Schedule II. Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II. Valuation and Qualifying Accounts

Schedule II

Arthur J. Gallagher & Co.

Valuation and Qualifying Accounts

	Balance at Beginning of Year		Amounts Recorded in Earnings			Adjustments				Balance at End of Year
	(In millions)
Year ended December 31, 2023
Allowance for doubtful accounts	$	11.1	$	26.0		$	(14.1	)	(1)	$	23.0
Allowance for estimated policy cancellations		9.3		(0.5	)		1.1		(2)		9.9
Valuation allowance for deferred tax assets		135.2		60.6			—				195.8
Accumulated amortization of expiration
lists, non-compete agreements and trade names		3,300.0		531.3			42.2		(3)		3,873.5
Year ended December 31, 2022
Allowance for doubtful accounts	$	8.3	$	6.8		$	(4.0	)	(1)	$	11.1
Allowance for estimated policy cancellations		10.0		2.4			(3.1	)	(2)		9.3
Valuation allowance for deferred tax assets		154.9		(19.7	)		—				135.2
Accumulated amortization of expiration
lists, non-compete agreements and trade names		2,924.0		454.9			(78.9	)	(3)		3,300.0
Year ended December 31, 2021
Allowance for doubtful accounts	$	10.1	$	7.0		$	(8.8	)	(1)	$	8.3
Allowance for estimated policy cancellations		9.9		(1.3	)		1.4		(2)		10.0
Valuation allowance for deferred tax assets		94.9		60.0			—				154.9
Accumulated amortization of expiration
lists, non-compete agreements and trade names		2,537.0		415.1			(28.1	)	(3)		2,924.0

(1)Net activity of bad debt write offs and recoveries and acquired businesses.

(2)Additions to allowance related to acquired businesses.

(3)Elimination of fully amortized expiration lists, non-compete agreements and trade names, intangible asset/amortization reclassifications and disposal of acquired businesses.