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FAIR VALUE OF FINANCIAL INSTRUMENTS FAIR VALUE OF FINANCIAL INSTRUMENTS (Impairment Charges on Financial and Nonfinancial Assets) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill, Impairment Loss |  | $ 0.0 | $ 73.5 |
Tangible Asset Impairment Charges |  |  | 537.8 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  | 13.8 |
Other Asset Impairment Charges |  |  | 562.0 |
Assets, Fair Value Disclosure, Nonrecurring | $ 397.2 |  | 79.4 |
Impairment Charges | 269.5 |  | 644.7 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 0.0 |  | 0.0 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 397.2 |  | 0.0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 0.0 |  | 79.4 |
Global Exploration Investment in Venture [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity Method Investments, Fair Value Disclosure |  |  | 0.0 |
Equity Method Investment, Other than Temporary Impairment |  |  | 9.2 |
Global Exploration Investment in Venture [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity Method Investments, Fair Value Disclosure |  |  | 0.0 |
Global Exploration Investment in Venture [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity Method Investments, Fair Value Disclosure |  |  | 0.0 |
Global Exploration Investment in Venture [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity Method Investments, Fair Value Disclosure |  |  | 0.0 |
Amapa [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  | $ 67.6
Asia Pacific Iron Ore [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill, Fair Value Disclosure |  |  | 0.0 |
Goodwill, Impairment Loss |  |  | 73.5 |
Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill, Fair Value Disclosure |  |  | 0.0 |
Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill, Fair Value Disclosure |  |  | 0.0 |
Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill, Fair Value Disclosure |  |  | 0.0 |
Other Reporting Units [Member] | Other Reporting Units [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 0.0 |
Tangible Asset Impairment Charges |  |  | 11.3 |
Other Reporting Units [Member] | Other Reporting Units [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 0.0 |
Other Reporting Units [Member] | Other Reporting Units [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 0.0 |
Other Reporting Units [Member] | Other Reporting Units [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 0.0 |
Asia Pacific [Member] | Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 0.0 |
Finite-lived Intangible Assets, Fair Value Disclosure |  |  | 0.0 |
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 72.4 |
Tangible Asset Impairment Charges |  |  | 526.5 |
Finite-lived Intangible Assets, Fair Value Disclosure |  |  | 7.0 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  | 24.2 |
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 0.0 |
Finite-lived Intangible Assets, Fair Value Disclosure |  |  | 0.0 |
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | 72.4 |
Finite-lived Intangible Assets, Fair Value Disclosure |  |  | 7.0 |
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Fair Value Disclosure | 397.2 |  |  |
Gain on new debt issued | 269.5 |  |  |
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Fair Value Disclosure | 0.0 |  |  |
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Fair Value Disclosure | 397.2 | $ 134.7 | $ 0.0 |
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument, Fair Value Disclosure | $ 0.0 |  |  |

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