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Debt Commitments (Tables) | 9 Months Ended
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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 facility | 1.03 | % |  | November 30, 2023 |  | $ | — |  |  | — |
Senior unsecured promissory notes payable, Series A | 2.00 | % |  | July 20, 2021 |  | — |  |  | 40.0 |
Senior unsecured promissory notes payable, Series B | 2.45 | % |  | July 20, 2022 |  | 35.0 |  |  | 35.0 |
Senior unsecured promissory notes payable, Series C | 3.22 | % |  | March 1, 2024 |  | 60.0 |  |  | 60.0 |
Senior unsecured promissory notes payable, Series D | 2.66 | % |  | May 15, 2025 |  | 75.0 |  |  | 75.0 |
Senior unsecured promissory notes payable, Series E | 2.72 | % |  | May 15, 2027 |  | 50.0 |  |  | 50.0 |
Senior unsecured promissory notes payable, Series F | 1.69 | % |  | June 24, 2023 |  | 70.0 |  |  | 70.0 |
Senior unsecured promissory notes payable, Series G | 2.13 | % |  | June 24, 2026 |  | 25.0 |  |  | 25.0 |
Senior unsecured promissory notes payable, Series H | 2.50 | % |  | June 24, 2030 |  | 50.0 |  |  | 50.0 |
Total |  |  |  |  | 365.0 |  |  | 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 |

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