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Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Total assets $ 13,151.7   $ 13,191.1
Reportable segment results      
Revenues 1,537.9 $ 1,626.8  
Adjusted EBITDA 165.6 176.9  
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations, Net of Income Taxes [Abstract]      
Depreciation, depletion and amortization (147.5) (157.2)  
Asset retirement obligation expenses (14.2) (15.6)  
Amortization of basis difference related to equity affiliates (1.4) (1.2)  
Interest expense (106.6) (103.3)  
Loss on early debt extinguishment (59.5) 0.0  
Interest income 2.5 3.6  
Income tax (provision) benefit (3.0) 52.5  
Loss from continuing operations, net of income taxes (164.4) (44.3)  
U.S. Mining Segment [Member]      
Segment Reporting Information [Line Items]      
Total assets 4,049.2   4,099.1
Australian Mining [Member]      
Segment Reporting Information [Line Items]      
Total assets 6,437.7   6,623.9
Powder River Basin Mining [Member]      
Reportable segment results      
Revenues 508.9 466.3  
Adjusted EBITDA 140.0 116.0  
Midwestern U.S. Mining [Member]      
Reportable segment results      
Revenues 275.7 303.0  
Adjusted EBITDA 79.0 79.6  
Western U.S. Mining [Member]      
Reportable segment results      
Revenues 180.4 215.7  
Adjusted EBITDA 52.5 59.0  
Australian Metallurgical Mining [Member]      
Reportable segment results      
Revenues 333.3 331.4  
Adjusted EBITDA 13.6 (68.3)  
Australian Thermal Mining [Member]      
Reportable segment results      
Revenues 214.9 280.4  
Adjusted EBITDA 48.3 89.3  
Trading and Brokerage [Member]      
Segment Reporting Information [Line Items]      
Total assets 262.3   300.7
Reportable segment results      
Revenues 16.7 21.0  
Adjusted EBITDA 3.8 (1.9)  
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Total assets 2,402.5   $ 2,167.4
Reportable segment results      
Revenues 8.0 9.0  
Adjusted EBITDA (171.6) (96.8)  
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 $ (0.3) $ 0.0