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Debt Commitments (Tables) | 12 Months Ended
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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, 2020 |  |  |  | Debt Outstanding
|  | Maturity Date |  | 2020 |  | 2019
Unsecured revolving credit facility | 1.09 | % |  | November 30, 2023 |  | $ | — |  |  | 210.0 |
Senior unsecured promissory notes payable, Series A | 2.00 | % |  | July 20, 2021 |  | 40.0 |  |  | 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 |  |  | — |
Senior unsecured promissory notes payable, Series E | 2.72 | % |  | May 15, 2027 |  | 50.0 |  |  | — |
Senior unsecured promissory notes payable, Series F | 1.69 | % |  | June 24, 2023 |  | 70.0 |  |  | — |
Senior unsecured promissory notes payable, Series G | 2.13 | % |  | June 24, 2026 |  | 25.0 |  |  | — |
Senior unsecured promissory notes payable, Series H | 2.50 | % |  | June 24, 2030 |  | 50.0 |  |  | — |
Total |  |  |  |  | 405.0 |  |  | 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 |
2022 | 35.0 |
2023 | 70.0 |
2024 | 60.0 |
2025 | 75.0 |
2026 and thereafter | 125.0 |
Total | $ | 405.0 |

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