehensive income (loss) 6.3 — — — 6.3 Balance June 30, 2016 $ (230.7 ) $ — $ 222.4 $ (0.7 ) $ (9.0 ) Other comprehensive income (loss) before reclassifications (0.5 ) — 0.9 — 0.4 Net loss reclassified from accumulated other comprehensive income (loss) 6.7 — — 0.7 7.4 Balance September 30, 2016 $ (224.5 ) $ — $ 223.3 $ — $ (1.2 ) (In Millions) Changes in Pension and Other Post-Retirement Benefits, net of tax Unrealized Net Gain (Loss) on Securities, net of tax Unrealized Net Gain (Loss) on Foreign Currency Translation Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax Accumulated Other Comprehensive Income (Loss) Balance December 31, 2014 $ (291.1 ) $ (1.0 ) $ 64.4 $ (18.1 ) $ (245.8 ) Other comprehensive income (loss) before reclassifications 9.3 2.8 (14.7 ) (7.1 ) (9.7 ) Net loss (gain) reclassified from accumulated other comprehensive income (loss) 30.3 (2.0 ) 182.7 6.3 217.3 Balance March 31, 2015 $ (251.5 ) $ (0.2 ) $ 232.4 $ (18.9 ) $ (38.2 ) Other comprehensive income (loss) before reclassifications 1.3 1.0 1.2 0.5 4.0 Net loss (gain) reclassified from accumulated other comprehensive income (loss) (1.6 ) (0.9 ) — 7.8 5.3 Balance June 30, 2015 $ (251.8 ) $ (0.1 ) $ 233.6 $ (10.6 ) $ (28.9 ) Other comprehensive income (loss) before reclassifications (0.7 ) 0.1 (11.4 ) 4.8 (7.2 ) Net loss reclassified from accumulated other comprehensive income (loss) 6.6 — — 4.4 11.0 Balance September 30, 2015 $ (245.9 ) $ — $ 222.2 $ (1.4 ) $ (25.1 )
Details of Accumulated Other Comprehensive Income (Loss) Components	The following table reflects the details about Accumulated other comprehensive income (loss) components related to Cliffs shareholders’ equity for the three and nine months ended September 30, 2016 : (In Millions) Details about Accumulated Other Comprehensive Income (Loss) Components Amount of (Gain)/Loss Reclassified into Income Affected Line Item in the Statement of Unaudited Condensed Consolidated Operations Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Amortization of pension and postretirement benefit liability: Prior service costs (1) $ (0.4 ) $ 1.1 $ (1.2 ) $ 0.5 Net actuarial loss (1) 7.1 5.6 20.4 19.5 Settlements/curtailments (1) — (0.1 ) — 0.2 Effect of deconsolidation (2) — — — 15.1 Loss from Discontinued Operations, net of tax 6.7 6.6 19.2 35.3 Total before taxes — — — — Income tax benefit (expense) $ 6.7 $ 6.6 $ 19.2 $ 35.3 Net of taxes Unrealized gain (loss) on marketable securities: Impairment — — — (3.2 ) Other non-operating income (expense) — — — 0.3 Income tax benefit (expense) $ — $ — $ — $ (2.9 ) Net of taxes Unrealized gain (loss) on foreign currency translation: Effect of deconsolidation (2) $ — $ — $ — $ 182.7 Loss from Discontinued Operations, net of tax — — — — Income tax benefit (expense) $ — $ — $ — $ 182.7 Net of taxes Unrealized gain (loss) on derivative financial instruments: Australian dollar foreign exchange contracts $ — $ 6.3 $ — $ 26.4 Product revenues Treasury lock 1.2 — 1.2 — Gain (loss) on extinguishment/restructuring of debt (0.5 ) (1.9 ) (0.5 ) (7.9 ) Income tax benefit (expense) $ 0.7 $ 4.4 $ 0.7 $ 18.5 Net of taxes Total Reclassifications for the Period $ 7.4 $ 11.0 $ 19.9 $ 233.6 (1) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. See NOTE 7 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information. (2) Represents Canadian accumulated currency translation adjustments that were deconsolidated. See NOTE 14 - DISCONTINUED OPERATIONS for further information.

CASH FLOW INFORMATION (Tables)

CASH FLOW INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2016
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Disclosures	A reconciliation of capital additions to cash paid for capital expenditures for the nine months ended September 30, 2016 and 2015 is as follows: (In Millions) Nine Months Ended 2016 2015 Capital additions (1) $ 44.5 $ 69.0 Cash paid for capital expenditures 45.8 57.9 Difference $ (1.3 ) $ 11.1 Non-cash accruals $ (1.3 ) $ 10.4 Capital leases — 0.7 Total $ (1.3 ) $ 11.1 (1) Includes capital additions of $44.5 million related to continuing operations for the nine months ended September 30, 2016 . Includes capital additions of $46.6 million and $22.4 million related to continuing operations and discontinued operations, respectively, for the nine months ended September 30, 2015 .

RELATED PARTIES (Tables)

RELATED PARTIES (Tables)	9 Months Ended
	Sep. 30, 2016
Related Party Transactions [Abstract]
Summary Of Other Ownership Interests	The following is a summary of the mine ownership of these iron ore mines at September 30, 2016 : Mine Cliffs Natural Resources ArcelorMittal U.S. Steel Corporation Empire 79.0 % 21.0 % — Tilden 85.0 % — 15.0 % Hibbing 23.0 % 62.3 % 14.7 %
Summary Of Related Party Transactions Table Disclosure	Product revenues from related parties were as follows: (In Millions) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Product revenues from related parties $ 223.4 $ 208.0 $ 568.4 $ 468.0 Total product revenues 508.6 542.5 1,237.0 1,399.9 Related party product revenue as a percent of total product revenue 43.9 % 38.3 % 45.9 % 33.4 %

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share Computation	The following table summarizes the computation of basic and diluted earnings (loss) per share: (In Millions, Except Per Share Amounts) Three Months Ended Nine Months Ended 2016 2015 2016 2015 Income (Loss) from Continuing Operations $ (25.1 ) $ 49.9 $ 119.1 $ 178.5 Loss (Income) from Continuing Operations Attributable to Noncontrolling Interest 2.0 4.6 (23.5 ) (6.2 ) Net Income (Loss) from Continuing Operations Attributable to Cliffs Shareholders $ (23.1 ) $ 54.5 $ 95.6 $ 172.3 Loss from Discontinued Operations, net of tax (2.7 ) (43.9 ) (0.6 ) (861.3 ) Net Income (Loss) Attributable to Cliffs Shareholders $ (25.8 ) $ 10.6 $ 95.0 $ (689.0 ) Preferred Stock Dividends — (25.6 ) — (38.4 ) Net Income (Loss) Attributable to Cliffs Common Shareholders $ (25.8 ) $ (15.0 ) $ 95.0 $ (727.4 ) Weighted Average Number of Shares: Basic 206.3 153.2 186.5 153.2 Employee Stock Plans — — 2.0 — Diluted 206.3 153.2 188.5 153.2 Earnings (Loss) per Common Share Attributable to Continuing operations $ (0.11 ) $ 0.19 $ 0.51 $ 0.87 Discontinued operations (0.01 ) (0.29 ) — (5.62 ) $ (0.12 ) $ (0.10 ) $ 0.51 $ (4.75 ) Earnings (Loss) per Common Share Attributable to Continuing operations $ (0.11 ) $ 0.19 $ 0.51 $ 0.87 Discontinued operations (0.01 ) (0.29 ) — (5.62 ) $ (0.12 ) $ (0.10 ) $ 0.51 $ (4.75 )

BASIS OF PRESENTATION AND SIG46

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)Facility
Transaction Gains and Losses Resulting from Remeasurement [Member]
Related Party Transaction [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ (0.3)	$ 2.4	$ (1.2)	$ 15.2
Short-term intercompany loan [Member]
Related Party Transaction [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax		0.1		11.1
Cash and Cash Equivalents [Member]
Related Party Transaction [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	(1.1)	$ 1.3	0.3	$ 2
Liability [Member]
Related Party Transaction [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	0.6		(2)
Low Volatile Metallurgical Coal Mines [Member] | North American Coal [Member]
Related Party Transaction [Line Items]
Number of mines (in number of facilities) | Facility					2
Hibbing [Member] | Other Noncurrent Liabilities [Member]
Related Party Transaction [Line Items]
Equity Method Investments	$ (1.9)		$ (1.9)		$ (2.4)

BASIS OF PRESENTATION AND SIG47

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Subsidiaries) (Details)	9 Months Ended
	Sep. 30, 2016
Northshore [Member]
Related Party Transaction [Line Items]
Entity Address, State or Province	Minnesota
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Segment Reporting Information, Description of Products and Services	Iron Ore
United Taconite [Member]
Related Party Transaction [Line Items]
Entity Address, State or Province	Minnesota
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Segment Reporting Information, Description of Products and Services	Iron Ore
Tilden [Member]
Related Party Transaction [Line Items]
Entity Address, State or Province	Michigan
Noncontrolling Interest, Ownership Percentage by Parent	85.00%
Segment Reporting Information, Description of Products and Services	Iron Ore
Empire [Member]
Related Party Transaction [Line Items]
Entity Address, State or Province	Michigan
Noncontrolling Interest, Ownership Percentage by Parent	79.00%
Segment Reporting Information, Description of Products and Services	Iron Ore
Koolyanobbing [Member]
Related Party Transaction [Line Items]
Entity Address, State or Province	Western Australia
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Segment Reporting Information, Description of Products and Services	Iron Ore

BASIS OF PRESENTATION AND SIG48

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details) - Hibbing [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Other Noncurrent Liabilities [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ (1.9)	$ (2.4)
Other Noncurrent Assets [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest, equity method investment	23.00%

SEGMENT REPORTING (Schedule Of

SEGMENT REPORTING (Schedule Of Segment Reporting Information, By Segment) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenues from producet sales and services, percent		100.00%	100.00%	100.00%		100.00%
Revenues from product sales and services		$ 553.3	$ 593.2	$ 1,355		$ 1,537.3
Sales margin		85.4	55.1	207.8		193.2
Other operating expense		(50.7)	(25.9)	(98.7)		(66.4)
Other income (expense)		(66.9)	17.4	8.3		221.7
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		(32.2)	46.6	117.4		348.5
Net Income (Loss)		(27.8)	6	118.5		(690.5)
Interest expense, net		(48.7)	(62.3)	(156.2)		(170.7)
Income tax benefit (expense)		7.1	4.8	1.7		(167.3)
Depreciation, depletion and amortization		26.8	35.6	88.9		99.1
Gain (loss) on extinguishment/restructuring of debt		(18.3)	79.2	164.1		392.9
EBITDA		40.6	99.1	361.9		(253.4)
Adjusted EBITDA		61.9	60.1	199.7		217
Total depreciation, depletion and amortization						95.9
Property, Plant and Equipment, Additions	[1]	$ 26.4	$ 17.7	$ 44.5	[2]	$ 46.6
U.S. Iron Ore [Member]
Segment Reporting Information [Line Items]
Revenues from producet sales and services, percent		77.00%	79.00%	72.00%		75.00%
Revenues from product sales and services		$ 428.3	$ 471	$ 975.5		$ 1,152.5
Sales margin		66.5	48.7	149.7		177.7
Depreciation, depletion and amortization		18.8	27.9	65.1		71.6
EBITDA		61.1	69.2	196.6		239.6
Adjusted EBITDA		65.3	72.3	208.6		254.6
Property, Plant and Equipment, Additions	[1]	$ 25.8	$ 15	$ 39.5		$ 35.8
Asia Pacific Iron Ore [Member]
Segment Reporting Information [Line Items]
Revenues from producet sales and services, percent		23.00%	21.00%	28.00%		25.00%
Revenues from product sales and services		$ 125	$ 122.2	$ 379.5		$ 384.8
Sales margin		18.9	6.4	58.1		15.5
Depreciation, depletion and amortization		6.3	6.1	19.2		19.1
EBITDA		21.2	11.1	69.6		38.7
Adjusted EBITDA		23.7	9.7	73.2		32.8
Property, Plant and Equipment, Additions	[1]	0.2	0.3	0.2		4.8
All Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		1.7	1.6	4.6		5.2
EBITDA		(41.7)	18.8	95.7		(531.7)
Adjusted EBITDA		(27.1)	(21.9)	(82.1)		(70.4)
Property, Plant and Equipment, Additions	[1]	0.4	2.4	4.8		6
EBITDA Calculation [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		26.8	35.6	88.9		99.1
Adjusted EBITDA Calculation [Member]
Segment Reporting Information [Line Items]
Impairment of other long-lived assets		0	0	0		(3.3)
Impact of discontinued operations		(2.7)	(44.8)	(0.6)		(865.9)
Severance and contractor termination costs		0	2.2	(0.1)		(9.3)
Foreign exchange remeasurement		$ (0.3)	$ 2.4	$ (1.2)		$ 15.2
[1]	Includes capital lease additions and non-cash accruals. Refer to NOTE 17 - CASH FLOW INFORMATION.
[2]	Includes capital additions of $44.5 million related to continuing operations for the nine months ended September 30, 2016. Includes capital additions of $46.6 million and $22.4 million related to continuing operations and discontinued operations, respectively, for the nine months ended September 30, 2015.

SEGMENT REPORTING Segment Repor

SEGMENT REPORTING Segment Reporting (Summary of Assets by Segment) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 1,772.9	$ 2,135.5
U.S. Iron Ore [Member]
Segment Reporting Information [Line Items]
Assets	1,429	1,476.4
Asia Pacific Iron Ore [Member]
Segment Reporting Information [Line Items]
Assets	137.7	202.5
Total Segment Assets [Member]
Segment Reporting Information [Line Items]
Assets	1,566.7	1,678.9
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	206.2	441.7
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Assets of Discontinued Operations	$ 0	$ 14.9

INVENTORIES (Schedule Of Invent

INVENTORIES (Schedule Of Inventories) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventory, Net [Abstract]
Finished Goods	$ 266.1	$ 273.1
Work-in Process	51.2	56.5
Total Inventory	317.3	329.6
U.S. Iron Ore [Member]
Inventory, Net [Abstract]
Finished Goods	248.8	252.3
Work-in Process	20.4	11.7
Total Inventory	269.2	264
Asia Pacific Iron Ore [Member]
Inventory, Net [Abstract]
Finished Goods	17.3	20.8
Work-in Process	30.8	44.8
Total Inventory	$ 48.1	$ 65.6

PROPERTY, PLANT AND EQUIPMENT52

PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Depreciation and depletion	$ 25.6	$ 34.6	$ 85.1	$ 92.8

PROPERTY, PLANT AND EQUIPMENT53

PROPERTY, PLANT AND EQUIPMENT (Value Of Each Of The Major Classes Of Consolidated Depreciable Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,924.1	$ 1,970.3
Allowance for depreciation and depletion	(934)	(911.3)
Property, plant and equipment, net	990.1	1,059
Land Rights And Mineral Rights [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	500.5	500.5
Office And Information Technology [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	63.6	71
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	61.1	60.4
Mining Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	598.7	594
Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	541.2	516.8
Electric Power Facilities [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	49.6	46.4
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24.8	24.8
Asset Retirement Obligation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18.3	87.9
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28.4	28.2
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 37.9	$ 40.3

DEBT AND CREDIT FACILITIES (Nar

DEBT AND CREDIT FACILITIES (Narrative) (Details) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2016USD ($)		Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)		Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Line of Credit Facility [Line Items]
Payments of Debt Issuance Costs					$ 5.2		$ 33.6
Letters of credit outstanding		$ 108.8			108.8			$ 186.3
Gain (loss) on extinguishment/restructuring of debt		(18.3)		$ 79.2	164.1		$ 392.9
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, amount outstanding	[1]	0			0
Line of Credit Facility, Maximum Borrowing Capacity		355.7			355.7			366
Debt Instrument, Par Value		550	[1]		550	[1]		550	[2]
Credit facility remaining capacity		246.9			246.9			179.2
Letters of credit outstanding		$ 108.8			$ 108.8			$ 186.3
Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Base Rate					0.005
$218.5 Million 8.00% 2020 Lien Notes [Member]
Line of Credit Facility [Line Items]
Stated interest rate		8.00%			8.00%
Repurchase Price of $218.5M 8.00% Notes if Triggering Event Occurs					1.01
Initial Redemption Price					1.04
Debt Instrument, Par Value		$ 218.5			$ 218.5
Redemption Price after September 30, 2017					1
Redemption Price from time to time and prior to September 30, 2017					1
Amount in aggregate that can be redeemed on or prior to September 30, 2017					0.35
Redemption Price of 35 percent or less of Outstanding					1.08
Amount to Remain Outstanding Prior to September 30, 2017					0.65
$544 Million 7.75% 2020 Lien Notes[Member]
Line of Credit Facility [Line Items]
Stated interest rate		7.75%			7.75%
$540 Million 8.25% 2020 Lien Notes [Member]
Line of Credit Facility [Line Items]
Stated interest rate		8.25%			8.25%
In the Event of Default Amount that will Accelerate					0.25
Senior Notes Five Hundred Million 3.95% [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Par Value		$ 283.6			$ 283.6
Debt Redemption Expenses		2.5
Debt Instrument, Repurchase Amount		301			301
Amortization of Debt Discount (Premium)		$ 17.4
Gain (loss) on extinguishment/restructuring of debt					19.9
Exchange of Debt [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member]
Line of Credit Facility [Line Items]
Gain (loss) on extinguishment/restructuring of debt					$ 174.3
[1]	As of September 30, 2016, no loans were drawn under the ABL Facility and we had total availability of $355.7 million as a result of borrowing base limitations. As of September 30, 2016, the principal amount of letter of credit obligations totaled $108.8 million, thereby further reducing available borrowing capacity on our ABL Facility to $246.9 million.
[2]	As of December 31, 2015, no loans were drawn under the ABL Facility and we had total availability of $366.0 million as a result of borrowing base limitations. As of December 31, 2015, the principal amount of letter of credit obligations totaled $186.3 million and commodity hedge obligations totaled $0.5 million, thereby further reducing available borrowing capacity on our ABL Facility to $179.2 million.

DEBT AND CREDIT FACILITIES (Sch

DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes					$ 10
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes		$ 4.5		$ 12.6
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes		10.5
Total Face Amount		2,833.1				$ 3,448.2
Letters of credit outstanding		108.8				186.3
Long-term Debt		2,195.9				2,699.4
Debt, Long-term and Short-term, Combined Amount		2,213.4
Long-term Debt, Current Maturities		$ 17.5
$700 Million 4.875% 2021 Senior Note [Member]
Debt Instrument [Line Items]
Stated interest rate		4.875%
Debt Instrument, Face Amount Exchanged		$ 76.3
Total Face Amount		325.7	[1]			412.5
Unamortized Debt Issuance Expense		(1.2)	[1]			(1.7)
Long-term Debt		324.3	[1]			410.6
Debt Instrument, Unamortized Discount		$ (0.2)	[1]			$ (0.2)
Imputed interest rate		4.89%	[1]			4.89%
$500 million 4.80% 2020 Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		4.80%
Debt Instrument, Face Amount Exchanged		$ 44.7
Total Face Amount		244.8	[2]			$ 306.7
Unamortized Debt Issuance Expense		(0.7)	[2]			(1.1)
Long-term Debt		243.9	[2]			305.2
Debt Instrument, Unamortized Discount		$ (0.2)	[2]			$ (0.4)
Imputed interest rate		4.83%	[2]			4.83%
$800 Million 6.25% 2040 Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		6.25%
Debt Instrument, Face Amount Exchanged		$ 194.4
Total Face Amount		298.4	[3]			$ 492.8
Unamortized Debt Issuance Expense		(2.5)	[3]			(4.3)
Long-term Debt		292.5	[3]			482.7
Debt Instrument, Unamortized Discount		$ (3.4)	[3]			$ (5.8)
Imputed interest rate		6.34%	[3]			6.34%
$400 Million 5.90% 2020 Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		5.90%
Debt Instrument, Face Amount Exchanged		$ 65.1
Total Face Amount		225.6	[4]			$ 290.8
Unamortized Debt Issuance Expense		(0.7)	[4]			(1.1)
Long-term Debt		224.4	[4]			288.9
Debt Instrument, Unamortized Discount		$ (0.5)	[4]			$ (0.8)
Imputed interest rate		5.98%	[4]			5.98%
$500 Million 3.95% 2018 Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		3.95%
Debt Instrument, Face Amount Exchanged		$ 17.6
Total Face Amount		0	[5]			$ 311.2
Unamortized Debt Issuance Expense		0	[5]			(0.9)
Long-term Debt		0	[5]			309.1
Debt Instrument, Unamortized Discount		$ 0	[5]			$ (1.2)
Imputed interest rate		6.15%	[5]			6.30%
$540 Million 8.25% 2020 Lien Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		8.25%
Total Face Amount		$ 540				$ 540
Unamortized Debt Issuance Expense		(8.6)				(10.5)
Long-term Debt		504				497.4
Debt Instrument, Unamortized Discount		$ (27.4)				$ (32.1)
Imputed interest rate		9.97%				9.97%
$218.5 Million 8.00% 2020 Lien Notes [Member]
Debt Instrument [Line Items]
Stated interest rate		8.00%
Debt Instrument, Carrying Amount Received in Debt Exchange of $544.2M 7.75% Notes		$ 77.5
Debt Instrument, Face Amount Received in Debt Exchange of $544M 7.75% Notes		57
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes		11.4
Debt Instrument, Carrying Amount Received in Debt Exchange of $500M 3.95% Notes		15.5
Debt Instrument, Carrying Amount Received in Debt Exchange of $400M 5.90% Notes		35.4
Debt Instrument, Carrying Value Received in Debt Exchange of $800M 6.25% Notes		103
Debt Instrument, Carrying Value Received in Debt Exchange of $500M 4.80% Notes		24.4
Debt instrument, Carrying Value Received in Debt Exchange of $700M 4.875% Notes		41.5
Debt Instrument, Face Amount Received in Debt Exchange of $400M 5.90% Notes		26
Debt Instrument, Face Amount Received in Debt Exchange of $800M 6.25% Notes		75.8
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes		17.9
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes		30.5
Total Face Amount	[6]	218.5
Debt Instrument, Par Value		218.5
Unamortized Debt Issuance Expense	[6]	0
Undiscounted interest	[6]	70
Long-term Debt	[6]	$ 288.5
$544 Million 7.75% 2020 Lien Notes[Member]
Debt Instrument [Line Items]
Stated interest rate		7.75%
Debt Instrument, Face Amount Exchanged		$ 114.1
Total Face Amount		430.1	[7]			$ 544.2
Unamortized Debt Issuance Expense		(6.2)	[7]			(9.5)
Long-term Debt		333.8	[7]			403.2
Debt Instrument, Unamortized Discount		$ (90.1)	[7]			$ (131.5)
Imputed interest rate		15.55%	[7]			15.55%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Par Value		$ 550	[8]			$ 550	[9]
Credit facility, amount outstanding	[8]	0
Line of Credit Facility, Maximum Borrowing Capacity		355.7				366
Letters of credit outstanding		108.8				186.3
Credit facility remaining capacity		246.9				179.2
Hedge Obligations [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding						0.5
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Fair Value Adjustment to Interest Rate Hedge		$ 2				$ 2.3
[1]	n March 2, 2016, we exchanged as part of an exchange offer $76.3 million of the 4.875 percent senior notes for $30.5 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $41.5 million, including undiscounted interest payments
[2]	On March 2, 2016, we exchanged as part of an exchange offer $44.7 million of the 4.80 percent senior notes for $17.9 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $24.4 million, including undiscounted interest payments as of the transaction date. Additionally, during the second and third quarters of 2016 we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction.
[3]	On March 2, 2016, we exchanged as part of an exchange offer $194.4 million of the 6.25 percent senior notes for $75.8 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $103.0 million, including undiscounted interest payments as of the transaction date.
[4]	On March 2, 2016, we exchanged as part of an exchange offer $65.1 million of the 5.90 percent senior notes for $26.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $35.4 million, including undiscounted interest payments as of the transaction date.
[5]	On March 2, 2016, we exchanged as part of an exchange offer $17.6 million of the 3.95 percent senior notes for $11.4 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $15.5 million, including undiscounted interest payments as of the transaction date. Additionally, during the first quarter of 2016, we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction.
[6]	See the section entitled "$218.5 million 8.00 percent 2020 Senior Secured 1.5 Lien Notes - 2016 Exchange Offers" below for further discussion related to this instrument.
[7]	On March 2, 2016, we exchanged as part of an exchange offer $114.1 million of the 7.75 percent senior notes for $57.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $77.5 million, including undiscounted interest payments as of the transaction date.
[8]	As of September 30, 2016, no loans were drawn under the ABL Facility and we had total availability of $355.7 million as a result of borrowing base limitations. As of September 30, 2016, the principal amount of letter of credit obligations totaled $108.8 million, thereby further reducing available borrowing capacity on our ABL Facility to $246.9 million.
[9]	As of December 31, 2015, no loans were drawn under the ABL Facility and we had total availability of $366.0 million as a result of borrowing base limitations. As of December 31, 2015, the principal amount of letter of credit obligations totaled $186.3 million and commodity hedge obligations totaled $0.5 million, thereby further reducing available borrowing capacity on our ABL Facility to $179.2 million.

DEBT AND CREDIT FACILITIES DEBT

DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Schedule of Debt Maturities) (Details) $ in Millions	Sep. 30, 2016USD ($)
Debt Disclosure [Abstract]
2016 (October 1 - December 31)	$ 0
Debt Maturities 2017	0
Debt Maturities 2018	0
Debt Maturities 2019	0
Debt Maturities 2020	1,659
Debt Maturities 2021	325.7
2022 and thereafter	298.4
Total maturities of debt	$ 2,283.1

FAIR VALUE MEASUREMENTS (Narrat

FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets And Liabilities Components [Line Items]
Management Estimate of 62% Fe	62.00%
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Components [Line Items]
Cash equivalents	$ 0	$ 30

FAIR VALUE MEASUREMENTS (Fair V

FAIR VALUE MEASUREMENTS (Fair Value Of Assets And Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]
Assets:
Cash equivalents	$ 0	$ 30

FAIR VALUE MEASUREMENTS (Schedu

FAIR VALUE MEASUREMENTS (Schedule Of Quantitative Inputs And Assumptions For Level 3 Assets And Liabilities) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management Estimate of 62% Fe	62.00%
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value	$ 28,400,000	$ 7,800,000
Derivative liability, fair value	$ 2,700,000	4,000,000
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Managements Estimate Of 62% Fee [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management Estimate of 62% Fe	62.00%
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Provisional Pricing Arrangements [Member] | Managements Estimate Of 62% Fee [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement with unobservable inputs derivative asset range	$ 56
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Customer Supply Agreement [Member] | Hot-Rolled Steel Estimate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement with unobservable inputs derivative asset range	470
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Customer Supply Agreement [Member] | Hot-Rolled Steel Estimate [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement with unobservable inputs derivative asset range	430
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Customer Supply Agreement [Member] | Hot-Rolled Steel Estimate [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement with unobservable inputs derivative asset range	530
Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Provisional Pricing Arrangements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value	400,000	2,000,000
Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Customer Supply Agreement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value	28,000,000	5,800,000
Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value	0	0
Other Current Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Provisional Pricing Arrangements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, fair value	2,700,000	3,400,000
Other Current Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Market Approach Valuation Technique [Member] | Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, fair value	$ 0	$ 600,000

FAIR VALUE MEASUREMENTS (Fair60

FAIR VALUE MEASUREMENTS (Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance - January 1	$ 25.8	$ 7.7	$ 7.8	$ 63.2
Total gains (losses)
Included in earnings	14.6	15	62.6	28.1
Settlements	(12)	(12.3)	(42)	(80.9)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending balance - September 30	28.4	10.4	28.4	10.4
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date	8.2	12.2	24.7	22.7
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance - January 1	(2.6)	(8)	(3.4)	(9.5)
Total gains (losses)
Included in earnings	(2.9)	(13.7)	(12.8)	(45.4)
Settlements	2.8	20.9	13.5	54.1
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending balance - September 30	(2.7)	(0.8)	(2.7)	(0.8)
Total losses for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date	$ (2.7)	$ (0.5)	$ (2.7)	$ (0.8)

FAIR VALUE MEASUREMENTS (Carryi

FAIR VALUE MEASUREMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) - USD ($)		Sep. 30, 2016		Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		$ 2,833,100,000		$ 3,448,200,000
$700 Million 4.875% 2021 Senior Note [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		325,700,000	[1]	412,500,000
$400 Million 5.90% 2020 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		225,600,000	[2]	290,800,000
$500 Million 3.95% 2018 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		0	[3]	311,200,000
$540 Million 8.25% 2020 Lien Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		540,000,000		540,000,000
$218.5 Million 8.00% 2020 Lien Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	[4]	218,500,000
$544 Million 7.75% 2020 Lien Notes[Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		430,100,000	[5]	544,200,000
Interest Rate Swap [Member]
Long-term debt:
Fair Value Adjustment to Interest Rate Hedge		2,000,000		2,300,000
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member]
Long-term debt:
Total long-term debt, fair value		2,213,400,000		2,699,400,000
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Long-term debt:
Fair Value Adjustment to Interest Rate Hedge		2,000,000		2,300,000
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
Long-term debt:
Total long-term debt, fair value		2,045,100,000		898,200,000
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Long-term debt:
Fair Value Adjustment to Interest Rate Hedge		2,000,000		2,300,000
Senior Notes [Member] | $700 Million 4.875% 2021 Senior Note [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		700,000,000		700,000,000
Senior Notes [Member] | Senior Notes One Point Three Billion [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		1,300,000,000		1,300,000,000
Senior Notes [Member] | $400 Million 5.90% 2020 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		400,000,000		400,000,000
Senior Notes [Member] | $500 Million 3.95% 2018 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		500,000,000		500,000,000
Senior Notes [Member] | $540 Million 8.25% 2020 Lien Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		540,000,000
Senior Notes [Member] | $544 Million 7.75% 2020 Lien Notes[Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value		544,200,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Note [Member]
Long-term debt:
Total long-term debt, fair value		324,300,000		410,600,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes One Point Three Billion [Member]
Long-term debt:
Total long-term debt, fair value		536,400,000		787,900,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value		224,400,000		288,900,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $500 Million 3.95% 2018 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value		0		309,100,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $540 Million 8.25% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value		504,000,000		497,400,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $544 Million 7.75% 2020 Lien Notes[Member]
Long-term debt:
Total long-term debt, fair value		333,800,000		403,200,000
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | Revolving Credit Facility [Member]
Long-term debt:
Total long-term debt, fair value	[6]			0
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value		288,500,000		0
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Note [Member]
Long-term debt:
Total long-term debt, fair value		260,600,000		69,400,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes One Point Three Billion [Member]
Long-term debt:
Total long-term debt, fair value		400,700,000		137,400,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value		194,900,000		52,800,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $500 Million 3.95% 2018 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value		0		87,100,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $540 Million 8.25% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value		573,200,000		414,500,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $544 Million 7.75% 2020 Lien Notes[Member]
Long-term debt:
Total long-term debt, fair value		402,800,000		134,700,000
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value		210,900,000		0
Line of Credit [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
Long-term debt:
Total long-term debt, fair value		0		0
Line of Credit [Member] | Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
Long-term debt:
Total long-term debt, fair value		$ 0		$ 0
[1]	n March 2, 2016, we exchanged as part of an exchange offer $76.3 million of the 4.875 percent senior notes for $30.5 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $41.5 million, including undiscounted interest payments
[2]	On March 2, 2016, we exchanged as part of an exchange offer $65.1 million of the 5.90 percent senior notes for $26.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $35.4 million, including undiscounted interest payments as of the transaction date.
[3]	On March 2, 2016, we exchanged as part of an exchange offer $17.6 million of the 3.95 percent senior notes for $11.4 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $15.5 million, including undiscounted interest payments as of the transaction date. Additionally, during the first quarter of 2016, we entered into a debt for equity exchange; see NOTE 15 - CAPITAL STOCK for further discussion of this transaction.
[4]	See the section entitled "$218.5 million 8.00 percent 2020 Senior Secured 1.5 Lien Notes - 2016 Exchange Offers" below for further discussion related to this instrument.
[5]	On March 2, 2016, we exchanged as part of an exchange offer $114.1 million of the 7.75 percent senior notes for $57.0 million of the 8.00 percent 1.5 lien notes that were recorded at a carrying value of $77.5 million, including undiscounted interest payments as of the transaction date.
[6]	As of December 31, 2015, no loans were drawn under the ABL Facility and we had total availability of $366.0 million as a result of borrowing base limitations. As of December 31, 2015, the principal amount of letter of credit obligations totaled $186.3 million and commodity hedge obligations totaled $0.5 million, thereby further reducing available borrowing capacity on our ABL Facility to $179.2 million.

PENSIONS AND OTHER POSTRETIRE62

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
Pension Plans, Defined Benefit [Member]
Definted Benefit Plan Disclosure [Line Items]
Reduction in other postretirement benefit expense	$ (1.9)		$ (6.1)
Total service and interest costs for other post retirement benefit plans	12		35.9
Pension Contributions	0.5	$ 23.9	0.7	$ 34.1
Other Postretirement Benefit Plans, Defined Benefit [Member]
Definted Benefit Plan Disclosure [Line Items]
Reduction in other postretirement benefit expense	(0.2)		(1.4)
Total service and interest costs for other post retirement benefit plans	2.7		8.1
Other Postretirement Benefit Expense	$ 0	$ 0	$ 0	$ 0
Scenario, Forecast [Member] | Pension Plans, Defined Benefit [Member]
Definted Benefit Plan Disclosure [Line Items]
Reduction in net periodic benefit expense					$ 8.2
Reduction in other postretirement benefit expense					$ 1.8

PENSIONS AND OTHER POSTRETIRE63

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Estimated Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4.2	$ 3.1	$ 13.2	$ 15.7
Interest cost	7.8	9	22.7	27.9
Expected return on plan assets	(13.6)	(14.5)	(41)	(44.4)
Prior service credits	0.5	0.5	1.6	1.7
Net actuarial loss	5.4	4.5	15.9	15.3
Curtailments/settlements	0	(0.1)	0	0.2
Net periodic benefit credit to continuing operations	4.3	2.5	12.4	16.4
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.4	(1.6)	1.3	1.4
Interest cost	2.3	2.1	6.8	8.6
Expected return on plan assets	(4.3)	(4.5)	(12.8)	(13.7)
Prior service credits	(0.9)	0.6	(2.8)	(1.2)
Net actuarial loss	1.7	1.1	4.5	4.2
Net periodic benefit credit to continuing operations	$ (0.8)	$ (2.3)	$ (3)	$ (0.7)

STOCK COMPENSATION PLANS (Narra

STOCK COMPENSATION PLANS (Narrative) (Details) shares in Millions	9 Months Ended
	Sep. 30, 2016shares
Restricted Stock Units (RSUs) [Member] | 2015 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted	3.4

INCOME TAXES (Narrative) (Detai

INCOME TAXES (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent			0.40%	2.10%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Discrete Tax Items	$ 2.9	$ 4.5	$ 2.2	$ 162.6

LEASE OBLIGATIONS (Narrative) (

LEASE OBLIGATIONS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Leases [Abstract]
Operating lease expense	$ 2.2	$ 3.2	$ 6.8	$ 9.5

LEASE OBLIGATIONS (Future Minim

LEASE OBLIGATIONS (Future Minimum Lease Payments) (Details) $ in Millions	Sep. 30, 2016USD ($)
Capital Leases
2016 (October 1 - December 31)	$ 6.4
2,017	23.4
2,018	18.9
2,019	10.5
2,020	9.4
2021 and thereafter	9.4
Total minimum lease payments	78
Amounts representing interest	14.2
Present value of net minimum lease payments	63.8	[1]
Operating Leases
2016 (October 1 - December 31)	2.3
2,017	8.9
2,018	7.6
2,019	4.9
2,020	4.9
2021 and thereafter	5
Total minimum lease payments	33.6
Other Current Liabilities [Member]
Capital Leases
Present value of net minimum lease payments	18.3
Other Liabilities [Member]
Capital Leases
Present value of net minimum lease payments	$ 45.5
[1]	The total is comprised of $18.3 million and $45.5 million classified as Other current liabilities and Other liabilities, respectively, in the Statements of Unaudited Condensed Consolidated Financial Position at September 30, 2016.

ENVIRONMENTAL AND MINE CLOSUR68

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Environmental	$ 3	$ 3.6
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current	2.6	2.8
Environmental Loss Contingency And Mine Reclamation And Closing Liability Noncurrent	220.2	231.2
U.S. Iron Ore [Member] | Owned Or Operating Facilities [Member]
Loss Contingencies [Line Items]
Mine Reclamation and Closing Liability, current and noncurrent	176.8	189.9
Asia Pacific Iron Ore [Member] | Owned Or Operating Facilities [Member]
Loss Contingencies [Line Items]
Mine Reclamation and Closing Liability, current and noncurrent	18	16.4
North American Coal [Member] | Owned Or Operating Facilities [Member]
Loss Contingencies [Line Items]
Mine Reclamation and Closing Liability, current and noncurrent	219.8	230.4
Eastern Canadian Iron Ore [Member] | Owned Or Operating Facilities [Member]
Loss Contingencies [Line Items]
Mine Reclamation and Closing Liability, current and noncurrent	222.8	234
LTV Steel Mining Company [Member] | Previously Owned Or Operating Facilities [Member]
Loss Contingencies [Line Items]
Mine Reclamation and Closing Liability, current and noncurrent	$ 25	$ 24.1

ENVIRONMENTAL AND MINE CLOSUR69

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Asset Retirement Obligation Disclosure) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Asset Retirement Obligation [Roll Forward]
Asset retirement obligation at beginning of period	$ 206.3	$ 142.4
Accretion expense	8.4	6.5
Exchange rate changes	0.9	(1.1)
Revision in estimated cash flows	(20.8)	58.5
Asset retirement obligation at end of period	$ 194.8	$ 206.3

GOODWILL AND OTHER INTANGIBLE70

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
Goodwill [Line Items]
Product	$ 508.6	$ 542.5	$ 1,237	$ 1,399.9
Cost of Sales [Member]
Goodwill [Line Items]
Amortization expense relating to intangible assets	1.2	0.9	3.8	3.1
Sales Revenue, Goods, Net [Member] | Sales Revenue, Goods, Net [Member]
Goodwill [Line Items]
Product	7.7	$ 7.7	15.4	$ 15.4
U.S. Iron Ore [Member]
Goodwill [Line Items]
Goodwill	$ 2		$ 2
Scenario, Forecast [Member]
Goodwill [Line Items]
Future Below Market Sales Contracts Revenue Year One					$ 7.7

GOODWILL AND OTHER INTANGIBLE71

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Schedule Of Finite-Lived Intangible Assets By Major Class) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Definite lived intangible assets - Gross Carrying Amount	$ 78.7	$ 78.4
Definite lived intangible assets - Accumulated Amortization	(23.8)	(20.2)
Definite lived intangible assets - Net Carrying Amount	54.9	58.2
Permits [Member] | Other Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Definite lived intangible assets - Gross Carrying Amount	78.7	78.4
Definite lived intangible assets - Accumulated Amortization	(23.8)	(20.2)
Definite lived intangible assets - Net Carrying Amount	54.9	58.2
Below Market Sales Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Below Market Lease, Gross	(228.9)	(228.9)
Below Market Lease, Accumulated Amortization	221.2	205.8
Below Market Lease, Net	(7.7)	(23.1)
Below Market Sales Contracts [Member] | Other Current Liabilities [Member]
Finite-Lived Intangible Assets [Line Items]
Below Market Lease, Gross	(23.1)	(23.1)
Below Market Lease, Accumulated Amortization	15.4
Below Market Lease, Net	(7.7)	(23.1)
Below Market Sales Contracts [Member] | Other Liabilities [Member]
Finite-Lived Intangible Assets [Line Items]
Below Market Lease, Gross	(205.8)	(205.8)
Below Market Lease, Accumulated Amortization	205.8	205.8
Below Market Lease, Net	$ 0	$ 0

GOODWILL AND OTHER INTANGIBLE72

GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Estimated Amortization Expense Relating To Intangible Assets) (Details) $ in Millions	Sep. 30, 2016USD ($)
Estimated amortization expense, intangible assets [Abstract]
2016 (remaining six months)	$ 1
2,017	4.2
2,018	4.2
2,019	2.5
2,020	2.5
2,021	2.5
Total	$ 16.9

DERIVATIVE INSTRUMENTS (Narrati

DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 11.6	$ 16	$ 49.7	$ 3.1
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount					$ 0
Foreign Exchange Contract [Member] | Other Nonoperating Income (Expense) [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(1.1)	0	(3.6)
Foreign Exchange Contract [Member] | Product Revenues [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(2.1)	0	(11.8)
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Product Revenues [Member]
Derivative [Line Items]
Amount of gain/(loss) recognized in income on derivative	7.1	11.6	26.8	22.1
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Derivative assets	28		28		5.8
Provisional Pricing Arrangements [Member] | Product Revenues [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	4.5	7.6	22.9	(0.2)
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Product Revenues [Member]
Derivative [Line Items]
Amount of gain/(loss) recognized in income on derivative	4.5	$ 7.6	22.9	$ (0.2)
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Derivative assets	0.4		0.4		2
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | U S Iron Ore And Asia Pacific Iron Ore [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	$ 2.7		$ 2.7		$ 3.4

DERIVATIVE INSTRUMENTS (Schedul

DERIVATIVE INSTRUMENTS (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 28.4	$ 7.8
Derivative liability, fair value	2.7	4
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Customer Supply Agreement [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	28	5.8
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Customer Supply Agreement [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	0	0
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Provisional Pricing Arrangements [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	0.4	2
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2.7	3.4
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	0	0
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 0	$ 0.6

DERIVATIVE INSTRUMENTS (Sched75

DERIVATIVE INSTRUMENTS (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 11.6	$ 16	$ 49.7	$ 3.1
Foreign Exchange Contract [Member] | Product Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(2.1)	0	(11.8)
Foreign Exchange Contract [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(1.1)	0	(3.6)
Commodity Contract [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	0	0	(3.4)
Customer Supply Agreements [Member] | Product Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	7.1	11.6	26.8	22.1
Provisional Pricing Arrangements [Member] | Product Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 4.5	$ 7.6	$ 22.9	$ (0.2)

DISCONTINUED OPERATIONS DISCONT

DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS (Narrative) (Details) CAD in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016CAD	Mar. 08, 2016CAD	Dec. 31, 2015USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deconsolidation, Gain (Loss), Amount				$ 528.2
Loans to and accounts receivable from the Canadian Entities	$ 69.3		$ 69.3				$ 72.9
Guarantees	0.2		0.2				96.5
Sale amount for Pointe Noire port and rail assets | CAD						CAD 66,750
Sale Amount of the Bloom Lake Mine and Labrador Trough South mineral claims | CAD					CAD 10,500
Canadian Entities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation	0	$ (0.7)	0	0
Deconsolidation, Gain (Loss), Amount	(0.9)	(13.4)	3.2	(697.4)
Cost Method Investments	0		0
Contingent Liabilities of Deconsolidated Entities	0	0.5	0	(203.1)
Wabush [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debtor-in-Possession Financing, Amount Arranged	10		10
Debtor-in-Possession Financing, Borrowings Outstanding	0		0
North American Coal [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation	0	$ (2.1)	0	$ (2.6)
Other Current Assets [Member] | Canadian Entities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debtor-in-Possession Financing, Borrowings Outstanding	1.5		1.5				6.8
Debtor-in-possession,Repayment	8.3		8.3
Other Liabilities [Member] | Bloom Lake Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent Liabilities recognized in Consolidated Financials	$ 37.9		$ 37.9				$ 35.9

DISCONTINUED OPERATIONS Schedul

DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Income Statement, Balance Sheet and Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	$ (2.7)	$ (43.9)	$ (0.6)	$ (869)
Short-term assets of discontinued operations	0		0		$ 14.9
Short-term liabilities of discontinued operations	5.5		5.5		6.9
Depreciation, depletion and amortization	26.8	35.6	88.9	99.1
Payments to Acquire Property, Plant, and Equipment			45.8	57.9
Asset Impairment Charges, Cash Flows			0	76.6
North American Coal [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Liabilities	5.5		5.5		6.9
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	(1.8)	(29.8)	(3.8)	(137)
Short-term assets of discontinued operations	0		0		14.9
Short-term liabilities of discontinued operations					6.9
Depreciation, depletion and amortization				3.2
Payments to Acquire Property, Plant, and Equipment				13.1
Asset Impairment Charges, Cash Flows				73.4
Eastern Canadian Iron Ore [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	(0.9)	(14.1)	3.2	(731.9)
Short-term assets of discontinued operations	0		0		0
Short-term liabilities of discontinued operations	0		0		0
Depreciation, depletion and amortization				0
Payments to Acquire Property, Plant, and Equipment				0
Asset Impairment Charges, Cash Flows				0
Other Canadian Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	0	0	0	(0.1)
Short-term assets of discontinued operations	0		0		0
Short-term liabilities of discontinued operations	0		0		0
Depreciation, depletion and amortization				0
Payments to Acquire Property, Plant, and Equipment				0
Asset Impairment Charges, Cash Flows				0
Canadian Entities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	(0.9)	$ (14.1)	3.2	(732)
Short-term assets of discontinued operations	0		0		0
Short-term liabilities of discontinued operations	$ 0		$ 0		$ 0
Depreciation, depletion and amortization				0
Payments to Acquire Property, Plant, and Equipment				0
Asset Impairment Charges, Cash Flows				0
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation, depletion and amortization				3.2
Payments to Acquire Property, Plant, and Equipment				13.1
Asset Impairment Charges, Cash Flows				$ 73.4

DISCONTINUED OPERATIONS Sched78

DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Income Statement - North American Coal (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	$ (2.7)	$ (43.9)	$ (0.6)	$ (869)
North American Coal [Member]
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	0	78.8	0	338.1
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	(102.9)	0	(377.2)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)	0	(24.1)	0	(39.1)
Disposal Group, Including Discontinued Operation, Operating Expense	(1.8)	(7.4)	(3.8)	(25.7)
Disposal Group, Including Discontinued Operation, Other Expense	0	(0.4)	0	(1.4)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(1.8)	(31.9)	(3.8)	(66.2)
Impairment of Long-Lived Assets to be Disposed of	0	0	0	(73.4)
Discontinued Operation, Tax Effect of Discontinued Operation	0	2.1	0	2.6
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	$ (1.8)	$ (29.8)	$ (3.8)	$ (137)

DISCONTINUED OPERATIONS Sched79

DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities - North American Coal (Details) - North American Coal [Member] - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]
Disposal Group, Including Discontinued Operation, Other Assets, Current	$ 0	$ 14.9
Assets of Discontinued Operations	0	14.9
Disposal Group, Including Discontinued Operation, Accrued Liabilities	1.2	0
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	4.3	6.9
Disposal Group, Including Discontinued Operation, Liabilities	$ 5.5	$ 6.9

DISCONTINUED OPERATIONS Sched80

DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Income Statement - Canadian Entities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Disposal Groups, including Discontinued Operations, Income Statement [Line Items]
Deconsolidation, Gain (Loss), Amount				$ 528.2
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	$ (2.7)	$ (43.9)	$ (0.6)	(869)
Canadian Entities [Member]
Schedule of Disposal Groups, including Discontinued Operations, Income Statement [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	0	0	0	11.3
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	0	0	(11.1)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)	0	0	0	0.2
Disposal Group, Including Discontinued Operation, Operating Expense	0	0	0	(33.8)
Disposal Group, Including Discontinued Operation, Other Expense	0	0	0	(1)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	0	0	(34.6)
Deconsolidation, Gain (Loss), Amount	(0.9)	(13.4)	3.2	(697.4)
Discontinued Operation, Tax Effect of Discontinued Operation	0	0.7	0	0
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	(0.9)	(14.1)	3.2	(732)
Contingent Liabilities of Deconsolidated Entities	0	(0.5)	0	203.1
Cost Method Investments	0		0
North American Coal [Member]
Schedule of Disposal Groups, including Discontinued Operations, Income Statement [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	0	78.8	0	338.1
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	(102.9)	0	(377.2)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)	0	(24.1)	0	(39.1)
Disposal Group, Including Discontinued Operation, Operating Expense	(1.8)	(7.4)	(3.8)	(25.7)
Disposal Group, Including Discontinued Operation, Other Expense	0	(0.4)	0	(1.4)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(1.8)	(31.9)	(3.8)	(66.2)
Discontinued Operation, Tax Effect of Discontinued Operation	0	2.1	0	2.6
LOSS FROM DISCONTINUED OPERATIONS, NET OF TAX	$ (1.8)	$ (29.8)	$ (3.8)	$ (137)

DISCONTINUED OPERATIONS PreTax

DISCONTINUED OPERATIONS PreTax Exit Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
PreTax Exit Costs [Line Items]
Deconsolidation, Gain (Loss), Amount				$ 528.2
Canadian Entities [Member]
PreTax Exit Costs [Line Items]
Investment Impairment of Deconsolidation	$ (0.9)	$ (13.9)	$ 3.2	(494.3)
Contingent Liabilities of Deconsolidated Entities	0	0.5	0	(203.1)
Deconsolidation, Gain (Loss), Amount	$ (0.9)	$ (13.4)	$ 3.2	$ (697.4)

DISCONTINUED OPERATIONS Disco82

DISCONTINUED OPERATIONS Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis - Canadian Entities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Deconsolidation, Gain (Loss), Amount				$ 528.2
Loans to and accounts receivable from the Canadian Entities	$ 69.3		$ 69.3		$ 72.9
Canadian Entities [Member]
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure	69.3		69.3
Deconsolidation, Gain (Loss), Amount	(0.9)	$ (13.4)	3.2	(697.4)
Contingent Liabilities of Deconsolidated Entities	0	$ 0.5	0	$ (203.1)
Bloom Lake Group [Member]
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure	38.1		38.1
Losses on Contingent Liabilities			0
Fair Value, Inputs, Level 1 [Member] | Canadian Entities [Member]
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 1 [Member] | Bloom Lake Group [Member]
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 2 [Member] | Canadian Entities [Member]
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 2 [Member] | Bloom Lake Group [Member]
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 3 [Member] | Bloom Lake Group [Member]
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure	$ 38.1		$ 38.1

CAPITAL STOCK (Details)

CAPITAL STOCK (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Aug. 10, 2016
Class of Stock [Line Items]
Common Shares Issued in Debt to Equity Exchange	2,300,000	1,800,000	1,800,000		2,300,000
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes			$ 10
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes	$ 4.5	$ 12.6			$ 4.5
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes	10.5				10.5
Gain (loss) on extinguishment/restructuring of debt	$ (18.3)			$ 79.2	$ 164.1	$ 392.9
Common Stock, Shares, Issued					44,400,000
Shares Issued, Price Per Share							$ 6.75
Net Proceeds from Issuance of Common Shares					$ 287.6	$ 0
Common Stock [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Common Shares Issued Upon Conversion in Lieu of Dividend	1,300,000				1,300,000
Convertible Preferred Stock, Shares Issued upon Conversion	0.9052				0.9052
Common shares, issued (in shares)	26,500,000				26,500,000
Convertible Preferred Stock, Common Shares Issued Upon Conversion	25,200,000				25,200,000
$218.5 Million 8.00% 2020 Lien Notes [Member]
Class of Stock [Line Items]
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes	$ 11.4				$ 11.4
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes	17.9				17.9
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes	$ 30.5				30.5
Exchange of Debt for Equity [Member]
Class of Stock [Line Items]
Gain (loss) on extinguishment/restructuring of debt		$ 3.6	$ 4.5		$ 1.6
Minimum [Member] | Common Stock [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion	0.8621				0.8621

SHAREHOLDERS' EQUITY Schedule o

SHAREHOLDERS' EQUITY Schedule of Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Attributable to Parent	$ (1,544.3)		$ (1,544.3)		$ (1,981.4)
Stockholders' Equity Attributable to Noncontrolling Interest	143.8		143.8		169.8
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,400.5)	$ (1,759.5)	(1,400.5)	$ (1,759.5)	(1,811.6)	$ (1,734.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	(25.8)	10.6	95	(689)
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST	(2)	(4.6)	23.5	(1.5)
Net Income (Loss)	(27.8)	6	118.5	(690.5)
Other Comprehensive Income (Loss), Net of Tax	8.7	4.5	19	211.4
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	(18)	14.4	111.8	(468.3)
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST	0.9	0.7	2.2	(9.3)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			137.5	(479.1)
Deconsolidation, Gain (Loss), Amount				528.2
Stock and Other Incentive Plans			10.1	6
Preferred share dividends				(38.4)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(48.8)	(40.7)
Undistributed Gains To Noncontrolling Interest			(2.9)	(1.2)
Cliffs Shareholders Equity [Member]
Stockholders' Equity Attributable to Parent	(1,544.3)	(1,932)	(1,544.3)	(1,932)	(1,981.4)	(1,431.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS			95	(689)
Other comprehensive income (loss)			16.8	220.7
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS			111.8	(468.3)
Deconsolidation, Gain (Loss), Amount				0
Stock and Other Incentive Plans			10.1	6
Preferred share dividends				(38.4)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			0	0
Undistributed Gains To Noncontrolling Interest			0	0
Noncontrolling Interest [Member]
Stockholders' Equity Attributable to Noncontrolling Interest	$ 143.8	$ 172.5	143.8	172.5	$ 169.8	$ (303)
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST			23.5	(1.5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest			2.2	(9.3)
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST			25.7	(10.8)
Deconsolidation, Gain (Loss), Amount				528.2
Stock and Other Incentive Plans			0	0
Preferred share dividends				0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(48.8)	(40.7)
Undistributed Gains To Noncontrolling Interest			(2.9)	$ (1.2)
Common Stock [Member]
Stock Issued During Period, Value, New Issues			315.2
Common Stock [Member] | Cliffs Shareholders Equity [Member]
Stock Issued During Period, Value, New Issues			315.2
Common Stock [Member] | Noncontrolling Interest [Member]
Stock Issued During Period, Value, New Issues			$ 0

SHAREHOLDERS' EQUITY Accumulate

SHAREHOLDERS' EQUITY Accumulate Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			$ (1,811.6)			$ (1,734.3)	$ (1,811.6)	$ (1,734.3)
Ending Balance	$ (1,400.5)			$ (1,759.5)			(1,400.5)	(1,759.5)
Changes in Pension and Other Post-Retirement Benefits, net of tax [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(230.7)	$ (236.6)	(241.4)	(251.8)	$ (251.5)	(291.1)	(241.4)	(291.1)
Other comprehensive income (loss) before reclassifications	(0.5)	(0.4)	(1.5)	(0.7)	1.3	9.3
Net loss reclassified from accumulated other comprehensive income (loss)	6.7	6.3	6.3	6.6	(1.6)	30.3
Ending Balance	(224.5)	(230.7)	(236.6)	(245.9)	(251.8)	(251.5)	(224.5)	(245.9)
Unrealized Net Gain (Loss) on Securities, net of tax [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	0	0	0.1	(0.1)	(0.2)	(1)	0.1	(1)
Other comprehensive income (loss) before reclassifications	0	0	(0.1)	0.1	1	2.8
Net loss reclassified from accumulated other comprehensive income (loss)	0	0	0	0	(0.9)	(2)
Ending Balance	0	0	0	0	(0.1)	(0.2)	0	0
Unrealized Net Gain (Loss) on Foreign Currency Translation [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	222.4	225.1	220.7	233.6	232.4	64.4	220.7	64.4
Other comprehensive income (loss) before reclassifications	0.9	(2.7)	4.4	(11.4)	1.2	(14.7)
Net loss reclassified from accumulated other comprehensive income (loss)	0	0	0	0	0	182.7
Ending Balance	223.3	222.4	225.1	222.2	233.6	232.4	223.3	222.2
Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(0.7)	(0.8)	2.6	(10.6)	(18.9)	(18.1)	2.6	(18.1)
Other comprehensive income (loss) before reclassifications	0	0.1	(3.4)	4.8	0.5	(7.1)
Net loss reclassified from accumulated other comprehensive income (loss)	0.7	0	0	4.4	7.8	6.3
Ending Balance	0	(0.7)	(0.8)	(1.4)	(10.6)	(18.9)	0	(1.4)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(9)	(12.3)	(18)	(28.9)	(38.2)	(245.8)	(18)	(245.8)
Other comprehensive income (loss) before reclassifications	0.4	(3)	(0.6)	(7.2)	4	(9.7)
Net loss reclassified from accumulated other comprehensive income (loss)	7.4	6.3	6.3	11	5.3	217.3
Ending Balance	$ (1.2)	$ (9)	$ (12.3)	$ (25.1)	$ (28.9)	$ (38.2)	$ (1.2)	$ (25.1)

SHAREHOLDERS' EQUITY Details of

SHAREHOLDERS' EQUITY Details of Accumulated Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		$ 7.4			$ 11			$ 19.9	$ 233.6
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		6.7	$ 6.3	$ 6.3	6.6	$ (1.6)	$ 30.3
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Prior service credits	[1]	(0.4)			1.1			(1.2)	0.5
Defined Benefit Plan, Amortization of Gains (Losses)	[1]	7.1			5.6			20.4	19.5
Curtailments/settlements	[1]	0			(0.1)			0	0.2
Defined Benefit Plan, Effect of Deconsolidation	[2]	0			0			0	15.1
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax		6.7			6.6			19.2	35.3
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax		0			0			0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)		6.7			6.6			19.2	35.3
Accumulated Other-than-Temporary Impairment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities		0			0			0	(3.2)
Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	[2]	0			0			0	182.7
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax		0			0			0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		0			0			0	182.7
Realized Gain (Loss) on Marketable Securities and Other than Temporary Impairment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, Tax		0			0			0	0.3
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, net of tax		0			0			0	(2.9)
Realized Gain Loss On Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax on Derivative Instruments Gain/Loss Reclassified from Accumulated OCI in to Earnings		0.5			(1.9)			(0.5)	(7.9)
Amount of (gain)/loss recognized in income on derivative		0.7			4.4			0.7	18.5
Treasury Locks Amortization [Member] | Realized Gain Loss On Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net		1.2			0			1.2	0
Australian Hedge Contracts [Member] | Realized Gain Loss On Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 0			$ 6.3			$ 0	$ 26.4
[1]	These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. See NOTE 7 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information.
[2]	Represents Canadian accumulated currency translation adjustments that were deconsolidated. See NOTE 14 - DISCONTINUED OPERATIONS for further information.

SHAREHOLDERS' EQUITY Narrative

SHAREHOLDERS' EQUITY Narrative (Details)	Sep. 30, 2016
Empire [Member]
Noncontrolling Interest, Ownership Percentage by Parent	79.00%
Tilden [Member]
Noncontrolling Interest, Ownership Percentage by Parent	85.00%

CASH FLOW INFORMATION (Narrativ

CASH FLOW INFORMATION (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	[2]	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Capital additions	[1]	$ 26.4	$ 17.7	$ 44.5		$ 46.6
Continuing Operations [Member]
Property, Plant and Equipment [Line Items]
Capital additions	[2]					46.6
Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Capital additions						$ 22.4
[1]	Includes capital lease additions and non-cash accruals. Refer to NOTE 17 - CASH FLOW INFORMATION.
[2]	Includes capital additions of $44.5 million related to continuing operations for the nine months ended September 30, 2016. Includes capital additions of $46.6 million and $22.4 million related to continuing operations and discontinued operations, respectively, for the nine months ended September 30, 2015.

CASH FLOW INFORMATION (Reconcil

CASH FLOW INFORMATION (Reconciliation Of Capital Additions To Cash Paid For Capital Expenditures) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Information [Abstract]
Capital additions	[1]	$ 44.5	$ 69
Cash paid for capital expenditures		45.8	57.9
Difference		(1.3)	11.1
Capital Expenditures Incurred but Not yet Paid		(1.3)	10.4
Capital Lease Obligations Incurred		$ 0	$ 0.7
[1]	Includes capital additions of $44.5 million related to continuing operations for the nine months ended September 30, 2016. Includes capital additions of $46.6 million and $22.4 million related to continuing operations and discontinued operations, respectively, for the nine months ended September 30, 2015.

RELATED PARTIES (Narrative) (De

RELATED PARTIES (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)Facility	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Due from Related Parties, Current	$ 52.2		$ 52.2		$ 15.8
Due to Related Parties, Current	7.4		$ 7.4		$ 14.5
U.S. Iron Ore [Member]
Segment Reporting Information [Line Items]
Number of mines (in number of facilities) | Facility			5
Joint Venture Partners [Member] | U.S. Iron Ore [Member]
Segment Reporting Information [Line Items]
Number of mines (in number of facilities) | Facility			3
Empire [Member] | Arcelor Mittal [Member]
Segment Reporting Information [Line Items]
Paid Distributions of Partners' Equity Amounts	41.4	$ 31.7	$ 41.4	$ 31.7
Recorded Distributions of Partners' Equity Amounts	$ 7.4	$ 9	$ 48.8	$ 40.7

RELATED PARTIES (Summary Of Oth

RELATED PARTIES (Summary Of Other Ownership Interests) (Details)	Sep. 30, 2016
Hibbing [Member] | Arcelor Mittal [Member]
Related Party Transaction [Line Items]
Ownership interest, equity method investment	62.30%
Hibbing [Member] | U. S. Steel Canada [Member]
Related Party Transaction [Line Items]
Ownership interest, equity method investment	14.70%
Empire [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	79.00%
Empire [Member] | Arcelor Mittal [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	21.00%
Empire [Member] | U. S. Steel Canada [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	0.00%
Tilden [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	85.00%
Tilden [Member] | Arcelor Mittal [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	0.00%
Tilden [Member] | U. S. Steel Canada [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	15.00%
Other Noncurrent Assets [Member] | Hibbing [Member]
Related Party Transaction [Line Items]
Ownership interest, equity method investment	23.00%

RELATED PARTIES (Summary Of Rel

RELATED PARTIES (Summary Of Related Party Transactions Table Disclosure) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Related Party Transactions [Abstract]
Product revenues from related parties	$ 223.4	$ 208	$ 568.4	$ 468
Product	$ 508.6	$ 542.5	$ 1,237	$ 1,399.9
Related party product revenue as a percent of total product revenue	43.90%	38.30%	45.90%	33.40%

EARNINGS PER SHARE (Earnings Pe

EARNINGS PER SHARE (Earnings Per Share Computation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		25.2		25.2
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements	3	0.1		0.2
Income (Loss) from Continuing Operations	$ (25.1)	$ 49.9	$ 119.1	$ 178.5
Loss (Income) from Continuing Operations Attributable to Noncontrolling Interest	2	4.6	(23.5)	(6.2)
Net Income (Loss) from Continuing Operations Attributable to Cliffs Shareholders	(23.1)	54.5	95.6	172.3
Loss from Discontinued Operations, net of tax	(2.7)	(43.9)	(0.6)	(861.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS	(25.8)	10.6	95	(689)
Preferred Stock Dividends	0	(25.6)	0	(38.4)
Net Income (Loss) Attributable to Cliffs Common Shareholders	$ (25.8)	$ (15)	$ 95	$ (727.4)
Weighted Average Number of Shares:
Basic	206.3	153.2	186.5	153.2
Employee Stock Plans	0	0	2	0
Diluted	206.3	153.2	188.5	153.2
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:
Continuing operations (in dollars per share)	$ (0.11)	$ 0.19	$ 0.51	$ 0.87
Discontinued operations (in dollars per share)	(0.01)	(0.29)	0	(5.62)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share)	(0.12)	(0.10)	0.51	(4.75)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:
Continuing operations (in dollars per share)	(0.11)	0.19	0.51	0.87
Discontinued operations (in dollars per share)	(0.01)	(0.29)	0	(5.62)
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share)	$ (0.12)	$ (0.10)	$ 0.51	$ (4.75)

COMMITMENTS AND CONTINGENCIES N

COMMITMENTS AND CONTINGENCIES Narrative (Details) $ in Millions	Sep. 30, 2016USD ($)
Michigan Electricity Matters [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 13.6