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v3.23.1

Business Combinations - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 255 Months Ended
--- | --- | --- | ---
Dec. 20, 2022 USD ($) Employee | Mar. 31, 2023 USD ($) Entity | Mar. 31, 2022 USD ($) Entity | Mar. 31, 2023 USD ($) Entity
Business Acquisition [Line Items] |  |  |  |
Accretion of the discount on acquisition |  | $ 19.8 | $ 9.4 |
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations |  | $ (22.0) | $ (11.5) |
Number of companies acquired | Entity |  | 22 | 31 | 660
Aggregate amount of maximum earnout obligations related to acquisitions |  | $ 1,748.3 |  |
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet |  | 901.8 |  |
Aggregate amount of earnout obligation expected settlement in cash or stock at option |  | 524.0 |  | $ 524.0
Aggregate amount of earnout obligation expected settlement in cash |  | 377.8 |  | 377.8
Goodwill |  | 181.2 |  | 181.2
Expiration lists |  | 147.6 |  | 147.6
Non-compete agreements |  | 6.8 |  | 6.8
Trade names |  | 1.3 |  | 1.3
Total revenues |  | 2,712.2 | $ 2,454.2 |
Brokerage Management [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 181.2 |  | 181.2
Expiration lists |  | 147.6 |  | 147.6
Non-compete agreements |  | 6.8 |  | 6.8
Trade names |  | 1.3 |  | 1.3
Brokerage and Risk Management [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Write-off of amortizable intangible assets |  | 0.1 | $ 0.2 |
Brokerage [Member] | Expiration Lists [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition not deductible for income tax purposes |  | 61.7 |  | 61.7
Brokerage [Member] | Non-Compete Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition not deductible for income tax purposes |  | 6.4 |  | 6.4
Brokerage [Member] | Trade Names [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition not deductible for income tax purposes |  | $ 0.0 |  | 0.0
Minimum [Member] | Expiration Lists [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives of intangibles assets, years |  | 2 years |  |
Minimum [Member] | Non-Compete Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives of intangibles assets, years |  | 2 years |  |
Minimum [Member] | Trade Names [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives of intangibles assets, years |  | 2 years |  |
Maximum [Member] | Expiration Lists [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives of intangibles assets, years |  | 15 years |  |
Maximum [Member] | Non-Compete Agreements [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives of intangibles assets, years |  | 6 years |  |
Maximum [Member] | Trade Names [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives of intangibles assets, years |  | 15 years |  |
2023 Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Trade names |  | $ 1.3 |  | $ 1.3
2023 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Measurement input |  | 0.050 |  | 0.050
2023 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Measurement input |  | 0.200 |  | 0.200
2023 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Discount Rate [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Measurement input |  | 0.090 |  | 0.090
2022 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Measurement input |  | 0.030 |  | 0.030
2022 Acquisitions [Member] | Valuation, Income Approach |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Attrition rate |  | 25.50% |  |
2022 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Measurement input |  | 0.110 |  | 0.110
Business Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Annualized revenue of business acquisitions |  | $ 69.0 |  |
Total revenues |  | 11.7 |  |
Net earnings |  | (2.2) |  |
Business Acquisition [Member] | Brokerage [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Expiration lists |  | 147.6 |  | $ 147.6
Non-compete agreements |  | 6.8 |  | 6.8
Deferred tax liability |  | $ 13.1 |  | $ 13.1
BCHR Holdings, L.P [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Initial gross consideration | $ 660.0 |  |  |
Net of agreed seller funded expenses and net working capital | $ 585.0 |  |  |
Number of employees | Employee | 2,300 |  |  |
Number of credentialed actuaries | Employee | 220 |  |  |
BCHR Holdings, L.P [Member] | Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination period of existence | 100 years |  |  |

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