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Commitments and Contingencies (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Fund Investment Capital |  |
Commitments and Contingencies [Line Items] |  |
Capital commitments | $ 5.1 |
Commitment period (in years) | 4 years |
Standby Letters of Credit |  |
Commitments and Contingencies [Line Items] |  |
Outstanding standby letters of credit | $ 895.2 | $ 934.5
Amount available under unsecured credit facilities | 376.7 |
Contingently liable for issuance of standby letters of credit and surety bonds | 899.6 |
Surety Bond |  |
Commitments and Contingencies [Line Items] |  |
Contingently liable for issuance of standby letters of credit and surety bonds | $ 4,900.0 |

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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