Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
INCOME TAXES (Schedule of Effective Rate Reconciliation) (Details) - USD ($)
AUD / $ in Millions, $ in Millions
12 Months Ended
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%