Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2020

Revenue From Contract With Customer [Abstract]

Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers

Information about unbilled receivables, contract assets and contract liabilities from contracts with customers is as follows (in millions):

	June 30, 2020		December 31, 2019
Unbilled receivables	$	736.7	$	556.4
Deferred contract costs		70.1		98.3
Deferred revenue		519.6		503.8

Summary of Changes in Deferred Revenue Balances

Significant changes in the deferred revenue balances, which include foreign currency translation adjustments, during the period are as follows (in millions):

				Risk
	Brokerage			Management			Total
Deferred revenue at December 31, 2019	$	337.2		$	166.6		$	503.8
Incremental deferred revenue		230.4			77.4			307.8
Revenue recognized during the six-month period ended June 30, 2020 included in deferred revenue at December 31, 2019		(214.2	)		(75.6	)		(289.8	)
Impact of change in foreign exchange rates		(6.2	)		—			(6.2	)
Deferred revenue recognized from business acquisitions		4.0			—			4.0
Deferred revenue at June 30, 2020	$	351.2		$	168.4		$	519.6

Summary of Expected Revenue Related to Performance Obligations

The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period is as follows (in millions):

	Brokerage		Risk Management		Total
2020 (remaining six months)	$	263.4	$	78.7	$	342.1
2021		79.1		41.2		120.3
2022		6.7		23.1		29.8
2023		1.0		10.5		11.5
2024		0.5		5.1		5.6
Thereafter		0.5		9.8		10.3
Total	$	351.2	$	168.4	$	519.6