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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 is summarized below:

 

   (Millions of  Dollars) 
   2017   2016 
Established Lines at Year-End  $92.0   $60.0 
Maximum Amount Outstanding   28.0    13.1 
Average Outstanding   18.6    7.4 
Notes Payable at Year-End   28.0    12.0 
Weighted Average Interest Rate   2.15%   1.54%
Weighted Average Interest Rate at Year-End   2.54%   1.71%