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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2018
Short-term Debt [Abstract]  
Schedule of information regarding short-term borrowings

Information regarding the Company’s short-term borrowings for the years ended December 31, 2018 and 2017 is summarized below:

 

   (Millions of  Dollars)
   2018  2017
Established Lines at Year-End  $92.0   $92.0 
Maximum Amount Outstanding   48.5    28.0 
Average Outstanding   37.3    18.6 
Notes Payable at Year-End   48.5    28.0 
Weighted Average Interest Rate   3.17%   2.15%
Weighted Average Interest Rate at Year-End   3.57%   2.54%