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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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Number of offices.

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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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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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Business Combinations - Additional Information (Detail) $ in Millions						3 Months Ended		6 Months Ended		282 Months Ended
	Apr. 10, 2025 USD ($) office Employee	Jan. 07, 2025 USD ($)	Dec. 19, 2024 USD ($)	Dec. 11, 2024 USD ($)	Dec. 07, 2024 USD ($)	Jun. 30, 2025 USD ($) acquisition	Jun. 30, 2024 USD ($) acquisition	Jun. 30, 2025 USD ($) acquisition	Jun. 30, 2024 USD ($) acquisition	Jun. 30, 2025 USD ($) company
Business Acquisition [Line Items]
Cash raised through follow-on common stock offering								$ 1,378.4	$ 93.5
Accretion of the discount on acquisition						$ 11.1	$ 15.0	24.1	33.8
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations						$ 16.7	$ 3.8	$ 13.9	$ 31.1
Number of companies acquired						36	30	56	58	770
Aggregate amount of maximum earnout obligations related to acquisitions						$ 1,411.5		$ 1,411.5		$ 1,411.5
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet						600.3		600.3		600.3
Aggregate amount of earnout obligation expected settlement in cash or stock at option						546.7		546.7		546.7
Aggregate amount of earnout obligation expected settlement in cash						53.6		53.6		53.6
Goodwill						1,027.7		1,027.7		1,027.7
Expiration lists						935.7		935.7		935.7
Non-compete agreements						21.6		21.6		21.6
Total revenues						3,229.5	$ 2,872.1	7,031.7	$ 6,218.5
Brokerage
Business Acquisition [Line Items]
Write-off of amortizable intangible assets							$ 14.0	40.6	$ 14.0
Brokerage \| Expiration Lists
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes						885.0		885.0		885.0
Brokerage \| Non-Compete Agreements
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes						20.6		20.6		20.6
Brokerage Management
Business Acquisition [Line Items]
Goodwill						1,027.7		1,027.7		1,027.7
Expiration lists						935.7		935.7		935.7
Non-compete agreements						$ 21.6		$ 21.6		$ 21.6
Minimum
Business Acquisition [Line Items]
Business combination, earnout payable evaluation period								2 years
Minimum \| Expiration Lists
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						2 years		2 years		2 years
Minimum \| Non-Compete Agreements
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						2 years		2 years		2 years
Minimum \| Trade Names
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						2 years		2 years		2 years
Maximum
Business Acquisition [Line Items]
Business combination, earnout payable evaluation period								3 years
Maximum \| Expiration Lists
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						15 years		15 years		15 years
Maximum \| Non-Compete Agreements
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						6 years		6 years		6 years
Maximum \| Trade Names
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years						15 years		15 years		15 years
AssuredPartners, Inc
Business Acquisition [Line Items]
Gross consideration					$ 13,450.0
Cash raised through follow-on common stock offering				$ 8,500.0
AssuredPartners, Inc \| Over-Allotment Option
Business Acquisition [Line Items]
Cash raised through follow-on common stock offering		$ 1,280.0
AssuredPartners, Inc \| Senior Notes
Business Acquisition [Line Items]
Cash borrowed from senior notes			$ 5,000.0
Business Acquisition
Business Acquisition [Line Items]
Annualized revenue of business acquisitions								$ 391.7
Total revenues								98.3
Net earnings								(28.3)
Net earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earnout payables								1.2
Business Acquisition \| Brokerage
Business Acquisition [Line Items]
Expiration lists						$ 935.7		935.7		$ 935.7
Non-compete agreements						21.6		21.6		21.6
Deferred tax liability						$ 237.8		$ 237.8		$ 237.8
2025 Acquisitions \| Valuation, Market Approach \| Measurement Input, Discount Rate \| Minimum
Business Acquisition [Line Items]
Measurement input						0.050		0.050		0.050
2025 Acquisitions \| Valuation, Market Approach \| Measurement Input, Discount Rate \| Maximum
Business Acquisition [Line Items]
Measurement input						0.175		0.175		0.175
2025 Acquisitions \| Valuation, Income Approach \| Measurement Input, Discount Rate
Business Acquisition [Line Items]
Measurement input						0.090		0.090		0.090
2024 Acquisitions \| Valuation, Market Approach \| Measurement Input, Long-term Revenue Growth Rate \| Minimum
Business Acquisition [Line Items]
Measurement input						0.030		0.030		0.030
2024 Acquisitions \| Valuation, Market Approach \| Measurement Input, Long-term Revenue Growth Rate \| Maximum
Business Acquisition [Line Items]
Measurement input						0.041		0.041		0.041
2024 Acquisitions \| Valuation, Income Approach \| Minimum
Business Acquisition [Line Items]
Attrition rate								5.00%
2024 Acquisitions \| Valuation, Income Approach \| Maximum
Business Acquisition [Line Items]
Attrition rate								12.00%
2024 Acquisitions \| Valuation, Income Approach \| Measurement Input, Long-term Revenue Growth Rate \| Minimum
Business Acquisition [Line Items]
Measurement input						0.110		0.110		0.110
2024 Acquisitions \| Valuation, Income Approach \| Measurement Input, Long-term Revenue Growth Rate \| Maximum
Business Acquisition [Line Items]
Measurement input						0.115		0.115		0.115
Woodruff Sawyer & Co April 10, 2025 (WSC)
Business Acquisition [Line Items]
Gross consideration	$ 1,200.0
Number of employees will accommodate at new facility \| Employee	600
Goodwill						$ 658.1		$ 658.1		$ 658.1
Expiration lists						673.4		673.4		673.4
Non-compete agreements						$ 2.4		$ 2.4		$ 2.4
Woodruff Sawyer & Co April 10, 2025 (WSC) \| United States
Business Acquisition [Line Items]
Number of offices operating \| office	14
Woodruff Sawyer & Co April 10, 2025 (WSC) \| United Kingdom
Business Acquisition [Line Items]
Number of offices operating \| office	1