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Acquisitions (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) agency | Dec. 31, 2023 USD ($) agency | Sep. 30, 2023 USD ($)
Asset Acquisition [Line Items] |  |  |
Acquisitions of noncontrolling interests | $ 3.2 | $ 3.2 |
Parent |  |  |
Asset Acquisition [Line Items] |  |  |
Acquisitions of noncontrolling interests | 2.7 | 2.7 |
Non controlling Interests |  |  |
Asset Acquisition [Line Items] |  |  |
Acquisitions of noncontrolling interests | 0.5 | 0.5 |
Two Insurance Agencies |  |  |
Asset Acquisition [Line Items] |  |  |
Fair value of equity method investment | $ 1.6 | $ 1.6 |
Two Insurance Agencies |  |  |
Asset Acquisition [Line Items] |  |  |
Number of insurance agencies purchased | agency | 2 | 2 |
Consideration transferred | $ 5.9 |  |
Payments for asset acquisitions | 4.3 |  |
Deferred consideration | 0.7 |  |
Net working capital | $ 1.1 | $ 1.1 |
Asset acquisition, equity interest in acquiree, remeasurement gain |  |  | $ 1.3
Customer relationships |  |  |
Asset Acquisition [Line Items] |  |  |
Finite-lived intangible asset, useful life (in years) | 4 years 10 months 24 days | 4 years 10 months 24 days |
Customer relationships | Two Insurance Agencies |  |  |
Asset Acquisition [Line Items] |  |  |
Total purchase price | $ 4.8 |  |
Finite-lived intangible asset, useful life (in years) | 7 years | 7 years |

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