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v3.25.3

Mergers and Acquisitions - Narrative (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jul. 01, 2025 USD ($) | May 16, 2025 USD ($) | May 01, 2025 USD ($) | Feb. 03, 2025 USD ($) | Nov. 04, 2024 USD ($) managingGeneralUnderwriter | Oct. 01, 2024 USD ($) | Sep. 13, 2024 USD ($) program | Sep. 01, 2024 USD ($) | Aug. 30, 2024 USD ($) | May 01, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  | $ 0.3 | $ 5.3 | $ 11.8 | $ 11.4 |
Acquiree's revenue since acquisition date |  |  |  |  |  |  |  |  |  |  | 23.2 | 24.5 | 78.5 | 33.8 |
Estimated tax deductible goodwill |  |  |  |  |  |  |  |  |  |  | 39.3 | 545.6 | 39.3 | 545.6 |
Increase (decrease) of income tax expense related to the common control reorganization |  |  |  |  |  |  |  |  |  |  |  |  | (48.0) | 59.4 |
Increase (decrease) in financing costs and interest expense |  |  |  |  |  |  |  |  |  |  |  | (18.1) |  | 47.2 |
Increase (decrease) of amortization expense on acquired intangible assets |  |  |  |  |  |  |  |  |  |  | (6.3) | $ 23.4 | (7.7) | 96.0 |
Increase (decrease) in transaction costs |  |  |  |  |  |  |  |  |  |  |  |  | (11.1) | 13.6 |
Decrease in tax expenses related to pro forma adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.9 |
2025 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  |  |  |  | 44.1 |  | $ 44.1 |  |
2025 Acquisitions | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration period |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
2025 Acquisitions | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration period |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Velocity Risk Underwriters, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  |  | $ 548.6 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  | $ 19.6 |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.5 |  |
Measurement period adjustment, other current assets |  |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |
Measurement period adjustments, working capital |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  |
USQRisk Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  | $ 28.7 |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  | $ 23.8 |  |  |  |  |  |  |  |  |  |  |  |
360° Underwriting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  | $ 28.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  | $ 0.6 |  |  |  |  |  |  |  |  |  |  |  |  |
J.M. Wilson Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition | $ 67.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration for acquisition | $ 20.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Castel Underwriting Agencies Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  |  |  |  |  |  |  |  | $ 247.6 |  |  |  |  |
Measurement period adjustments, working capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2.0)
Contingently returnable consideration |  |  |  |  |  |  |  |  |  | 4.9 |  |  |  |  |
Measurement period adjustments, deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6
Measurement period adjustments, taxes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9
Castel Underwriting Agencies Limited | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration for acquisition |  |  |  |  |  |  |  |  |  | $ 2.2 |  |  |  |  |
US Assure Insurance Services of Florida, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  |  |  |  |  |  |  | $ 1,079.8 |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  |  | $ 103.8 |  |  |  |  |  |
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.2
Greenhill Underwriting Insurance Services, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  |  |  |  |  |  | $ 11.7 |  |  |  |  |  |  |
Measurement period adjustments, working capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4
Measurement period adjustments increase (decrease), goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3
Measurement period adjustments, intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1
Ethos Property And Casualty Managing General Underwriters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  |  |  |  |  | $ 44.0 |  |  |  |  |  |  |  |
Underwriting programs for insurance carriers (in programs) | program |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |
EverSports & Entertainment Insurance, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  |  |  |  | $ 43.1 |  |  |  |  |  |  |  |  |
Measurement period adjustment related to commissions and fees receivable – net |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 |  |
Innovisk Capital Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition |  |  |  |  | $ 426.8 |  |  |  |  |  |  |  |  |  |
Measurement period adjustment related to commissions and fees receivable – net |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |
Number of managing general underwriters | managingGeneralUnderwriter |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |
Measurement period adjustment related to current accrued compensation |  |  |  |  |  |  |  |  |  |  |  |  | 2.3 |  |
Business Combinations, Aggregate Business Combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration obligation, maximum |  |  |  |  |  |  |  |  |  |  | 605.7 |  | 605.7 |  |
Contingently returnable consideration, maximum |  |  |  |  |  |  |  |  |  |  | $ 13.4 |  | $ 13.4 |  |

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