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INCOME TAXES INCOME TAXES (Schedule of Effective Rate Reconciliation) (Details) - USD ($) AUD / $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 72.5 |  |  | $ 109.6 |  |  | $ (6.9) |  |
Effective Income Tax Rate Reconciliation, Percent |  | 35.00% |  |  | 35.00% |  |  | 35.00% |
Non-taxable loss (income) related to noncontrolling interests | (8.8) |  |  | (3.0) |  |  | (9.4) |  |
Non-taxable loss (income) related to noncontrolling interests percent |  | (4.20%) |  |  | (1.00%) |  |  | 47.70% |
Impact Of Tax Law Change | 149.1 |  |  | 0.0 |  |  | 13.0 |  |
Impact Of Tax Law Change Percent |  | 72.00% |  |  | 0.00% |  |  | (66.00%) |
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion | (36.1) |  |  | (34.9) |  |  | (87.9) |  |
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion percent |  | (17.40%) |  |  | (11.10%) |  |  | 446.20% |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | (42.7) |  |  | (53.9) |  |  | 51.4 |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  | (20.60%) |  |  | (17.20%) |  |  | (260.90%) |
Income not subject to tax | 0.0 |  |  | 0.0 |  |  | (27.7) |  |
Income not subject to tax percent |  | 0.00% |  |  | 0.00% |  |  | 140.60% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount | 0.0 |  |  | 0.0 |  |  | 22.7 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent |  | 0.00% |  |  | 0.00% |  |  | (115.20%) |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 0.4 |  |  | 0.2 |  |  | (25.4) |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  | 0.20% |  |  | 0.10% |  |  | 128.90% |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount | 0.0 |  |  | 0.0 |  |  | (347.1) |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent |  | 0.00% |  |  | 0.00% |  |  | 1761.90% |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 93.9 |  |  | (104.6) |  |  | 318.3 |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  | 45.40% |  |  | (33.40%) |  |  | (1615.70%) |
Effective Income Tax Reconciliation, Valuation Allowance Prior Year | (142.6) |  |  | 165.8 |  |  | 15.2 |  |
Effective Income Tax Reconciliation, Valuation Allowance Prior Year, Percent |  | (68.90%) |  |  | 52.90% |  |  | (77.20%) |
Tax Adjustments, Settlements, and Unusual Provisions | (11.3) |  |  | 84.1 |  |  | 0.0 |  |
Tax Adjustments Settlements And Unusual Provisions Percent |  | (5.50%) |  |  | 26.90% |  |  | 0.00% |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  | (5.70%) | (1180.00%) |  | 1.90% | 590.00% |  | 32.10% | (630.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | (1.4) |  |  | 0.1 |  |  | 4.1 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | (0.70%) |  |  | 0.00% |  |  | (20.90%) |
Income Tax Expense (Benefit) | (12.2) |  |  | 169.3 |  |  | (86.0) |  |
Income Tax Expense Benefit Percent |  | (5.90%) |  |  | 54.10% |  |  | 436.50% |
Worthless Stock Deduction, Amount | $ (73.4) |  |  | $ 0.0 |  |  | $ 0.0 |  |
Worthless Stock Deduction, Percent |  | (35.50%) |  |  | 0.00% |  |  | 0.00% |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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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=68052875&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=68052875&loc=d3e28511-109314 + Details
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