Annual report pursuant to Section 13 and 15(d)

INCOME TAXES INCOME TAXES (Schedule of Effective Rate Reconciliation) (Details)

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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%