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Segment Information
 6 Months Ended
Jun. 30, 2011
Segment Information [Abstract]  
Segment Information
(15) Segment Information
     The Company reports its operations primarily through the following reportable operating segments: “Western U.S. Mining,” “Midwestern U.S. Mining,” “Australian Mining,” “Trading and Brokerage” and “Corporate and Other.” The Company’s chief operating decision maker uses Adjusted EBITDA as the primary measure of segment profit and loss. The Company defines Adjusted EBITDA as income from continuing operations before deducting net interest expense, income taxes, asset retirement obligation expense and depreciation, depletion and amortization.
     Operating segment results were as follows:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
    (Dollars in millions)  
Revenues:
                               
Western U.S. Mining
  $ 662.3     $ 652.1     $ 1,366.0     $ 1,314.2  
Midwestern U.S. Mining
    327.9       323.3       694.9       632.7  
Australian Mining
    885.3       597.4       1,465.9       1,043.9  
Trading and Brokerage
    114.1       81.8       198.0       171.9  
Corporate and Other
    18.4       6.8       28.1       14.3  
 
                       
Total
  $ 2,008.0     $ 1,661.4     $ 3,752.9     $ 3,177.0  
 
                       
 
                               
Adjusted EBITDA:
                               
Western U.S. Mining
  $ 134.1     $ 207.3     $ 313.5     $ 415.2  
Midwestern U.S. Mining
    82.0       71.4       191.9       145.5  
Australian Mining
    376.9       223.6       567.4       346.9  
Trading and Brokerage
    50.4       14.3       77.2       46.7  
Corporate and Other
    (63.9 )     (76.2 )     (154.3 )     (156.7 )
 
                       
Total
  $ 579.5     $ 440.4     $ 995.7     $ 797.6  
 
                       
     A reconciliation of Adjusted EBITDA to consolidated income from continuing operations follows:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
    (Dollars in millions)  
Total Adjusted EBITDA
  $ 579.5     $ 440.4     $ 995.7     $ 797.6  
 
                               
Depreciation, depletion and amortization
    105.3       105.1       214.1       210.6  
Asset retirement obligation expense
    15.8       10.9       28.9       20.4  
Interest expense
    49.1       57.9       100.1       107.9  
Interest income
    (3.5 )     (1.6 )     (7.6 )     (2.6 )
Income tax provision
    119.8       53.4       187.6       109.5  
 
                       
Income from continuing operations, net of income taxes
  $ 293.0     $ 214.7     $ 472.6     $ 351.8