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Debt Commitments (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020Debt Outstanding
Maturity
Date
20202019
Unsecured revolving credit facility1.09 %November 30, 2023$ 210.0 
Senior unsecured promissory notes payable, Series A2.00 %July 20, 202140.0 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 — 
Senior unsecured promissory notes payable, Series E2.72 %May 15, 202750.0 — 
Senior unsecured promissory notes payable, Series F1.69 %June 24, 202370.0 — 
Senior unsecured promissory notes payable, Series G2.13 %June 24, 202625.0 — 
Senior unsecured promissory notes payable, Series H2.50 %June 24, 203050.0 — 
Total405.0 345.0 
   Less: Current portion of debt(40.0)(3.0)
Long-term debt$365.0 342.0 
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation$36.3 36.3 
Schedule of Maturities of Long-term Debt
Principal payments required on our outstanding indebtedness, based on the maturity dates defined within our debt arrangements, for the succeeding five years, are displayed in the table below, as of December 31, 2020:
Principal Payments
2021$40.0 
202235.0 
202370.0 
202460.0 
202575.0 
2026 and thereafter125.0 
Total$405.0