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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 10.1	$ 4.5	$ 17.7	$ 8.1
Unvested restricted shares of Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards that vested in period			$ 9.6	$ 3.9
Minimum \| BRP Group, Inc. Omnibus Incentive and Partnership Inducement Award Plans \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Minimum \| BRP Group, Inc. Omnibus Incentive and Partnership Inducement Award Plans \| Ratable Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Maximum \| BRP Group, Inc. Omnibus Incentive and Partnership Inducement Award Plans \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
Maximum \| BRP Group, Inc. Omnibus Incentive and Partnership Inducement Award Plans \| Ratable Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Common Class A \| Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards authorized by Plan (in shares)	6,142,862		6,142,862
Common Class A \| BRP Group, Inc. Partnership Inducement Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards authorized by Plan (in shares)	3,000,000		3,000,000