Debt Instruments Maturity Year

No definition available.

Name:	bro_DebtInstrumentsMaturityYear
Namespace Prefix:	bro_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility, expiration term.

+ References

No definition available.

+ Details

Name:	bro_LineOfCreditFacilityExpirationTerm
Namespace Prefix:	bro_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FourPointTwoZeroZeroPercentSeniorNotesDueTwoThousandTwentyFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FourPointFiveZeroZeroPercentSeniorNotesDueTwoThousandTwentyNineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_TwoPointThreeSevenFivePercentSeniorNotesDueTwoThousandThirtyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FourPointTwoZeroZeroPercentSeniorNotesDueTwoThousandThirtyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FourPointNineFiveZeroPercentSeniorNotesDueTwoThousandFiftyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FiveYearTermLoanFacilityExpiresInTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FiveYearRevolvingLoanFacilityExpiresInTwoThousandTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FiveYearTermLoanFacilityExpiresInTwoThousandTwentyThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_ThreeYearTermLoanFacilityExpiresInTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bro_FiveYearTermLoanFacilityExpiresInTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 17, 2022
4.200% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2024
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.20%	4.20%
Debt instrument maturity year	2024	2024
4.500% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2029
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.50%	4.50%
Debt instrument maturity year	2029	2029
2.375% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2031
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	2.375%	2.375%
Debt instrument maturity year	2031	2031
4.200% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2032
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.20%	4.20%	4.20%
Debt instrument maturity year	2032	2032
4.950% Senior Notes, Semi-Annual Interest Payments, Net of the Unamortized Discount, Balloon Due 2052
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.95%	4.95%	4.95%
Debt instrument maturity year	2052	2052
5-year Term Loan Facility Expires in 2026
Debt Instrument [Line Items]
Debt instrument maturity year	2026	2026
Line of credit facility, expiration term	5 years	5 years
Line of credit facility, expiration date	Oct. 27, 2026	Oct. 27, 2026
5-year Term Loan Facility Expires in 2026 \| Maximum \| LIBOR
Debt Instrument [Line Items]
Debt instrument, variable interest rate		1.75%
5-year Term Loan Facility Expires in 2026 \| Maximum \| SOFR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.75%
5-year Revolving Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.525%, Plus Commitment Fees up to 0.225%, Expires October 27, 2026
Debt Instrument [Line Items]
Line of credit facility, expiration term	5 years
Line of credit facility, expiration date	Oct. 27, 2026
5-year Revolving Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.525%, Plus Commitment Fees up to 0.225%, Expires October 27, 2026 \| Maximum
Debt Instrument [Line Items]
Commitment fee, percentage	0.225%
5-year Revolving Loan Facility, Periodic Interest Payments, LIBOR Plus up to 1.525%, Plus Commitment Fees up to 0.225%, Expires October 27, 2026 \| Maximum \| SOFR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.525%
5-year Term Loan Facility Expires in 2023
Debt Instrument [Line Items]
Debt instrument maturity year	2023	2023
Line of credit facility, expiration term	5 years	5 years
3-year Term Loan Facility Expires in 2025
Debt Instrument [Line Items]
Line of credit facility, expiration term	3 years
Line of credit facility, expiration date	Mar. 31, 2025
3-year Term Loan Facility Expires in 2025 \| Maximum \| SOFR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.625%
5-year Term Loan Facility Expires in 2027
Debt Instrument [Line Items]
Debt instrument maturity year	2027	2027
Line of credit facility, expiration term	5 years	5 years
Line of credit facility, expiration date	Mar. 31, 2027
5-year Term Loan Facility Expires in 2027 \| Maximum \| SOFR
Debt Instrument [Line Items]
Debt instrument, variable interest rate	1.75%