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Discontinued Operations (Details)
AUD in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
AUD
Sep. 30, 2016
AUD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Disposal Group, Including Discontinued Operation, Other Assets, Current $ 0.2       $ 0.2 $ 0.2 $ 3.1      
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax           (57.6) (182.2) $ (23.8)    
Discontinued Operation, Tax Effect of Discontinued Operation           0.0 (7.2) 4.4    
Loss from discontinued operations, net of income taxes 13.1 $ 38.1 $ 155.1 $ 7.6 (53.6) (57.6) (175.0) $ (28.2)    
Disposal Group, Including Discontinued Operation, Assets, Noncurrent 15.9       15.9 15.9 13.2      
Disposal Group, Including Discontinued Operation, Assets 16.1       16.1 16.1 16.3      
Disposal Group, Including Discontinued Operation, Liabilities, Current 55.9       55.9 55.9 60.0      
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent 198.5       198.5 198.5 203.7      
Liabilities Subject to Compromise 8,440.2       8,440.2 8,440.2 0.0      
Disposal Group, Including Discontinued Operation, Liabilities 275.3       275.3 275.3 263.7      
United Mine Workers of America [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Loss from discontinued operations, net of income taxes 54.3                  
Wilkie Creek [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Loss Contingency, Loss in Period             9.7      
Settlement charges total 9.9       9.9 9.9     AUD 13.0 AUD 13.0
Discontinued Operations [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Liabilities Subject to Compromise $ 20.9       $ 20.9 $ 20.9 $ 0.0