Goodwill (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill by Reportable Segment

The changes in the carrying value of goodwill by reportable segment for the years ended December 31, are as follows:

(in millions)	Retail			National Programs			Wholesale Brokerage			Services			Total
Balance as of January 1, 2022	$	2,987.2		$	1,089.9		$	488.4		$	171.3		$	4,736.8
Goodwill of acquired businesses		1,366.6			516.5			111.4			—			1,994.5
Goodwill disposed of relating to sales of businesses		(38.5	)		—			(7.7	)		—			(46.2	)
Foreign currency translation adjustments during the year		(6.3	)		(4.0	)		(0.6	)		—			(10.9	)
Balance as of December 31, 2022	$	4,309.0		$	1,602.4		$	591.5		$	171.3		$	6,674.2
Goodwill adjustment during measurement period (1)		13.1			(23.5	)		(1.6	)		—			(12.0	)
Goodwill of acquired businesses		335.4			262.5			22.8			—			620.7
Goodwill disposed of relating to sales of businesses		(0.2	)		(2.7	)		—			(44.0	)		(46.9	)
Foreign currency translation adjustments during the year		84.8			14.3			5.7			—			104.8
Balance as of December 31, 2023	$	4,742.1		$	1,853.0		$	618.4		$	127.3		$	7,340.8

(1)Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed and finalized within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments. As of December 31, 2023, adjustments were made to the amounts initially recorded for deferred tax liabilities, purchased customer accounts, other current assets and goodwill. See also Note 3.