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Business Combinations - Additional Information (Detail)
 12 Months Ended
Dec. 20, 2022
USD ($)
Employee
Dec. 01, 2021
USD ($)
BrokerageOperation
Dec. 31, 2022
USD ($)
Entity
Employee
Dec. 31, 2021
USD ($)
Entity
Dec. 31, 2020
USD ($)
Entity
Business Acquisition [Line Items]          
Net cash raised through follow-on public offering common stock     $ 123,100,000 $ 1,546,700,000 $ 111,900,000
Accretion of the discount on acquisition     61,000,000.0 35,700,000 32,500,000
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations     $ (22,000,000.0) $ (83,900,000) $ 65,400,000
Number of companies acquired | Entity     89 99 135
Aggregate amount of maximum earnout obligations related to acquisitions     $ 1,946,200,000 $ 1,873,900,000  
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet     1,077,300,000 988,500,000  
Aggregate amount of earnout obligation expected settlement in cash or stock at option     734,000,000.0 670,300,000  
Aggregate amount of earnout obligation expected settlement in cash     343,300,000 318,200,000  
Goodwill     709,900,000    
Expiration lists     564,000,000.0    
Non-compete agreements     19,500,000    
Trade names     6,100,000    
Write-off of amortizable intangible assets     2,000,000.0 17,600,000 $ 51,700,000
Total revenues     8,710,200,000 8,445,800,000  
Goodwill     $ 9,489,400,000 8,666,200,000 6,127,000,000.0
Number of employees | Employee     2,000    
Revision of Prior Period, Adjustment [Member]          
Business Acquisition [Line Items]          
Expiration lists     $ (608,000,000.0)    
Increase in acquired software     59,100,000    
Fair value of earnout liability     (1,600,000)    
Working capital adjustment     106,000,000.0    
Goodwill     441,300,000    
Brokerage Management [Member]          
Business Acquisition [Line Items]          
Goodwill     709,900,000    
Expiration lists     564,000,000.0    
Non-compete agreements     19,500,000    
Trade names     6,100,000    
Brokerage and Risk Management [Member]          
Business Acquisition [Line Items]          
Write-off of amortizable intangible assets     2,000,000.0 17,600,000 51,700,000
Brokerage [Member]          
Business Acquisition [Line Items]          
Goodwill     9,358,100,000 $ 8,544,600,000 $ 6,053,600,000
Brokerage [Member] | Expiration Lists [Member]          
Business Acquisition [Line Items]          
Business acquisition not deductible for income tax purposes     127,800,000    
Brokerage [Member] | Non-Compete Agreements [Member]          
Business Acquisition [Line Items]          
Business acquisition not deductible for income tax purposes     8,500,000    
Brokerage [Member] | Trade Names [Member]          
Business Acquisition [Line Items]          
Business acquisition not deductible for income tax purposes     $ 2,000,000.0    
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    
Willis Towers Watson PLC [Member]          
Business Acquisition [Line Items]          
Initial gross consideration   $ 3,170,000,000      
Potential additional consideration subject to certain revenue targets   $ 750,000,000      
Number of remaining international deferred closings | BrokerageOperation   12      
Initial purchase consideration subject to local regulatory approval   $ 180,000,000      
2021 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.030    
2021 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.052    
2021 Acquisitions [Member] | Valuation, Income Approach [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Attrition rate     5.50%    
2021 Acquisitions [Member] | Valuation, Income Approach [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Attrition rate     9.50%    
2021 Acquisitions [Member] | Valuation, Income Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.100    
2021 Acquisitions [Member] | Valuation, Income Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.165    
Business Acquisition [Member]          
Business Acquisition [Line Items]          
Annualized revenue of business acquisitions     $ 246,500,000    
Total revenues     87,900,000    
Net earnings     (700,000)    
Business Acquisition [Member] | Brokerage [Member]          
Business Acquisition [Line Items]          
Expiration lists     564,000,000.0    
Non-compete agreements     19,500,000    
Deferred tax liability     29,600,000    
2022 Acquisitions [Member]          
Business Acquisition [Line Items]          
Trade names     $ 6,100,000    
2022 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Measurement input     3.0    
2022 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Measurement input     18.5    
2022 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.030    
2022 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.052    
2022 Acquisitions [Member] | Valuation, Income Approach [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Attrition rate     5.50%    
2022 Acquisitions [Member] | Valuation, Income Approach [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Attrition rate     9.50%    
2022 Acquisitions [Member] | Valuation, Income Approach [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.075    
2022 Acquisitions [Member] | Valuation, Income Approach [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.108    
2022 Acquisitions [Member] | Valuation, Income Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.100    
2022 Acquisitions [Member] | Valuation, Income Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Measurement input     0.165    
BCHR Holdings, L.P. [Member]          
Business Acquisition [Line Items]          
Initial gross consideration $ 660,000,000.0        
Net of agreed seller funded expenses and net working capital $ 585,000,000.0        
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