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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2016
Short-term Debt [Abstract]  
Schedule of information regarding short-term borrowings

 

   (Millions of  Dollars)
   2016  2015
Established Lines at Year-End  $60.0   $60.0 
Maximum Amount Outstanding   13.1    19.0 
Average Outstanding   7.4    15.3 
Notes Payable at Year-End   12.0    3.0 
Weighted Average Interest Rate   1.54%   1.19%
Weighted Average Interest Rate at Year-End   1.71%   1.41%