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v3.21.1

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Installment | Dec. 31, 2020 USD ($)
Supplemental Cash Flow Elements [Abstract] |  |
Deferred employer only payroll tax payments, CARES Act | $ | $ 0 | $ 31,100,000
Number of installment in cumulative deferred employer payroll taxes to be paid, CARES Act | Installment | 2 |

X
- Definition Number of installment in cumulative deferred employer payroll taxes to be paid, CARES Act. + References No definition available. + Details
Name: | bro_NumberOfInstallmentInCumulativeDeferredEmployerPayrollTaxesToBePaidCARESAct
Namespace Prefix: | bro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Social security tax, employer, deferral, CARES Act. + References No definition available. + Details
Name: | bro_SocialSecurityTaxEmployerDeferralCARESAct
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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