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Commitments and Contingencies - Commitments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023
Standby letters of credit |  |
Commitments and Contingencies |  |
Outstanding standby letters of credit | $ 934.5 | $ 878.9
Amount available under letters of credit | 389.8 |
Contingency liability | 938.9 |
Surety Bond |  |
Commitments and Contingencies |  |
Contingency liability | 5,100.0 |
Fund investment capital |  |
Commitments and Contingencies |  |
Commitment | $ 5.9 |
Commitment period | 4 years |

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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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