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Leases - Additional Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($)
Lessee Lease Description [Line Items] |
Operating lease expiration term | 2043
Future Lease Agreements |
Lessee Lease Description [Line Items] |
Operating lease expected to commence undiscounted lease liabilities in 2020 | $ 11.3
Operating lease expected to commence undiscounted lease liabilities in 2021 | $ 0.6

X
- Definition Lessee operating lease lease not yet commenced undiscounted lease liabilities due in year two + References No definition available. + Details
Name: | bro_LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedLeaseLiabilitiesDueInYearTwo
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee operating lease lease not yet commenced undiscounted lease liabilities remainder of fiscal year. + References No definition available. + Details
Name: | bro_LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedLeaseLiabilitiesRemainderOfFiscalYear
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum operating lease expiration term. + References No definition available. + Details
Name: | bro_MaximumOperatingLeaseExpirationTerm
Namespace Prefix: | bro_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=bro_FutureLeaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |