Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

Financial information relating to our segments for 2017, 2016 and 2015 is as follows (in millions):

Year Ended December 31, 2017	Brokerage			Risk Management			Corporate			Total
Revenues:
Commissions	$	2,627.1		$	—		$	—		$	2,627.1
Fees		868.8			768.0			—			1,636.8
Supplemental revenues		163.7			—			—			163.7
Contingent revenues		111.8			—			—			111.8
Investment income		55.7			0.6			—			56.3
Gains on books of business sales and other		3.4			—			—			3.4
Revenue from clean coal activities		—			—			1,560.5			1,560.5
Total revenues		3,830.5			768.6			1,560.5			6,159.6
Compensation		2,217.2			446.9			88.2			2,752.3
Operating		613.9			189.2			49.4			852.5
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		3,184.0			671.7			1,925.8			5,781.5
Earnings (loss) before income taxes		646.5			96.9			(365.3	)		378.1
Provision (benefit) for income taxes		222.5			37.0			(380.6	)		(121.1	)
Net earnings		424.0			59.9			15.3			499.2
Net earnings attributable to noncontrolling interests		8.1			—			28.0			36.1
Net earnings attributable to controlling interests	$	415.9		$	59.9		$	(12.7	)	$	463.1
Net foreign exchange loss	$	(1.6	)	$	(0.1	)	$	(1.1	)	$	(2.8	)
Revenues:
United States	$	2,537.4		$	639.5		$	1,525.7		$	4,702.6
United Kingdom		686.7			30.9			—			717.6
Australia		192.7			78.2			—			270.9
Canada		150.7			4.7			—			155.4
New Zealand		135.2			15.3			—			150.5
Other foreign		127.8			—			34.8			162.6
Total revenues	$	3,830.5		$	768.6		$	1,560.5		$	6,159.6
At December 31, 2017
Identifiable assets:
United States	$	4,799.6		$	569.5		$	1,799.4		$	7,168.5
United Kingdom		2,620.9			91.3			—			2,712.2
Australia		1,061.7			48.9			—			1,110.6
Canada		726.6			6.8			—			733.4
New Zealand		707.6			18.7			—			726.3
Other foreign		420.0			—			26.4			446.4
Total identifiable assets	$	10,336.4		$	735.2		$	1,825.8		$	12,897.4
Goodwill - net	$	4,152.3		$	42.6		$	3.0		$	4,197.9
Amortizable intangible assets - net		1,630.6			14.0			—			1,644.6

Year Ended December 31, 2016	Brokerage		Risk Management		Corporate			Total
Revenues:
Commissions	$	2,439.1	$	—	$	—		$	2,439.1
Fees		775.7		717.1		—			1,492.8
Supplemental revenues		147.0		—		—			147.0
Contingent revenues		107.2		—		—			107.2
Investment income		52.3		1.0		—			53.3
Gains on books of business sales and other		6.6		—		—			6.6
Revenue from clean coal activities		—		—		1,350.1			1,350.1
Other - net gain		—		—		(1.3	)		(1.3	)
Total revenues		3,527.9		718.1		1,348.8			5,594.8
Compensation		2,041.8		424.5		72.6			2,538.9
Operating		600.9		171.4		25.4			797.7
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		2,976.7		625.6		1,635.6			5,237.9
Earnings (loss) before income taxes		551.2		92.5		(286.8	)		356.9
Provision (benefit) for income taxes		194.1		35.3		(317.5	)		(88.1	)
Net earnings		357.1		57.2		30.7			445.0
Net earnings attributable to noncontrolling interests		3.6		—		27.0			30.6
Net earnings attributable to controlling interests	$	353.5	$	57.2	$	3.7		$	414.4
Net foreign exchange gain	$	2.9	$	—	$	0.1		$	3.0
Revenues:
United States	$	2,334.4	$	610.3	$	1,327.9		$	4,272.6
United Kingdom		686.5		25.6		—			712.1
Australia		172.5		73.0		—			245.5
Canada		134.1		4.1		—			138.2
New Zealand		120.7		5.1		—			125.8
Other foreign		79.7		—		20.9			100.6
Total revenues	$	3,527.9	$	718.1	$	1,348.8		$	5,594.8
At December 31, 2016
Identifiable assets:
United States	$	4,393.6	$	540.5	$	1,622.2		$	6,556.3
United Kingdom		2,321.9		61.8		—			2,383.7
Australia		894.4		56.9		—			951.3
Canada		573.3		2.8		—			576.1
New Zealand		668.9		4.4		—			673.3
Other foreign		331.3		—		17.6			348.9
Total identifiable assets	$	9,183.4	$	666.4	$	1,639.8		$	11,489.6
Goodwill - net	$	3,736.9	$	28.1	$	2.8		$	3,767.8
Amortizable intangible assets - net		1,613.6		13.7		—			1,627.3

Year Ended December 31, 2015	Brokerage			Risk Management			Corporate			Total
Revenues:
Commissions	$	2,338.7		$	—		$	—		$	2,338.7
Fees		705.8			726.5			—			1,432.3
Supplemental revenues		125.5			—			—			125.5
Contingent revenues		93.7			—			—			93.7
Investment income		53.6			0.6			—			54.2
Gains on books of business sales and other		6.7			—			—			6.7
Revenue from clean coal activities		—			—			1,310.8			1,310.8
Other - net gain		—			—			30.5			30.5
Total revenues		3,324.0			727.1			1,341.3			5,392.4
Compensation		1,939.7			427.2			62.0			2,428.9
Operating		638.1			180.8			21.8			840.7
Cost of revenues from clean coal activities		—			—			1,351.5			1,351.5
Interest		—			—			103.0			103.0
Depreciation		54.4			24.3			15.2			93.9
Amortization		237.3			3.0			—			240.3
Change in estimated acquisition earnout payables		41.1			(0.5	)		—			40.6
Total expenses		2,910.6			634.8			1,553.5			5,098.9
Earnings (loss) before income taxes		413.4			92.3			(212.2	)		293.5
Provision (benefit) for income taxes		145.3			35.1			(276.0	)		(95.6	)
Net earnings		268.1			57.2			63.8			389.1
Net earnings attributable to noncontrolling interests		1.7			—			30.6			32.3
Net earnings attributable to controlling interests	$	266.4		$	57.2		$	33.2		$	356.8
Net foreign exchange gain (loss)	$	(0.2	)	$	—		$	0.4		$	0.2
Revenues:
United States	$	2,122.1		$	591.8		$	1,327.5		$	4,041.4
United Kingdom		738.5			28.4			—			766.9
Australia		157.3			99.4			—			256.7
Canada		133.1			3.5			—			136.6
New Zealand		118.6			4.0			—			122.6
Other foreign		54.4			—			13.8			68.2
Total revenues	$	3,324.0		$	727.1		$	1,341.3		$	5,392.4
At December 31, 2015
Identifiable assets:
United States	$	4,092.8		$	525.2		$	1,264.9		$	5,882.9
United Kingdom		2,580.0			72.1			—			2,652.1
Australia		895.8			55.6			—			951.4
Canada		575.0			3.1			—			578.1
New Zealand		623.1			4.1			—			627.2
Other foreign		203.0			—			19.1			222.1
Total identifiable assets	$	8,969.7		$	660.1		$	1,284.0		$	10,913.8
Goodwill - net	$	3,635.6		$	27.3		$	—		$	3,662.9
Amortizable intangible assets - net		1,677.8			21.0			—			1,698.8