-Network: (11 - Statement - Statement Of Income)

-Income Statement [Abstract] {ID1}

-Statement [Table] {ID2}

-Statement [Line Items] {ID3}

-REVENUES FROM PRODUCT SALES AND SERVICES {ID4}

Product {ID5}

Freight and venture partners' cost reimbursements {ID6}

Revenues, Total {ID7}

COST OF GOODS SOLD AND OPERATING EXPENSES {ID8}

SALES MARGIN {ID9}

-OTHER OPERATING INCOME (EXPENSE) {ID10}

Royalties and management fee revenue {ID11}

Selling, general and administrative expenses {ID12}

Casualty recoveries {ID13}

Gain (loss) on sale of assets {ID14}

Miscellaneous - net {ID15}

Operating Expenses {ID16}

OPERATING INCOME (LOSS) {ID17}

-OTHER INCOME (EXPENSE) {ID18}

Changes in fair value of foreign currency contracts, net {ID19}

Interest income {ID20}

Interest expense {ID21}

Other non-operating income (expense) {ID22}

Nonoperating Income (Expense), Total {ID23}

INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES {ID24}

INCOME TAX BENEFIT (EXPENSE) {ID25}

EQUITY LOSS FROM VENTURES {ID26}

NET INCOME {ID27}

LESS: NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST {ID28}

NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS {ID29}

PREFERRED STOCK DIVIDENDS {ID30}

INCOME APPLICABLE TO COMMON SHARES {ID31}

EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - BASIC {ID32}

EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - DILUTED {ID33}

-AVERAGE NUMBER OF SHARES (IN THOUSANDS) {ID34}

Basic {ID35}

Diluted {ID36}

CASH DIVIDENDS PER SHARE {ID37}

-Network: (12 - Statement - Statement Of Financial Position Classified)

-Statement of Financial Position [Abstract] {ID38}

-Statement [Table] {ID39}

-Statement [Line Items] {ID40}

-ASSETS {ID41}

-CURRENT ASSETS {ID42}

Cash and cash equivalents {ID43}

Accounts receivable {ID44}

Inventories {ID45}

Supplies and other inventories {ID46}

Derivative assets {ID47}

Other current assets {ID48}

TOTAL CURRENT ASSETS {ID49}

PROPERTY, PLANT AND EQUIPMENT, NET {ID50}

-OTHER ASSETS {ID51}

Investments in ventures {ID52}

Intangible assets, net {ID53}

Deferred income taxes {ID54}

Other non-current assets {ID55}

TOTAL OTHER ASSETS {ID56}

TOTAL ASSETS {ID57}

-LIABILITIES {ID58}

-CURRENT LIABILITIES {ID59}

Accounts payable {ID60}

Accrued expenses {ID61}

Taxes payable {ID62}

Derivative liabilities {ID63}

Deferred revenue {ID64}

Other current liabilities {ID65}

TOTAL CURRENT LIABILITIES {ID66}

POSTEMPLOYMENT BENEFIT LIABILITIES {ID67}

LONG-TERM DEBT {ID68}

BELOW-MARKET SALES CONTRACTS {ID69}

OTHER LIABILITIES {ID70}

TOTAL LIABILITIES {ID71}

3.25% REDEEMABLE CUMULATIVE CONVERTIBLE PERPETUAL PREFERRED STOCK - ISSUED 172,500 SHARES 205 SHARES OUTSTANDING IN 2008 {ID72}

-EQUITY {ID73}

-CLIFFS SHAREHOLDERS' EQUITY {ID74}

Common Shares - par value $0.125 per share Authorized - 224,000,000 shares; Issued - 134,623,925 shares (2008 - 134,623,528 shares); Outstanding - 130,994,855 shares (2008 - 113,508,990 shares) {ID75}

Capital in excess of par value of shares {ID76}

Retained Earnings {ID77}

Cost of 3,629,070 common shares in treasury (2008 - 21,114,538 shares) {ID78}

Accumulated other comprehensive loss {ID79}

TOTAL CLIFFS SHAREHOLDERS' EQUITY {ID80}

NONCONTROLLING INTEREST {ID81}

TOTAL EQUITY {ID82}

TOTAL LIABILITIES AND EQUITY {ID83}

-Network: (13 - Statement - Statement Of Financial Position Classified (Parenthetical))

-Statement of Financial Position [Abstract] {ID84}

-Statement [Table] {ID85}

-Statement [Line Items] {ID86}

3.25% REDEEMABLE CUMULATIVE CONVERTIBLE PERPETUAL PREFERRED STOCK, ISSUED {ID87}

3.25% REDEEMABLE CUMULATIVE CONVERTIBLE PERPETUAL PREFERRED STOCK, OUTSTANDING {ID88}

Common Shares, par value {ID89}

Common Shares, Authorized {ID90}

Common Shares, Issued {ID91}

Common Shares, Outstanding {ID92}

Common shares in treasury {ID93}

-Network: (14 - Statement - Statement Of Cash Flows Indirect)

-Statement of Cash Flows [Abstract] {ID94}

-Statement [Table] {ID95}

-Statement [Line Items] {ID96}

-CASH FLOW FROM OPERATIONS OPERATING ACTIVITIES: {ID97}

Net income {ID98}

-Adjustments to reconcile net income to net cash provided (used) by operating activities: {ID99}

Depreciation, depletion and amortization {ID100}

Derivatives and currency hedges {ID101}

Changes in deferred revenue {ID102}

Pensions and other postretirement benefits {ID103}

Deferred income taxes {ID104}

Environmental and mine closure obligations {ID105}

Loss (gain) on sale of assets {ID106}

Property damage recoveries {ID107}

Foreign exchange gain {ID108}

Share-based compensation {ID109}

Excess tax benefit from share-based compensation {ID110}

Income tax uncertainties {ID111}

Equity loss in ventures (net of tax) {ID112}

Other {ID113}

-Changes in operating assets and liabilities: {ID114}

Receivables and other assets {ID115}

Product inventories {ID116}

Payables and accrued expenses {ID117}

Net cash provided (used) by operating activities {ID118}

-INVESTING ACTIVITIES {ID119}

Purchase of noncontrolling interest in Portman {ID120}

Purchase of property, plant and equipment {ID121}

Investments in ventures {ID122}

Additional investment in Amapa {ID123}

Investment in marketable securities {ID124}

Redemption of marketable securities {ID125}

Proceeds from sale of assets {ID126}

Proceeds from property damage insurance recoveries {ID127}

Net cash used by investing activities {ID128}

-FINANCING ACTIVITIES {ID129}

Net proceeds from issuance of common shares {ID130}

Borrowings under credit facility {ID131}

Repayments under credit facility {ID132}

Borrowings under senior notes {ID133}

Common stock dividends {ID134}

Preferred stock dividends {ID135}

Repayment of other borrowings {ID136}

Excess tax benefit from share-based compensation {ID137}

Contributions by (to) joint ventures, net {ID138}

Net cash provided by financing activities {ID139}

EFFECT OF EXCHANGE RATE CHANGES ON CASH {ID140}

INCREASE IN CASH AND CASH EQUIVALENTS {ID141}

CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD {ID142}

CASH AND CASH EQUIVALENTS AT END OF PERIOD {ID143}

-Network: (15 - Disclosure - Notes to Financial Statements)

-Notes to Financial Statements [Abstract] {ID144}

NOTE 1 - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES {ID145}

NOTE 2 - SEGMENT REPORTING {ID146}

NOTE 3 - INVENTORIES {ID147}

NOTE 4 - MARKETABLE SECURITIES {ID148}

NOTE 5 - ACQUISITIONS AND OTHER INVESTMENTS {ID149}

NOTE 6 - INTANGIBLE ASSETS AND LIABILITIES {ID150}

NOTE 7 - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES {ID151}

NOTE 8 - FAIR VALUE OF FINANCIAL INSTRUMENTS {ID152}

NOTE 9 - DEBT AND CREDIT FACILITIES {ID153}

NOTE 10 - LEASE OBLIGATIONS {ID154}

NOTE 11 - ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS {ID155}

NOTE 12 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS {ID156}

NOTE 13 - STOCK COMPENSATION PLANS {ID157}

NOTE 14 - INCOME TAXES {ID158}

NOTE 15 - CAPITAL STOCK {ID159}

NOTE 16 - COMPREHENSIVE INCOME {ID160}

NOTE 17 - EARNINGS PER SHARE {ID161}

NOTE 18 - COMMITMENTS AND CONTINGENCIES {ID162}

NOTE 19 - CASH FLOW INFORMATION {ID163}

NOTE 20 - SUBSEQUENT EVENTS {ID164}

-Network: (16 - Disclosure - Document Information)

-Document Information [Text Block] {ID165}

Document Type {ID166}

Amendment Flag {ID167}

Amendment Description {ID168}

Document Period End Date {ID169}

-Network: (17 - Disclosure - Entity Information)

-Entity [Text Block] {ID170}

Trading Symbol {ID171}

Entity Registrant Name {ID172}

Entity Central Index Key {ID173}

Current Fiscal Year End Date {ID174}

Entity Well-known Seasoned Issuer {ID175}

Entity Current Reporting Status {ID176}

Entity Voluntary Filers {ID177}

Entity Filer Category {ID178}

Entity Common Stock, Shares Outstanding {ID179}

Entity Public Float {ID180}

CLIFFS NATURAL RESOURCES INC. XBRL Taxonomy Presentation Networks