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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 22, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Registrant Name BROWN & BROWN, INC.    
Entity Central Index Key 0000079282    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   282,089,166  
Entity Public Float     $ 9,600,807,597
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Title of 12(b) Security COMMON STOCK, $0.10 PAR VALUE    
Trading Symbol BRO    
Security Exchange Name NYSE    
Entity File Number 001-13619    
Entity Incorporation, State or Country Code FL    
Entity Tax Identification Number 59-0864469    
Entity Address, Address Line One 300 North Beach Street    
Entity Address, City or Town Daytona Beach    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 32114    
City Area Code 386    
Local Phone Number 252-9601    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of Brown & Brown, Inc.’s Proxy Statement for the 2021 Annual Meeting of Shareholders are incorporated by reference into Part III of this Report.