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Annual report pursuant to Section 13 and 15(d)

STOCK COMPENSATION PLANS (Narrative) (Details)

v3.3.1.900
STOCK COMPENSATION PLANS (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
Dec. 31, 2015
USD ($)
Agreement
Plan
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans | Plan 听 听 听 2 听 听
Allocated Share-based Compensation Expense | $ 听 听 听 $ 13,900,000 $ 21,500,000 $ 19,100,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 听 听 听 $ 0 $ 7,500,000 $ 6,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plan Year Agreements | Agreement 听 听 听 3 听 听
Number of performance shares granted 听 听 听 3,769,700 听 听
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 听 听 听 $ 23,500,000 听 听
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 听 听 听 2 years 6 months 20 days 听 听
Option Indexed to Issuer's Equity, Strike Price | $ / shares 听 听 听 听 $ 13.83 听
Common Stock, Shares Authorized 400,000,000 听 听 400,000,000 400,000,000 听
2015 Equity Plan [Member] | Maximum [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Maximum number of shares that may be issued (in shares) 听 听 听 12,900,000 听 听
Two Thousand Twelve Equity Plan and Amended Equity Plan [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Performance/vesting period 听 听 3 years 听 听 听
Payout rate, as a percentage of the original grant 听 听 听 听 听 23.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Available for Issuance Proposed to be added to the Plan 听 听 听 5,000,000 听 听
Directors Plan [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Stock Issued During Period Value Director Stock Award | $ $ 42,500 $ 42,500 听 听 $ 85,000 听
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued | $ 听 听 听 $ 85,000 250,000 听
Directors Plan [Member] | Maximum [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Maximum number of shares that may be issued (in shares) 听 听 听 300,000 听 听
2012 Equity Plan [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Number of shares granted under the award 听 听 听 900,000 听 听
Number of performance shares granted 听 听 听 900,000 听 听
Number of restricted shares granted 听 听 听 400,000 听 听
Change in Control [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Allocated Share-based Compensation Expense | $ 听 听 听 听 $ 11,700,000 听
2015 to 2017 Performance Period [Member] | Two Thousand Twelve Equity Plan and Amended Equity Plan [Member] | Minimum [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Payout rate, as a percentage of the original grant 听 听 0.00% 听 听 听
2015 to 2017 Performance Period [Member] | Two Thousand Twelve Equity Plan and Amended Equity Plan [Member] | Maximum [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Payout rate, as a percentage of the original grant 听 听 200.00% 听 听 听
Restricted Stock Units (RSUs) [Member] | 2015 Equity Plan [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Number of restricted shares granted 听 听 听 1,500,000 听 听
Cliffs Natural Resource Inc. 2015 Employee Stock Purchase Plan [Member] 听 听 听 听 听 听
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 听 听 听 听 听 听
Common Stock, Shares Authorized 听 听 听 10,000,000 听 听