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Business Combinations - Additional Information (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
Acquisition
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]            
Number of acquisitions | Acquisition 21          
Aggregate purchase price of acquisitions $ 0.4          
Payments to Acquire Businesses, Gross 2,504.7          
Net assets acquired 2,566.1          
Goodwill, Acquired During Period 1,922.2          
Goodwill currently deductible for income tax purposes 70.7          
Goodwill currently non-deductible for income tax purposes 1,851.5          
Goodwill currently non-deductible for income tax purposes excluding related to the recorded earn-out payables 1,846.5          
Goodwill related to the recorded earn-out payables 5.0          
Total revenues related to acquisitions 116.9          
Income before income taxes related to acquisitions 7.5          
Estimated acquisition earn-out payables 249.9 $ 232.9 $ 291.0 $ 262.9 $ 242.0 $ 258.9
Maximum Future Contingency payments Acquisitions 550.3          
Other Noncurrent Liabilities            
Business Acquisition [Line Items]            
Estimated acquisition earn-out payables 149.4          
Accounts payable            
Business Acquisition [Line Items]            
Estimated acquisition earn-out payables 100.5          
Retail            
Business Acquisition [Line Items]            
Goodwill, Acquired During Period 1,389.0          
National Programs            
Business Acquisition [Line Items]            
Goodwill, Acquired During Period 427.8          
Wholesale Brokerage            
Business Acquisition [Line Items]            
Goodwill, Acquired During Period $ 105.4          
Purchased Customer Accounts            
Business Acquisition [Line Items]            
Weighted average life (years) 14 years 3 months 18 days          
Non-compete Agreements            
Business Acquisition [Line Items]            
Weighted average life (years) 4 years 2 months 12 days          
Business Combinations - Asset Deals            
Business Acquisition [Line Items]            
Number of acquisitions | Acquisition 7          
Assets and Assumed Certain Liabilities            
Business Acquisition [Line Items]            
Number of acquisitions | Acquisition 10          
Book of Business Purchases            
Business Acquisition [Line Items]            
Number of acquisitions | Acquisition 4          
Other Acquisitions | Maximum            
Business Acquisition [Line Items]            
Net assets acquired $ 20.0          
GRP Holdco Limited            
Business Acquisition [Line Items]            
Maximum potential earn-out amount 0.0          
Acquisition costs $ 2.8