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Debt (Tables)
9 Months Ended
Sep. 30, 2011
Debt 
Schedule of Credit Facility
   
September 30,
   
December 31,
 
   
2011
   
2010
 
   
(millions)
 
Borrowings under the revolving credit facility
  $ -     $ -  
Term loan                                                                       
    85.0       85.0  
Letters of credit                                                                       
    16.9       17.3  
Available credit                                                                       
    208.1       207.7