Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

Financial information relating to our segments for 2018, 2017 and 2016 is as follows (in millions):

Year Ended December 31, 2018	Brokerage		Risk Management			Corporate			Total
Revenues:
Commissions	$	2,920.7	$	—		$	—		$	2,920.7
Fees		958.5		797.8			—			1,756.3
Supplemental revenues		189.9		—			—			189.9
Contingent revenues		98.0		—			—			98.0
Investment income		69.6		0.5			—			70.1
Gains on books of business sales		10.2		—			—			10.2
Revenue from clean coal activities		—		—			1,746.3			1,746.3
Other net revenues		—		—			0.9			0.9
Revenues before reimbursements		4,246.9		798.3			1,747.2			6,792.4
Reimbursements		—		141.6			—			141.6
Total revenues		4,246.9		939.9			1,747.2			6,934.0
Compensation		2,447.1		489.7			89.5			3,026.3
Operating		673.5		174.6			55.6			903.7
Reimbursements		—		141.6			—			141.6
Cost of revenues from clean coal activities		—		—			1,816.0			1,816.0
Interest		—		—			138.4			138.4
Depreciation		60.9		38.7			28.2			127.8
Amortization		286.9		4.3			—			291.2
Change in estimated acquisition earnout payables		14.3		(4.7	)		—			9.6
Total expenses		3,482.7		844.2			2,127.7			6,454.6
Earnings (loss) before income taxes		764.2		95.7			(380.5	)		479.4
Provision (benefit) for income taxes		191.0		25.3			(412.8	)		(196.5	)
Net earnings		573.2		70.4			32.3			675.9
Net earnings attributable to noncontrolling interests		10.7		—			31.7			42.4
Net earnings attributable to controlling interests	$	562.5	$	70.4		$	0.6		$	633.5
Net foreign exchange gain	$	—	$	—		$	2.9		$	2.9
Revenues:
United States	$	2,840.9	$	789.7		$	1,747.2		$	5,377.8
United Kingdom		738.5		35.4			—			773.9
Australia		195.9		94.7			—			290.6
Canada		181.1		4.3			—			185.4
New Zealand		141.7		15.8			—			157.5
Other foreign		148.8		—			—			148.8
Total revenues	$	4,246.9	$	939.9		$	1,747.2		$	6,934.0
At December 31, 2018
Identifiable assets:
United States	$	6,865.4	$	571.4		$	1,800.8		$	9,237.6
United Kingdom		3,758.5		103.8			—			3,862.3
Australia		1,096.1		47.2			—			1,143.3
Canada		783.1		4.4			—			787.5
New Zealand		688.5		21.3			—			709.8
Other foreign		593.5		—			—			593.5
Total identifiable assets	$	13,785.1	$	748.1		$	1,800.8		$	16,334.0
Goodwill - net	$	4,573.7	$	49.2		$	2.7		$	4,625.6
Amortizable intangible assets - net		1,753.7		19.3			—			1,773.0

Year Ended December 31, 2017, as restated	Brokerage			Risk Management			Corporate			Total
Revenues:
Commissions	$	2,641.0		$	—		$	—		$	2,641.0
Fees		855.1			736.8			—			1,591.9
Supplemental revenues		158.0			—			—			158.0
Contingent revenues		99.5			—			—			99.5
Investment income		58.1			0.6			—			58.7
Gains on books of business sales		3.4			—			—			3.4
Revenue from clean coal activities		—			—			1,560.5			1,560.5
Revenues before reimbursements		3,815.1			737.4			1,560.5			6,113.0
Reimbursements		—			136.0			—			136.0
Total revenues		3,815.1			873.4			1,560.5			6,249.0
Compensation		2,212.3			446.9			88.2			2,747.4
Operating		614.0			164.8			50.3			829.1
Reimbursements		—			136.0			—			136.0
Cost of revenues from clean coal activities		—			—			1,635.9			1,635.9
Interest		—			—			124.1			124.1
Depreciation		61.8			31.1			28.2			121.1
Amortization		261.8			2.9			—			264.7
Change in estimated acquisition earnout payables		29.3			1.6			—			30.9
Total expenses		3,179.2			783.3			1,926.7			5,889.2
Earnings (loss) before income taxes		635.9			90.1			(366.2	)		359.8
Provision (benefit) for income taxes		221.2			34.4			(412.7	)		(157.1	)
Net earnings		414.7			55.7			46.5			516.9
Net earnings attributable to noncontrolling interests		7.6			—			28.0			35.6
Net earnings attributable to controlling interests	$	407.1		$	55.7		$	18.5		$	481.3
Net foreign exchange loss	$	(2.0	)	$	(0.1	)	$	(1.8	)	$	(3.9	)
Revenues:
United States	$	2,533.7		$	745.1		$	1,560.5		$	4,839.3
United Kingdom		679.3			30.6			—			709.9
Australia		191.1			78.2			—			269.3
Canada		149.4			4.2			—			153.6
New Zealand		134.4			15.3			—			149.7
Other foreign		127.2			—			—			127.2
Total revenues	$	3,815.1		$	873.4		$	1,560.5		$	6,249.0
At December 31, 2017
Identifiable assets:
United States	$	5,890.5		$	572.9		$	1,766.8		$	8,230.2
United Kingdom		3,496.2			91.3			—			3,587.5
Australia		1,102.9			48.9			—			1,151.8
Canada		743.3			6.8			—			750.1
New Zealand		709.9			18.7			—			728.6
Other foreign		461.5			—			—			461.5
Total identifiable assets	$	12,404.3		$	738.6		$	1,766.8		$	14,909.7
Goodwill - net	$	4,119.2		$	42.6		$	3.0		$	4,164.8
Amortizable intangible assets - net		1,630.6			14.0			—			1,644.6

Year Ended December 31, 2016, as restated	Brokerage		Risk Management		Corporate			Total
Revenues:
Commissions	$	2,409.9	$	—	$	—		$	2,409.9
Fees		794.7		697.0		—			1,491.7
Supplemental revenues		139.9		—		—			139.9
Contingent revenues		97.9		—		—			97.9
Investment income		52.6		1.0		—			53.6
Gains on books of business sales		6.6		—		—			6.6
Revenue from clean coal activities		—		—		1,350.1			1,350.1
Other net losses		—		—		(1.3	)		(1.3	)
Revenues before reimbursements		3,501.6		698.0		1,348.8			5,548.4
Reimbursements		—		132.1		—			132.1
Total revenues		3,501.6		830.1		1,348.8			5,680.5
Compensation		2,040.2		424.4		72.6			2,537.2
Operating		598.2		152.7		25.4			776.3
Reimbursements		—		132.1		—			132.1
Cost of revenues from clean coal activities		—		—		1,408.6			1,408.6
Interest		—		—		109.8			109.8
Depreciation		57.2		27.2		19.2			103.6
Amortization		244.7		2.5		—			247.2
Change in estimated acquisition earnout payables		32.1		—		—			32.1
Total expenses		2,972.4		738.9		1,635.6			5,346.9
Earnings (loss) before income taxes		529.2		91.2		(286.8	)		333.6
Provision (benefit) for income taxes		186.6		34.5		(317.8	)		(96.7	)
Net earnings		342.6		56.7		31.0			430.3
Net earnings attributable to noncontrolling interests		6.5		—		27.0			33.5
Net earnings attributable to controlling interests	$	336.1	$	56.7	$	4.0		$	396.8
Net foreign exchange gain	$	5.2	$	—	$	0.1		$	5.3
Revenues:
United States	$	2,319.3	$	721.1	$	1,348.8		$	4,389.2
United Kingdom		661.5		26.8		—			688.3
Australia		170.0		73.0		—			243.0
Canada		132.4		4.1		—			136.5
New Zealand		120.4		5.1		—			125.5
Other foreign		98.0		—		—			98.0
Total revenues	$	3,501.6	$	830.1	$	1,348.8		$	5,680.5
At December 31, 2016
Identifiable assets:
United States	$	5,545.1	$	545.0	$	1,548.7		$	7,638.8
United Kingdom		3,172.9		61.8		—			3,234.7
Australia		931.8		56.9		—			988.7
Canada		584.2		2.8		—			587.0
New Zealand		672.0		4.4		—			676.4
Other foreign		402.6		—		—			402.6
Total identifiable assets	$	11,308.6	$	670.9	$	1,548.7		$	13,528.2
Goodwill - net	$	3,722.3	$	28.1	$	2.8		$	3,753.2
Amortizable intangible assets - net		1,613.6		13.7		—			1,627.3