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Debt Commitments (Tables) | 6 Months Ended
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Jun. 30, 2020
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 June 30, 2020 |  |  |  | Debt Outstanding
|  | Maturity Date |  | June 30, 2020 |  | December 31, 2019
Unsecured revolving credit facility | 1.10 | % |  | 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 |  |  |  |  | — |  |  | (3.0 | )
Long-term debt |  |  |  |  | $ | 405.0 |  |  | 342.0 |
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation |  |  |  |  | $ | 36.3 |  |  | 36.3 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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