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Business Combinations - Additional Information (Details) $ in Millions |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) Acquisition | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  | 21 |  |  |  |  |
Purchase price of acquisitions |  | $ 10.9 |  |  |  |  |
Increase (decrease) in goodwill |  | (9.7) |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 2.9 | 176.8 |  |  |  |  |
Net assets acquired | 233.0 | 233.0 |  |  |  |  |
Total consideration | 233.0 | 233.0 |  |  |  |  |
Goodwill | 154.2 | 154.2 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 35.0 | 35.0 |  |  |  |  |
Goodwill currently non-deductible for income tax purposes | 107.0 | 107.0 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 12.2 | 12.2 |  |  |  |  |
Total revenues related to acquisitions |  | 17.6 |  |  |  |  |
Income before income taxes related to acquisitions |  | 5.3 |  |  |  |  |
Estimated acquisition earn-out payables | 258.2 | 258.2 | $ 231.5 | $ 251.7 | $ 249.9 | $ 232.9 | $ 291.0
Maximum Future Contingency payments Acquisitions | 550.5 | 550.5 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables |  |  | $ 89.5 |  |  |  |
Accounts payable |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 168.7 | 168.7 |  |  |  |  |
Retail |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in goodwill |  | 15.5 |  |  |  |  |
Goodwill net |  | 154.0 |  |  |  |  |
National Programs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in goodwill |  | (23.5) |  |  |  |  |
Goodwill net |  | (21.1) |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in goodwill |  | (1.7) |  |  |  |  |
Goodwill net |  | $ 21.2 |  |  |  |  |
Purchased Customer Accounts |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life (years) |  | 14 years 9 months 18 days |  |  |  |  |
Non-compete Agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life (years) |  | 4 years 4 months 24 days |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net assets acquired | 233.0 | $ 233.0 |  |  |  |  |
Total consideration | 233.0 | 233.0 |  |  |  |  |
Goodwill | 154.2 | 154.2 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration | 50.0 | 50.0 |  |  |  |  |
GRP Holdco Limited |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Maximum potential earn-out amount | $ 0.0 | $ 0.0 |  |  |  |  |

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