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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Parenthetical) (Details) $ in Millions	Mar. 31, 2025 USD ($)
Business Combination, Separately Recognized Transactions [Line Items]
Total consideration	$ 96
Other Acquisitions [Member] | Maximum [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Total consideration	$ 50

X

- Definition

Business combination consideration.

+ References

No definition available.

+ Details

Name:	bro_BusinessCombinationConsideration
Namespace Prefix:	bro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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_BusinessCombinationSeparatelyRecognizedTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bro_OtherAcquisitionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: