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Business Combinations - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended 270 Months Ended
Jun. 30, 2024
USD ($)
Entity
Jun. 30, 2023
USD ($)
Entity
Jun. 30, 2024
USD ($)
Entity
Jun. 30, 2023
USD ($)
Entity
Dec. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
Entity
Business Acquisition [Line Items]            
Accretion of the discount on acquisition $ 15.0 $ 19.8 $ 33.8 $ 39.6    
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations $ (3.8) $ 10.4 $ 31.1 $ (11.6)    
Number of companies acquired | Entity 30 34 58 45   725
Aggregate amount of maximum earnout obligations related to acquisitions     $ 1,925.8      
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet     1,236.7      
Aggregate amount of earnout obligation expected settlement in cash or stock at option $ 491.8   491.8     $ 491.8
Aggregate amount of earnout obligation expected settlement in cash 744.9   744.9     744.9
Goodwill 341.0   341.0     341.0
Expiration lists 300.9   300.9     300.9
Non-compete agreements 7.5   7.5     7.5
Trade names 0.3   0.3     0.3
Net increase to goodwill     196.4   $ 256.7  
Total revenues 2,785.4 $ 2,478.5 6,061.9 $ 5,223.0    
Brokerage and Risk Management [Member]            
Business Acquisition [Line Items]            
Write-off of amortizable intangible assets   $ 3.1   $ 3.2    
Brokerage [Member]            
Business Acquisition [Line Items]            
Net increase to goodwill     94.4      
Write-off of amortizable intangible assets 14.0   14.0      
Brokerage [Member] | Expiration Lists [Member]            
Business Acquisition [Line Items]            
Business acquisition not deductible for income tax purposes 52.1   52.1     52.1
Brokerage [Member] | Non-Compete Agreements [Member]            
Business Acquisition [Line Items]            
Business acquisition not deductible for income tax purposes 4.1   4.1     4.1
Brokerage [Member] | Trade Names [Member]            
Business Acquisition [Line Items]            
Business acquisition not deductible for income tax purposes $ 0.3   $ 0.3     $ 0.3
Minimum [Member] | Expiration Lists [Member]            
Business Acquisition [Line Items]            
Estimated useful lives of intangibles assets, years 2 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     2 years
Minimum [Member] | Trade Names [Member]            
Business Acquisition [Line Items]            
Estimated useful lives of intangibles assets, years 2 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     15 years
Maximum [Member] | Non-Compete Agreements [Member]            
Business Acquisition [Line Items]            
Estimated useful lives of intangibles assets, years 6 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     15 years
2024 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]            
Business Acquisition [Line Items]            
Measurement input 0.05   0.05     0.05
2024 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]            
Business Acquisition [Line Items]            
Measurement input 0.15   0.15     0.15
2024 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Discount Rate [Member]            
Business Acquisition [Line Items]            
Measurement input 0.09   0.09     0.09
2023 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]            
Business Acquisition [Line Items]            
Measurement input 0.007   0.007     0.007
2023 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]            
Business Acquisition [Line Items]            
Measurement input 0.053   0.053     0.053
2023 Acquisitions [Member] | Valuation, Income Approach | Minimum [Member]            
Business Acquisition [Line Items]            
Attrition rate     5.00%      
2023 Acquisitions [Member] | Valuation, Income Approach | Maximum [Member]            
Business Acquisition [Line Items]            
Attrition rate     11.00%      
2023 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]            
Business Acquisition [Line Items]            
Measurement input 0.095   0.095     0.095
2023 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]            
Business Acquisition [Line Items]            
Measurement input 0.11   0.11     0.11
Business Acquisition [Member]            
Business Acquisition [Line Items]            
Annualized revenue of business acquisitions     $ 141.2      
Total revenues     42.8      
Net earnings     (5.0)      
Net earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earnout payables     7.4      
Business Acquisition [Member] | Brokerage [Member]            
Business Acquisition [Line Items]            
Expiration lists $ 300.9   300.9     $ 300.9
Non-compete agreements 7.5   7.5     7.5
Trade names 0.3   0.3     0.3
Deferred tax liability $ 13.1   $ 13.1     $ 13.1