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Business Combinations - Additional Information (Details) $ in Millions |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) Acquisition | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  | 13 |  |  |  |  |
Purchase price of acquisitions |  | $ (11.3) |  |  |  |  |
Increase (decrease) in goodwill |  | (9.0) |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 2.7 | 127.2 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 16.8 | 16.8 |  |  |  |  |
Goodwill currently non-deductible for income tax purposes | 91.0 | 91.0 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 9.0 | 9.0 |  |  |  |  |
Total revenues related to acquisitions |  | 12.2 |  |  |  |  |
Income before income taxes related to acquisitions |  | 4.6 |  |  |  |  |
Estimated acquisition earn-out payables | 231.5 | 231.5 | $ 254.2 | $ 251.7 | $ 232.9 | $ 250.9 | $ 291.0
Maximum Future Contingency payments Acquisitions | 550.0 | 550.0 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 105.0 | 105.0 |  |  |  |  |
Accounts payable |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 126.5 | 126.5 |  |  |  |  |
Retail |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in goodwill |  | 14.9 |  |  |  |  |
Goodwill net |  | 136.0 |  |  |  |  |
National Programs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in goodwill |  | (23.9) |  |  |  |  |
Goodwill net |  | (21.0) |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in goodwill |  | 0.0 |  |  |  |  |
Goodwill net |  | $ 1.8 |  |  |  |  |
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 | 169.7 | $ 169.7 |  |  |  |  |
Goodwill | 116.8 | 116.8 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net assets acquired | 50.0 | 50.0 |  |  |  |  |
GRP Holdco Limited |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Maximum potential earn-out amount | $ 0.0 | $ 0.0 |  |  |  |  |

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