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Debt Commitments (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021
Debt Outstanding
Maturity
Date
September 30,
2021
December 31,
2020
Unsecured revolving credit facility1.03 %November 30, 2023$— — 
Senior unsecured promissory notes payable, Series A2.00 %July 20, 2021— 40.0 
Senior unsecured promissory notes payable, Series B2.45 %July 20, 202235.0 35.0 
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, 202370.0 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 
Total365.0 405.0 
   Less: Current portion of debt(35.0)(40.0)
Long-term debt$330.0 365.0 
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation$36.3 36.3