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Document and Entity Information
Dec. 01, 2021
Cover [Abstract]  
Amendment Flag true
Entity Central Index Key 0000354190
Document Type 8-K/A
Document Period End Date Dec. 01, 2021
Entity Registrant Name ARTHUR J. GALLAGHER & CO.
Entity Incorporation State Country Code DE
Entity File Number 1-09761
Entity Tax Identification Number 36-2151613
Entity Address, Address Line One 2850 W. Golf Road
Entity Address, City or Town Rolling Meadows
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60008-4050
City Area Code (630)
Local Phone Number 773-3800
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $1.00 par value
Trading Symbol AJG
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Description On December 1, 2021, Arthur J. Gallagher & Co. (the “Company”) filed a Current Report on Form 8-K (the “Original Form 8-K”) to report the completion of an acquisition by the Company of the treaty reinsurance brokerage operations of Willis Towers Watson plc (the “Seller” and such acquired treaty reinsurance brokerage operations, “Willis Re DivestCo”), pursuant to a Security and Asset Purchase Agreement entered into on August 12, 2021 and amended on December 1, 2021 between the Company and the Seller. This amendment to the Original Form 8-K is being filed to provide financial statements of Willis Re DivestCo and pro forma financial information as required by Item 9.01 of Form 8-K.