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Debt - Unsecured Revolving Lines of Credit - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Feb. 28, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 900.0 |  |
Letters of credit, outstanding amount | 19.7 | $ 35.6 |
Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 700.0 |  |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 300.0 |  |
Revolving Credit Facility | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 50.0 |  | $ 250.0
Core Portfolio | Revolving Credit Facility | Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt available balance | 193.1 | 101.1 |
Credit facility amount outstanding | 102.9 | 138.4 |
Letters of credit, outstanding amount | $ 4.0 | $ 10.5 |

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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