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Debt (Tables)
3 Months Ended
Mar. 31, 2012
Debt  
Schedule of Credit Facility
   
March 31,
   
December 31,
 
   
2012
   
2011
 
   
(millions)
 
Borrowings under the revolving credit facility
  $ -     $ -  
Term loan due May 31, 2013      
    85.0       -  
Term loan due May 31, 2012    
    -       85.0  
Letters of credit      
    19.7       19.6  
Available credit    
    75.6       205.4