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Business Combinations - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) Acquisition | Dec. 31, 2021 USD ($) Acquisition | Dec. 31, 2020 USD ($) Acquisition | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition | 30 | 19 |  |
Net assets acquired | $ 2,638.0 | $ 549.4 | $ 893.2 |
Aggregate purchase price of acquisitions | (0.1) | (0.5) | 3.5 |
Payments to Acquire Businesses, Gross | 2,544.4 | 424.6 |  |
Goodwill, Acquired During Period | 1,994.5 | 350.0 | 648.1 |
Goodwill currently deductible for income tax purposes | 74.4 | 179.1 | 516.7 |
Goodwill currently non-deductible for income tax purposes | 1,920.1 |  |  |
Goodwill related to the recorded earn-out payables | 6.3 | 53.0 | 131.4 |
Total revenues related to acquisitions | 217.1 | 63.8 | 93.9 |
Income before income taxes related to acquisitions | (8.8) | (10.6) | 7.5 |
Maximum Future Contingency payments Acquisitions | 542.8 |  |  |
Estimated acquisition earn-out payables | 251.6 | 291.0 | 258.9 | $ 161.5
Goodwill currently non-deductible for income tax purposes excluding related to the recorded earn-out payables | 1,913.8 |  |  |
Other Liabilities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 132.3 | 212.6 | 179.7 |
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 119.3 | 78.4 | 79.2 |
Retail |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 1,366.6 | 346.0 | 300.0 |
National Programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 516.5 | (1.3) | 163.1 |
Wholesale Brokerage |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 111.4 | 5.3 | 185.0 |
Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | $ 0.0 | $ 0.0 | $ 0.1 |
Purchased Customer Accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 14 years 8 months 12 days | 15 years | 15 years |
Non-compete Agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 4 years 1 month 6 days | 5 years | 5 years |
Business Combinations - Asset Deals |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition |  | 1 |  |
Assets and Assumed Certain Liabilities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition | 12 | 13 | 20 |
Business Combinations - Stock Deals |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition | 11 | 2 | 1 |
Book of Business Purchases |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition | 7 | 3 | 4 |
O'Leary and Remedy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill currently non-deductible for income tax purposes |  | $ 117.9 |  |
Other Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net assets acquired |  | $ 29.1 | $ 23.9 |
Other Acquisitions | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net assets acquired | $ 20.0 |  |  |
GRP Holdco Limited |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition costs | $ 3.0 |  |  |

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