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Short-term Borrowings (Tables)
12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Schedule of information regarding short-term borrowings Information regarding the Company’s short-term borrowings for the years ended December 31, 2022 and 2021 is summarized below:
   (Millions of Dollars) 
   2022   2021 
Average Amount Outstanding  $28.9   $23.7 
Weighted Average Interest Rate   3.34%   1.12%
Notes Payable at Year-End  $55.5   $13.0 
Weighted Average Interest Rate at Year-End   5.17%   1.04%
Schedule of line of credit The Company maintains bank lines of credit aggregating $140.0 million.
   (Millions)       
   As of December 31, 2022      Line of Credit
   Outstanding   Available   Maximum   Credit Type  Renewal Date
Bank of America  $15.0   $45.0   $60.0    Uncommitted  January 25, 2024
PNC Bank   39.5    28.5    68.0    Committed  January 31, 2024
CoBank, ACB (CoBank)   1.0    11.0    12.0    Committed  November 30, 2023
   $55.5   $84.5   $140.0