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INCOME TAXES INCOME TAXES (Schedule of Effective Rate Reconciliation) (Details) - USD ($) AUD / $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2013
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount |  | $ 109.6 |  |  | $ (6.9) |  |  | $ 416.8 |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | 35.00% |  |  | 35.00% |  |  | 35.00% |
Non-taxable loss (income) related to noncontrolling interests |  | (3.0) |  |  | (9.4) |  |  | (5.4) |  |
Non-taxable loss (income) related to noncontrolling interests percent |  |  | (1.00%) |  |  | 47.70% |  |  | (0.50%) |
Impact Of Tax Law Change |  | 0.0 |  |  | 13.0 |  |  | 0.0 |  |
Impact Of Tax Law Change Percent |  |  | 0.00% |  |  | (66.00%) |  |  | 0.00% |
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion |  | (34.9) |  |  | (87.9) |  |  | (97.6) |  |
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion percent |  |  | (11.10%) |  |  | 446.20% |  |  | (8.20%) |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  | (53.9) |  |  | 51.4 |  |  | (48.7) |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  |  | (17.20%) |  |  | (260.90%) |  |  | (4.10%) |
Income not subject to tax |  | 0.0 |  |  | (27.7) |  |  | (84.7) |  |
Income not subject to tax percent |  |  | 0.00% |  |  | 140.60% |  |  | (7.10%) |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  | 0.0 |  |  | 22.7 |  |  | 0.0 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent |  |  | 0.00% |  |  | (115.20%) |  |  | 0.00% |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount |  | 0.2 |  |  | (25.4) |  |  | 5.6 |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  |  | 0.10% |  |  | 128.90% |  |  | 0.50% |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  | 0.0 |  |  | (347.1) |  |  | 0.0 |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent |  |  | 0.00% |  |  | 1761.90% |  |  | 0.00% |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  | (104.6) |  |  | 318.3 |  |  | 53.2 |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  |  | (33.40%) |  |  | (1615.70%) |  |  | 4.50% |
Effective Income Tax Reconciliation, Valuation Allowance Prior Year |  | 165.8 |  |  | 15.2 |  |  | 0.0 |  |
Effective Income Tax Reconciliation, Valuation Allowance Prior Year, Percent |  |  | 52.90% |  |  | (77.20%) |  |  | 0.00% |
Tax Adjustments, Settlements, and Unusual Provisions |  | 84.1 |  |  | 0.0 |  |  | 12.5 |  |
Tax Adjustments Settlements And Unusual Provisions Percent |  |  | 26.90% |  |  | 0.00% |  |  | 1.10% |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  |  | 1.90% | 590.00% |  | 32.10% | (630.00%) |  | 0.40% | 490.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | 0.1 |  |  | 4.1 |  |  | (19.0) |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  | 0.00% |  |  | (20.90%) |  |  | (1.60%) |
Income Tax Expense (Benefit) | $ (207.3) | $ 169.3 |  |  | $ (86.0) |  |  | $ 237.6 |  |
Income Tax Expense Benefit Percent |  |  | 54.10% |  |  | 436.50% |  |  | 20.00% |

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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28511-109314 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration