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Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Total Assets $ 11,663.4   $ 11,663.4   $ 13,191.1
Reportable segment results          
Revenues 1,418.9 $ 1,722.9 4,296.1 $ 5,107.7  
Adjusted EBITDA 129.0 216.3 381.6 606.3  
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]          
Depreciation, depletion and amortization (136.0) (163.6) (430.6) (483.9)  
Asset impairment 0.0 0.0 (900.8) 0.0  
Asset retirement obligation expenses (12.3) (15.0) (40.4) (46.5)  
Amortization of basis difference related to equity affiliates (0.7) (1.5) (4.2) (4.0)  
Interest expense (118.5) (114.5) (344.0) (321.4)  
Loss on early debt extinguishment 0.0 0.0 (67.8) (1.6)  
Interest income 1.4 3.7 6.6 11.7  
Income tax (provision) benefit (6.9) (79.4) 83.2 (30.9)  
Loss from continuing operations, net of income taxes (144.4) (154.0) (1,316.0) (270.3)  
Powder River Basin Mining [Member]          
Reportable segment results          
Revenues 475.0 472.1 1,393.9 1,438.1  
Adjusted EBITDA 120.0 114.5 354.7 382.3  
Midwestern U.S. Mining [Member]          
Reportable segment results          
Revenues 249.4 312.9 768.2 920.5  
Adjusted EBITDA 72.3 87.0 218.6 236.4  
Western U.S. Mining [Member]          
Reportable segment results          
Revenues 177.3 239.0 526.9 681.6  
Adjusted EBITDA 45.7 80.8 147.7 209.8  
Australian Metallurgical Mining [Member]          
Reportable segment results          
Revenues 280.4 398.7 924.6 1,189.1  
Adjusted EBITDA (15.4) (50.9) (2.2) (168.8)  
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]          
Asset impairment     (527.0)    
Australian Thermal Mining [Member]          
Reportable segment results          
Revenues 205.3 277.6 615.2 806.4  
Adjusted EBITDA 49.4 60.3 153.9 204.5  
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]          
Asset impairment     (8.2)    
Trading and Brokerage [Member]          
Segment Reporting Information [Line Items]          
Total Assets 271.5   271.5   300.7
Reportable segment results          
Revenues 24.5 15.0 42.7 46.3  
Adjusted EBITDA 29.4 3.3 30.4 7.7  
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Total Assets 1,730.5   1,730.5   2,167.4
Reportable segment results          
Revenues 7.0 7.6 24.6 25.7  
Adjusted EBITDA (172.4) (78.7) (521.5) (265.6)  
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]          
Asset impairment     (365.6)    
U.S. Mining Segment [Member]          
Segment Reporting Information [Line Items]          
Total Assets 4,085.4   4,085.4   4,099.1
Australian Mining [Member]          
Segment Reporting Information [Line Items]          
Total Assets 5,576.0   5,576.0   $ 6,623.9
Middlemount Mine [Member]          
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]          
Change in deferred tax asset valuation allowance related to equity affiliates $ (0.4) $ 0.0 $ 0.4 $ 0.0