Schedule II. Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2021

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, 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
Year ended December 31, 2020
Allowance for doubtful accounts	$	8.7	$	6.6		$	(5.2	)	(1)	$	10.1
Allowance for estimated policy cancellations		8.3		4.1			(2.5	)	(2)		9.9
Valuation allowance for deferred tax assets		80.5		14.4			—				94.9
Accumulated amortization of expiration
lists, non-compete agreements and trade names		2,087.5		417.3			32.2		(3)		2,537.0
Year ended December 31, 2019
Allowance for doubtful accounts	$	10.0	$	4.2		$	(5.5	)	(1)	$	8.7
Allowance for estimated policy cancellations		7.8		0.5			—		(2)		8.3
Valuation allowance for deferred tax assets		67.4		13.1			—				80.5
Accumulated amortization of expiration
lists, non-compete agreements and trade names		1,750.4		334.0			3.1		(3)		2,087.5

(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.