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Debt Commitments - Debt Obligations and Letters of Credit Outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Total | $ 555.0 | $ 390.0
Less: Current portion of debt | (201.8) | (60.0)
Long-term debt | $ 353.2 | 330.0
Credit Facility | Unsecured Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, weighted per annum | 5.35% |
Total | $ 225.0 | 25.0
Credit Facility | Letter of Credit Subfacility |  |
Debt Instrument [Line Items] |  |
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation | 36.3 | 36.3
Senior Unsecured Promissory Notes |  |
Debt Instrument [Line Items] |  |
Total | $ 330.0 |
Senior Unsecured Promissory Notes | Senior unsecured promissory notes payable, Series B |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, fixed per annum | 2.45% |
Total | $ 0.0 | 35.0
Senior Unsecured Promissory Notes | Senior unsecured promissory notes payable, Series C |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, fixed per annum | 3.22% |
Total | $ 60.0 | 60.0
Senior Unsecured Promissory Notes | Senior unsecured promissory notes payable, Series D |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, fixed per annum | 2.66% |
Total | $ 75.0 | 75.0
Senior Unsecured Promissory Notes | Senior unsecured promissory notes payable, Series E |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, fixed per annum | 2.72% |
Total | $ 50.0 | 50.0
Senior Unsecured Promissory Notes | Senior unsecured promissory notes payable, Series F |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, fixed per annum | 1.69% |
Total | $ 70.0 | 70.0
Senior Unsecured Promissory Notes | Senior unsecured promissory notes payable, Series G |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, fixed per annum | 2.13% |
Total | $ 25.0 | 25.0
Senior Unsecured Promissory Notes | Senior unsecured promissory notes payable, Series H |  |
Debt Instrument [Line Items] |  |
Average Interest Rate, fixed per annum | 2.50% |
Total | $ 50.0 | $ 50.0

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