Business Combinations (Tables)

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Acquisition Method for Recording Business Combinations

During 2019, we acquired substantially all of the net assets of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions, except share data):

Name and Effective Date of Acquisition	Common Shares Issued		Common Share Value		Cash Paid		Accrued Liability		Escrow Deposited		Recorded Earnout Payable		Total Recorded Purchase Price		Maximum Potential Earnout Payable
	(000s)
Inversion Holding Company, LLC (IHC) January 1, 2019		452	$	35.9	$	31.2	$	—	$	4.5	$	20.8	$	92.4	$	35.0
Jones Brown Inc. (JBI) January 1, 2019		—		—		65.9		—		8.7		—		74.6		—
Stackhouse Poland Group Limited (SPG) April 5, 2019		—		—		326.8		—		4.8		—		331.6		—
RPA Insurance Services LLC (RPA) May 1, 2019		—		—		44.0		—		3.9		16.9		64.8		22.0
JLT Aerospace (JLT) June 1, 2019		—		—		162.8		—		—		67.9		230.7		75.1
RGA Group (RGA) September 4, 2019		—		—		42.8		6.0		4.7		8.0		61.5		9.3
LSG Insurance Partners, Inc. (LSG) October 1, 2019		395		36.2		127.2		—		6.0		50.1		219.5		71.5
The EHE Group, LLC dba BonusDrive (EHE) November 1, 2019		458		42.0		41.0		0.2		1.0		27.0		111.2		77.0
Horseshoe Insurance Services Holdings, Ltd. (HIS) November 15, 2019		—		—		43.3		8.5		5.0		7.1		63.9		10.0
40 other acquisitions completed in 2019		482		41.8		389.5		1.7		34.2		74.4		541.6		177.2
		1,787	$	155.9	$	1,274.5	$	16.4	$	72.8	$	272.2	$	1,791.8	$	477.1

Summary of Estimated Fair Values of Net Assets Acquired

The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in 2019 (in millions):

																			40 Other
	IHC		JBI		SPG		RPA		JLT		RGA		LSG		EHE		HIS		Acquisitions		Total
Cash	$	—	$	2.7	$	13.6	$	—	$	—	$	6.0	$	—	$	2.6	$	8.9	$	11.7	$	45.5
Other current assets		3.8		22.2		35.9		10.6		6.7		5.1		6.6		4.2		2.6		69.8		167.5
Fixed assets		0.3		1.1		3.1		0.2		—		0.2		0.7		0.1		1.5		3.3		10.5
Noncurrent assets		0.5		2.9		9.9		0.7		3.3		5.7		—		0.1		1.9		13.6		38.6
Goodwill		41.5		49.5		255.9		34.5		127.1		36.7		126.0		50.2		10.0		244.3		975.7
Expiration lists		51.7		25.4		123.0		32.6		105.1		19.5		94.3		67.5		39.8		282.4		841.3
Non-compete agreements		0.2		0.1		0.5		0.1		0.3		2.7		0.5		0.8		2.9		3.6		11.7
Trade names		—		0.1		0.2		—		0.7		—		—		—		2.9		0.1		4.0
Total assets acquired		98.0		104.0		442.1		78.7		243.2		75.9		228.1		125.5		70.5		628.8		2,094.8
Current liabilities		5.1		20.4		76.7		13.2		12.5		10.6		8.6		2.4		6.6		61.8		217.9
Noncurrent liabilities		0.5		9.0		33.8		0.7		—		3.8		—		11.9		—		25.4		85.1
Total liabilities assumed		5.6		29.4		110.5		13.9		12.5		14.4		8.6		14.3		6.6		87.2		303.0
Total net assets acquired	$	92.4	$	74.6	$	331.6	$	64.8	$	230.7	$	61.5	$	219.5	$	111.2	$	63.9	$	541.6	$	1,791.8

Summary of Unaudited Pro Forma Historical Results

The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2018 (in millions, except per share data):

	Year Ended December 31,
	2019		2018
Total revenues	$	7,390.5	$	7,383.1
Net earnings attributable to controlling interests		669.1		659.3
Basic earnings per share		3.57		3.57
Diluted earnings per share		3.50		3.51