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v3.23.1

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Supplemental Cash Flow Elements [Abstract] |  |
Effect of foreign exchange rate changes on cash and cash equivalents inclusive of fiduciary cash | $ 14.3 | $ (0.3)

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- Definition Effect of foreign exchange rate cash changes in cash and cash equivalents inclusive of fiduciary. + References No definition available. + Details
Name: | bro_EffectOfForeignExchangeRateCashChangesInCashAndCashEquivalentsInclusiveOfFiduciary
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration