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Short-Term Borrowings (Tables)
6 Months Ended
Jun. 30, 2023
Short-Term Borrowings [Abstract]  
Schedule of lines of credit
   (Millions)         
   As of June 30, 2023         
   Outstanding  Available  Maximum  Credit Type  Renewal Date
Bank of America  $5.0   $55.0   $60.0   Uncommitted  January 25, 2024
PNC Bank   18.5   $49.5    68.0   Committed  July 31, 2025
CoBank   
    12.0    12.0   Committed  November 30, 2023
   $23.5   $116.5   $140.0       
Schedule of information regarding short-term borrowings
   (In Thousands)
   Three Months Ended  Six Months Ended
   June 30,  June 30,
   2023  2022  2023  2022
Average Daily Amounts Outstanding  $24,220   $20,527   $36,848   $17,006 
Weighted Average Interest Rates   6.09%    1.88%    5.75%    1.58%