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Business Combinations - Additional Information (Details) $ in Millions | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) Acquisition | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 21 |  |  |  |  |
Aggregate purchase price of acquisitions | $ 0.4 |  |  |  |  |
Payments to Acquire Businesses, Gross | 2,504.7 |  |  |  |  |
Net assets acquired | 2,566.1 |  |  |  |  |
Goodwill, Acquired During Period | 1,922.2 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 70.7 |  |  |  |  |
Goodwill currently non-deductible for income tax purposes | 1,851.5 |  |  |  |  |
Goodwill currently non-deductible for income tax purposes excluding related to the recorded earn-out payables | 1,846.5 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 5.0 |  |  |  |  |
Total revenues related to acquisitions | 116.9 |  |  |  |  |
Income before income taxes related to acquisitions | 7.5 |  |  |  |  |
Estimated acquisition earn-out payables | 249.9 | $ 232.9 | $ 291.0 | $ 262.9 | $ 242.0 | $ 258.9
Maximum Future Contingency payments Acquisitions | 550.3 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 149.4 |  |  |  |  |
Accounts payable |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 100.5 |  |  |  |  |
Retail |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 1,389.0 |  |  |  |  |
National Programs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 427.8 |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | $ 105.4 |  |  |  |  |
Purchased Customer Accounts |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average life (years) | 14 years 3 months 18 days |  |  |  |  |
Non-compete Agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average life (years) | 4 years 2 months 12 days |  |  |  |  |
Business Combinations - Asset Deals |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 7 |  |  |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 10 |  |  |  |  |
Book of Business Purchases |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 4 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets acquired | $ 20.0 |  |  |  |  |
GRP Holdco Limited |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Maximum potential earn-out amount | 0.0 |  |  |  |  |
Acquisition costs | $ 2.8 |  |  |  |  |

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