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INCOME TAXES (Schedule of Effective Rate Reconciliation) (Details) - USD ($) AUD / $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 45.3 |  |  | $ 72.5 |  |  | $ 109.6 |  |
Effective Income Tax Rate Reconciliation, Percent |  | 35.00% |  |  | 35.00% |  |  | 35.00% |
Non-taxable loss (income) related to noncontrolling interests | 1.3 |  |  | (8.8) |  |  | (3.0) |  |
Non-taxable loss (income) related to noncontrolling interests percent |  | 1.00% |  |  | (4.20%) |  |  | (1.00%) |
Impact Of Tax Law Change | 407.5 |  |  | 149.1 |  |  | 0.0 |  |
Impact Of Tax Law Change Percent |  | 314.80% |  |  | 72.00% |  |  | 0.00% |
Prior year adjustments made in current year, amount | (1.1) |  |  | (11.8) |  |  | 5.9 |  |
Prior year adjustments made in current year, percent |  | (0.80%) |  |  | (5.70%) |  |  | 1.90% |
Tax law change, remeasurement, amount | (407.5) |  |  | (149.1) |  |  | 0.0 |  |
Tax law change, remeasurement, percent |  | (314.80%) |  |  | (72.00%) |  |  | 0.00% |
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion | (61.6) |  |  | (36.1) |  |  | (34.9) |  |
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion percent |  | (47.60%) |  |  | (17.40%) |  |  | (11.10%) |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | 475.4 |  |  | (42.7) |  |  | (53.9) |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  | 367.20% |  |  | (20.60%) |  |  | (17.20%) |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | (0.1) |  |  | 0.4 |  |  | 0.2 |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  | 0.00% |  |  | 0.20% |  |  | 0.10% |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | (471.7) |  |  | 93.9 |  |  | (104.6) |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  | (364.40%) |  |  | 45.40% |  |  | (33.40%) |
Repeal of AMT, amount | (235.3) |  |  | 0.0 |  |  | 0.0 |  |
Repeal of AMT, percent |  | (181.70%) |  |  | 0.00% |  |  | 0.00% |
Tax Adjustments, Settlements, and Unusual Provisions | (1.4) |  |  | (11.3) |  |  | 84.1 |  |
Tax Adjustments Settlements And Unusual Provisions Percent |  | (1.10%) |  |  | (5.50%) |  |  | 26.90% |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  | (2.40%) | (300.00%) |  | 3.10% | 650.00% |  | 52.90% | 16580.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | (0.2) |  |  | (1.4) |  |  | 0.1 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | (0.20%) |  |  | (0.70%) |  |  | 0.00% |
Income Tax Expense (Benefit) | (252.4) |  |  | (12.2) |  |  | 169.3 |  |
Income Tax Expense Benefit Percent |  | (195.00%) |  |  | (5.90%) |  |  | 54.10% |
Worthless Stock Deduction, Amount | $ 0.0 |  |  | $ (73.4) |  |  | $ 0.0 |  |
Worthless Stock Deduction, Percent |  | 0.00% |  |  | (35.50%) |  |  | 0.00% |

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