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Debt Commitments (Tables)
9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Schedule of Debt Obligations and Letters of Credit Outstanding
Debt obligations and letters of credit outstanding at the end of each period consisted of the following:
Average Interest Rate at September 30, 2025
Debt Outstanding
Maturity
Date
September 30,
2025
December 31,
2024
Unsecured revolving credit facility5.19%September 28, 2027$70.0 — 
Senior unsecured promissory notes payable, Series D2.66%May 15, 2025— 75.0 
Senior unsecured promissory notes payable, Series E2.72%May 15, 202750.0 50.0 
Senior unsecured promissory notes payable, Series G2.13%June 24, 202625.0 25.0 
Senior unsecured promissory notes payable, Series H2.50%June 24, 203050.0 50.0 
Total195.0 200.0 
   Less: Current portion of debt(95.0)(75.0)
Long-term debt$100.0 125.0 
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation$29.7 31.2