Business Acquisition Purchase Price Allocation Goodwill Not Expected Tax Deductible Amount

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Business Acquisitions Purchase Price Allocation Goodwill Amount

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Business acquisitionsnet earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earnout payables.

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Business combination aggregate earnout obligation expected settlement in cash.

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Business Combination Aggregate Earnout Obligation Recorded Maximum

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Business combination, recognized identifiable assets acquired and liabilities assumed, intangible assets, non-compete agreements.

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Fair Value Inputs, Attrition Rate

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Number of employees.

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Value of input used to measure alternative investment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of increase (decrease) from measurement period adjustment of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The number of businesses acquired by the entity during the period.

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Business Combinations - Additional Information (Detail) $ in Millions						3 Months Ended		279 Months Ended
	Mar. 04, 2025 USD ($) Employee Office	Jan. 07, 2025 USD ($)	Dec. 19, 2024 USD ($)	Dec. 11, 2024 USD ($)	Dec. 07, 2024 USD ($)	Mar. 31, 2025 USD ($) Entity	Mar. 31, 2024 USD ($) Entity	Mar. 31, 2025 USD ($) Entity
Business Acquisition [Line Items]
Cash raised through follow-on common stock offering						$ 1,334.8	$ 52.0
Accretion of the discount on acquisition						13.0	18.8
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations						$ 2.8	$ 34.9
Number of companies acquired \| Entity						28	37	761
Aggregate amount of maximum earnout obligations related to acquisitions						$ 2,154.0
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet						1,368.0
Aggregate amount of earnout obligation expected settlement in cash or stock at option						576.3		$ 576.3
Aggregate amount of earnout obligation expected settlement in cash						791.7		791.7
Goodwill						258.0		258.0
Expiration lists						200.8		200.8
Non-compete agreements						16.9		16.9
Net increase to goodwill						53.8
Total revenues						3,741.1	$ 3,285.7
Brokerage [Member]
Business Acquisition [Line Items]
Net increase to goodwill						53.8
Write-off of amortizable intangible assets						40.6
Brokerage [Member] \| Expiration Lists [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes						163.9		163.9
Brokerage [Member] \| Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes						16.3		16.3
Insurance Brokerage Management Services [Member]
Business Acquisition [Line Items]
Goodwill						258.0		258.0
Expiration lists						200.8		200.8
Non-compete agreements						$ 16.9		$ 16.9
Minimum [Member] \| Expiration Lists [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						2 years		2 years
Minimum [Member] \| Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						2 years		2 years
Minimum [Member] \| Trade Names [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						2 years		2 years
Maximum [Member] \| Expiration Lists [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						15 years		15 years
Maximum [Member] \| Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						6 years		6 years
Maximum [Member] \| Trade Names [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						15 years		15 years
AssuredPartners, Inc [Member]
Business Acquisition [Line Items]
Gross consideration					$ 13,450.0
Cash raised through follow-on common stock offering				$ 8,500.0
AssuredPartners, Inc [Member] \| Over-Allotment Option [Member]
Business Acquisition [Line Items]
Cash raised through follow-on common stock offering		$ 1,280.0
AssuredPartners, Inc [Member] \| Senior Notes [Member]
Business Acquisition [Line Items]
Cash borrowed from senior notes			$ 5,000.0
Woodruff Sawyer & Co. [Member]
Business Acquisition [Line Items]
Gross consideration	$ 1,200.0
Number of employees \| Employee	600
Woodruff Sawyer & Co. [Member] \| Unites States [Member]
Business Acquisition [Line Items]
Number of offices operating \| Office	14
Woodruff Sawyer & Co. [Member] \| United Kingdom [Member]
Business Acquisition [Line Items]
Number of offices operating \| Office	1
2025 Acquisitions [Member] \| Valuation, Market Approach [Member] \| Measurement Input, Discount Rate [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Measurement input						0.05		0.05
2025 Acquisitions [Member] \| Valuation, Market Approach [Member] \| Measurement Input, Discount Rate [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Measurement input						0.175		0.175
2025 Acquisitions [Member] \| Valuation, Income Approach \| Measurement Input, Discount Rate [Member]
Business Acquisition [Line Items]
Measurement input						0.09		0.09
2025 Acquisitions [Member] \| Valuation, Income Approach \| Measurement Input, Long-term Revenue Growth Rate [Member]
Business Acquisition [Line Items]
Measurement input						0.11		0.11
2024 Acquisitions [Member] \| Valuation, Market Approach [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Measurement input						0.03		0.03
2024 Acquisitions [Member] \| Valuation, Market Approach [Member] \| Measurement Input, Long-term Revenue Growth Rate [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Measurement input						0.041		0.041
2024 Acquisitions [Member] \| Valuation, Income Approach \| Minimum [Member]
Business Acquisition [Line Items]
Attrition rate						5.00%
2024 Acquisitions [Member] \| Valuation, Income Approach \| Maximum [Member]
Business Acquisition [Line Items]
Attrition rate						12.00%
Business Acquisition [Member]
Business Acquisition [Line Items]
Annualized revenue of business acquisitions						$ 100.9
Total revenues						14.3
Net earnings						(1.3)
Net earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earnout payables						2.9
Business Acquisition [Member] \| Brokerage [Member]
Business Acquisition [Line Items]
Expiration lists						200.8		$ 200.8
Non-compete agreements						16.9		16.9
Deferred tax liability						$ 47.2		$ 47.2