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Debt Commitments (Tables)
12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Debt Obligations and Letters of Credit Outstanding
Debt obligations and letters of credit outstanding at year end consisted of the following:
Average
Interest Rate at
December 31,
2023
Debt Outstanding
Maturity
Date
20232022
Unsecured revolving credit facility6.36 %September 28, 2027$ 225.0 
Senior unsecured promissory notes payable, Series C3.22 %March 1, 202460.0 60.0 
Senior unsecured promissory notes payable, Series D2.66 %May 15, 202575.0 75.0 
Senior unsecured promissory notes payable, Series E2.72 %May 15, 202750.0 50.0 
Senior unsecured promissory notes payable, Series F1.69 %June 24, 2023 70.0 
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 
Total260.0 555.0 
   Less: Current portion of debt(60.0)(201.8)
Long-term debt$200.0 353.2 
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation$32.7 36.3 
Schedule of Maturities of Long-term Debt
Principal payments required on our outstanding indebtedness, based on the maturity dates defined within our long-term debt arrangements, for the succeeding five years, are displayed in the table below, as of December 31, 2023:
Principal Payments
2024$60.0 
202575.0 
202625.0 
202750.0 
2028— 
2029 and thereafter50.0 
     Total$260.0