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Business Combinations - Additional Information (Details)
$ in Millions
6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Acquisition
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]              
Number of acquisitions | Acquisition   13          
Purchase price of acquisitions   $ (11.3)          
Increase (decrease) in goodwill   (9.0)          
Payments to Acquire Businesses, Gross $ 2.7 127.2          
Goodwill currently deductible for income tax purposes 16.8 16.8          
Goodwill currently non-deductible for income tax purposes 91.0 91.0          
Goodwill related to the recorded earn-out payables 9.0 9.0          
Total revenues related to acquisitions   12.2          
Income before income taxes related to acquisitions   4.6          
Estimated acquisition earn-out payables 231.5 231.5 $ 254.2 $ 251.7 $ 232.9 $ 250.9 $ 291.0
Maximum Future Contingency payments Acquisitions 550.0 550.0          
Other Noncurrent Liabilities              
Business Acquisition [Line Items]              
Estimated acquisition earn-out payables 105.0 105.0          
Accounts payable              
Business Acquisition [Line Items]              
Estimated acquisition earn-out payables 126.5 126.5          
Retail              
Business Acquisition [Line Items]              
Increase (decrease) in goodwill   14.9          
Goodwill net   136.0          
National Programs              
Business Acquisition [Line Items]              
Increase (decrease) in goodwill   (23.9)          
Goodwill net   (21.0)          
Wholesale Brokerage              
Business Acquisition [Line Items]              
Increase (decrease) in goodwill   0.0          
Goodwill net   $ 1.8          
Purchased Customer Accounts              
Business Acquisition [Line Items]              
Weighted average life (years)   14 years 9 months 18 days          
Non-compete Agreements              
Business Acquisition [Line Items]              
Weighted average life (years)   4 years 4 months 24 days          
Other Acquisitions              
Business Acquisition [Line Items]              
Net assets acquired 169.7 $ 169.7          
Goodwill 116.8 116.8          
Other Acquisitions | Maximum              
Business Acquisition [Line Items]              
Net assets acquired 50.0 50.0          
GRP Holdco Limited              
Business Acquisition [Line Items]              
Maximum potential earn-out amount $ 0.0 $ 0.0