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Short-Term Borrowings (Tables)
3 Months Ended
Mar. 31, 2024
Short-term Borrowings [Abstract]  
Schedule of Lines of Credit The Company maintains lines of credit aggregating $140.0 million.
   (Millions)         
   As of March 31, 2024         
   Outstanding  Available  Maximum  Credit Type  Renewal Date
Bank of America  $
   $60.0   $60.0   Uncommitted  January 24, 2025
PNC Bank   51.0   $17.0    68.0   Committed  January 31, 2026
CoBank, ACB   7.0    5.0    12.0   Committed  May 20, 2026
   $58.0   $82.0   $140.0       
Schedule of Credit Lines and the Weighted Average Interest Rates The weighted average daily amounts of borrowings outstanding under these credit lines and the weighted average interest rates on those amounts were as follows:
   Three Months Ended
   March 31,
   2024  2023
Average Daily Amounts Outstanding  $49,992   $54,561 
Weighted Average Interest Rates   6.42%   5.52%