We have three reportable operating segments: brokerage, risk management and corporate.

The brokerage segment is primarily comprised of our retail and wholesale insurance brokerage operations. The brokerage segment generates revenues through commissions paid by underwriting enterprises and through fees charged to our clients. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients and we do not assume net underwriting risks.

The risk management segment provides contract claim settlement and administration services for enterprises and public entities that choose to self-insure some or all of their property/casualty coverages and for underwriting enterprises that choose to outsource some or all of their property/casualty claims departments. These operations also provide claims management, loss control consulting and insurance property appraisal services. Revenues are principally generated on a negotiated

per-claim

per-service

fee basis. Our risk management segment also provides risk management consulting services that are recognized as the services are delivered.

The corporate segment manages our clean energy and other investments. In addition, the corporate segment reports the financial information related to our debt and other corporate costs, external acquisition-related expenses and the impact of foreign currency translation.

Allocations of investment income and certain expenses are based on reasonable assumptions and estimates primarily using revenue, headcount and other information. During the three-month period ended June 30, 2019, we reviewed our allocation of corporate costs to our business segments. In conjunction with that review, we made some changes to how we allocate certain costs to our business segments reflecting management’s updated view of the costs necessary to support these segments. This change resulted in additional costs being allocated to the business segments, the amounts of which were less than

% of the corporate segment’s loss before income taxes for the nine-month period ended September 30, 2019 and were not significant to each of the business segments. We allocate the provision for income taxes to the brokerage and risk management segments using the local country statutory rates. Reported operating results by segment would change if different methods were applied.

Financial information relating to our segments for the three-month and nine-month periods ended September 30, 2019 and 2018 is as follows (in millions):


	Three-month period ended September 30,						Nine-month period ended September 30,
	2019			2018			2019			2018
Brokerage
Total revenues	$	1,195.9		$	1,049.4		$	3,709.0		$	3,245.1

Earnings before income taxes	$	199.9		$	163.2		$	794.6		$	652.7

Identifiable assets at September 30, 2019 and 2018							$	16,261.6		$	13,700.7

Risk Management
Total revenues	$	246.3		$	236.4		$	724.8		$	703.6

Earnings before income taxes	$	21.7		$	22.3		$	64.7		$	67.9

Identifiable assets at September 30, 2019 and 2018							$	920.8		$	748.3

Corporate
Total revenues	$	383.0		$	492.7		$	1,039.8		$	1,327.9

Loss before income taxes	$	(106.8	)	$	(95.2	)	$	(317.2	)	$	(284.4	)

Identifiable assets at September 30, 2019 and 2018							$	1,991.4		$	1,665.7
Total
Total revenues	$	1,825.2		$	1,778.5		$	5,473.6		$	5,276.6
Earnings before income taxes	$	114.8		$	90.3		$	542.1		$	436.2
Identifiable assets at September 30, 2019 and 2018							$	19,173.8		$	16,114.7

Disaggregation of Revenue

We disaggregate our revenue from contracts with clients by type and geographic location for each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.

Revenues by type and segment for the three-month period ended September 30, 2019 are as follows (in millions):


	Brokerage		Risk Management		Corporate			Total
Revenues:
Commissions	$	809.9	$	—	$	—		$	809.9
Fees		278.9		211.2		—			490.1
Supplemental revenues		49.8		—		—			49.8
Contingent revenues		30.4		—		—			30.4
Investment income		23.6		0.4		—			24.0
Net gains on divestitures		3.3		—		—			3.3
Revenues from clean coal activities		—		—		386.0			386.0
Other net losses		—		—		(3.0	)		(3.0	)

Revenues before reimbursements		1,195.9		211.6		383.0			1,790.5
Reimbursements		—		34.7		—			34.7

Total revenues	$	1,195.9	$	246.3	$	383.0		$	1,825.2

Revenues by type and segment for the nine-month period ended September 30, 2019 are as follows (in millions):


	Brokerage		Risk Management		Corporate			Total
Revenues:
Commissions	$	2,528.0	$	—	$	—		$	2,528.0
Fees		796.8		622.7		—			1,419.5
Supplemental revenues		153.4		—		—			153.4
Contingent revenues		107.9		—		—			107.9
Investment income		60.6		1.3		—			61.9
Net gains on divestitures		62.3		—		—			62.3
Revenues from clean coal activities		—		—		1,042.7			1,042.7
Other net losses		—		—		(2.9	)		(2.9	)

Revenues before reimbursements		3,709.0		624.0		1,039.8			5,372.8
Reimbursements		—		100.8		—			100.8

Total revenues	$	3,709.0	$	724.8	$	1,039.8		$	5,473.6

Revenues by geographical location and segment for the three-month period ended September 30, 2019 are as follows (in millions):


	Brokerage		Risk Management		Corporate		Total
Revenues:
United States	$	795.9	$	208.6	$	383.0	$	1,387.5
United Kingdom		221.8		10.4		—		232.2
Australia		52.9		22.5		—		75.4
Canada		52.6		1.0		—		53.6
New Zealand		36.1		3.8		—		39.9
Other foreign		36.6		—		—		36.6

Total revenues	$	1,195.9	$	246.3	$	383.0	$	1,825.2

Revenues by geographical location and segment for the nine-month period ended September 30, 2019 are as follows (in millions):


	Brokerage		Risk Management		Corporate		Total
Revenues:
United States	$	2,487.6	$	614.0	$	1,039.8	$	4,141.4
United Kingdom		674.2		30.6		—		704.8
Australia		157.7		65.0		—		222.7
Canada		168.2		3.3		—		171.5
New Zealand		107.7		11.9		—		119.6
Other foreign		113.6		—		—		113.6

Total revenues	$	3,709.0	$	724.8	$	1,039.8	$	5,473.6

Revenues by type and segment for the three-month period ended September 30, 2018 are as follows (in millions):


	Brokerage		Risk Management		Corporate		Total
Revenues:
Commissions	$	707.6	$	—	$	—	$	707.6
Fees		253.7		199.0		—		452.7
Supplemental revenues		43.9		—		—		43.9
Contingent revenues		25.7		—		—		25.7
Investment income		17.9		0.1		—		18.0
Net gains on divestitures		0.6		—		—		0.6
Revenues from clean coal activities		—		—		492.4		492.4
Other net revenues		—		—		0.3		0.3

Revenues before reimbursements		1,049.4		199.1		492.7		1,741.2
Reimbursements		—		37.3		—		37.3

Total revenues	$	1,049.4	$	236.4	$	492.7	$	1,778.5

Revenues by type and segment for the nine-month period ended September 30, 2018 are as follows (in millions):


	Brokerage		Risk Management		Corporate		Total
Revenues:
Commissions	$	2,235.0	$	—	$	—	$	2,235.0
Fees		727.3		595.7		—		1,323.0
Supplemental revenues		144.0		—		—		144.0
Contingent revenues		82.4		—		—		82.4
Investment income		46.8		0.4		—		47.2
Net gains on divestitures		9.6		—		—		9.6
Revenues from clean coal activities		—		—		1,327.0		1,327.0
Other net revenues		—		—		0.9		0.9

Revenues before reimbursements		3,245.1		596.1		1,327.9		5,169.1
Reimbursements		—		107.5		—		107.5

Total revenues	$	3,245.1	$	703.6	$	1,327.9	$	5,276.6

Revenues by geographical location and segment for the three-month period ended September 30, 2018 are as follows (in millions):


	Brokerage		Risk Management		Corporate		Total
Revenues:
United States	$	724.2	$	201.5	$	492.7	$	1,418.4
United Kingdom		169.3		8.7		—		178.0
Australia		49.1		21.1		—		70.2
Canada		40.3		0.9		—		41.2
New Zealand		35.0		4.2		—		39.2
Other foreign		31.5		—		—		31.5

Total revenues	$	1,049.4	$	236.4	$	492.7	$	1,778.5

Revenues by geographical location and segment for the nine-month period ended September 30, 2018 are as follows (in millions):


	Brokerage		Risk Management		Corporate		Total
Revenues:
United States	$	2,192.5	$	591.6	$	1,327.9	$	4,112.0
United Kingdom		564.6		26.5		—		591.1
Australia		146.6		70.5		—		217.1
Canada		130.9		3.0		—		133.9
New Zealand		104.5		12.0		—		116.5
Other foreign		106.0		—		—		106.0

Total revenues	$	3,245.1	$	703.6	$	1,327.9	$	5,276.6