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Business Combinations - Additional Information (Details) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 22, 2024 USD ($) Acquisition | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) Acquisition | Dec. 31, 2022 USD ($) Acquisition | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  | 33 | 30 |  |
Aggregate purchase price of acquisitions |  |  | $ (10.9) |  |  |
Cash paid |  | $ 4.7 | 695.1 | $ 2,544.4 |  |
Measurement period adjustment, deferred tax liability |  |  | (17.3) |  |  |
Measurement period adjustment, other current assets |  |  | 5.6 |  |  |
Measurement period adjustment, goodwill |  |  | (12.0) |  |  |
Goodwill |  | 608.7 | 608.7 |  |  |
Goodwill currently deductible for income tax purposes |  | 64.5 | 64.5 |  |  |
Goodwill currently non-deductible for income tax purposes |  | 608.7 | 608.7 |  |  |
Goodwill related to the recorded earn-out payables |  | 15.2 | 15.2 |  |  |
Total revenues related to acquisitions |  |  | 67.9 |  |  |
Income before income taxes related to acquisitions |  |  | 23.8 |  |  |
Maximum future contingency payments acquisitions |  | 640.2 | 640.2 |  |  |
Estimated acquisition earn-out payables |  | 249.2 | 249.2 | 251.6 | $ 291.0 | $ 258.9
Goodwill currently non-deductible for income tax purposes excluding related to the recorded earn-out payables |  | 529.0 | 529.0 |  |  |
Goodwill after deducted for income tax |  | 544.2 | 544.2 |  |  |
Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 2 |  |  |  |  |
Cash paid | $ 37.6 |  |  |  |  |
Other Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables |  | 103.3 | 103.3 | 132.3 |  |
Accounts payable |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables |  | 145.9 | 145.9 | $ 119.3 |  |
Retail |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Measurement period adjustment, goodwill |  |  | 13.1 |  |  |
Goodwill net |  |  | 348.5 |  |  |
National Programs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Measurement period adjustment, goodwill |  |  | (23.5) |  |  |
Goodwill net |  |  | 239.0 |  |  |
Wholesale Brokerage |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Measurement period adjustment, goodwill |  |  | (1.6) |  |  |
Goodwill net |  |  | 21.2 |  |  |
Services |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Measurement period adjustment, goodwill |  |  | $ 0.0 |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  | 7 |  |  |
Business Combinations - Stock Deals |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  | 22 |  |  |
Book of Business Purchases |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  | 4 |  |  |
GRP Holdco Limited |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Maximum potential earn- out payable |  | 0.0 | $ 0.0 |  |  |
Kentro Capital Limited |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  |  | Oct. 01, 2023 |  |  |
Kentro Capital Limited | Retail |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 358.7 | $ 358.7 |  |  |

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