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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2013
Commitments And Contingent Liabilities Tables  
Schedule of water cost purchased

Purchased water costs are shown below:

 

   (Millions of Dollars) 
   Years Ended December 31, 
Purchased Water  2013   2012   2011 
Untreated  $2.4   $2.4   $2.4 
Treated   3.2    3.1    2.7 
Total Costs  $5.6   $5.5   $5.1