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Business Combinations - Additional Information (Details) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) Acquisition | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 7 |  |  |
Purchase price of acquisitions |  | $ 2.9 |  |  |
Payments to Acquire Businesses, Gross | $ 3.6 | 44.7 |  |  |
Payments for businesses acquired, net of cash acquired |  | 37.6 | $ 436.0 |  |
Net assets acquired | 64.5 | 64.5 |  |  |
Goodwill, Acquired During Period |  | 23.0 |  |  |
Goodwill currently deductible for income tax purposes | 1.1 | 1.1 |  |  |
Goodwill currently non-deductible for income tax purposes | 21.7 | 21.7 |  |  |
Goodwill related to the recorded earn-out payables | 0.2 | 0.2 |  |  |
Total revenues related to acquisitions |  | 2.6 |  |  |
Income before income taxes related to acquisitions |  | 1.0 |  |  |
Estimated acquisition earn-out payables | 254.2 | 254.2 | $ 250.9 | $ 251.6 | $ 291.0
Maximum Future Contingency payments Acquisitions | 535.9 | 535.9 |  |  |
Other Noncurrent Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 109.6 | 109.6 |  |  |
Accounts payable |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 144.6 | 144.6 |  |  |
Retail |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Acquired During Period |  | 44.6 |  |  |
National Programs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Acquired During Period |  | (21.6) |  |  |
Wholesale Brokerage |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Acquired During Period |  | $ 0.0 |  |  |
Purchased Customer Accounts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average life (years) |  | 15 years |  |  |
Non-compete Agreements |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average life (years) |  | 5 years |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 1 |  |  |
Other Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets acquired | 64.5 | $ 64.5 |  |  |
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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