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Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Tables)
 6 Months Ended
Jun. 30, 2011
Financial Instruments and Guarantees with Off-Balance-Sheet Risk [Abstract]  
Letters of credit, bank guarantees, surety bonds and corporate guarantees
                                         
                    Workers’              
    Reclamation     Lease     Compensation              
    Obligations     Obligations     Obligations     Other (1)     Total  
    (Dollars in millions)  
Self bonding
  $ 936.6     $ —     $ —     $ —     $ 936.6  
Surety bonds
    613.5       110.3       6.2       10.8       740.8  
Bank guarantees
    139.9       —       —       151.3       291.2  
Letters of credit
    —       —       62.7       2.8       65.5  
Bilateral cash collateralization agreements
    —       —       —       79.7       79.7  
 
                             
 
  $ 1,690.0     $ 110.3     $ 68.9     $ 244.6     $ 2,113.8  
 
                             
 
(1)   Other includes letter of credit and bilateral cash collateralization agreement obligations described below and an additional $162.1 million in bank guarantees and surety bonds related to collateral for surety companies, road maintenance, performance guarantees and other operations.