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Debt (Tables)
6 Months Ended
Jun. 30, 2011
Debt  
Schedule of Credit Facility
   
June 30,
   
December 31,
 
   
2011
   
2010
 
   
(millions)
 
Borrowings under the revolving credit facility
  $ 0     $ 0  
Term loan  
    85.0       85.0  
Letters of credit     
    7.3       17.3  
Available credit    
    217.7       207.7