Revenue (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following tables disaggregate revenue by reportable segment and service line (in millions):

		Three Months Ended June 30, 2020
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	945.8	$	102.5	$	214.3	$	1,262.6
Leasing	At a point in time	193.4		41.5		32.3		267.2
Capital markets	At a point in time	75.9		24.0		13.3		113.2
Valuation and other	At a point in time or over time	33.4		37.1		30.1		100.6
Total revenue		$	1,248.5	$	205.1	$	290.0	$	1,743.6

		Three Months Ended June 30, 2019
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	892.5	$	95.8	$	292.5	$	1,280.8
Leasing	At a point in time	389.0		57.0		45.7		491.7
Capital markets	At a point in time	170.9		33.2		33.1		237.2
Valuation and other	At a point in time or over time	40.5		42.9		28.6		112.0
Total revenue		$	1,492.9	$	228.9	$	399.9	$	2,121.7

		Six Months Ended June 30, 2020
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	1,912.1	$	209.1	$	442.6	$	2,563.8
Leasing	At a point in time	435.5		82.3		55.1		572.9
Capital markets	At a point in time	223.2		45.6		27.3		296.1
Valuation and other	At a point in time or over time	72.5		78.1		55.6		206.2
Total revenue		$	2,643.3	$	415.1	$	580.6	$	3,639.0

		Six Months Ended June 30, 2019
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	1,761.8	$	183.7	$	568.2	$	2,513.7
Leasing	At a point in time	689.1		105.9		72.5		867.5
Capital markets	At a point in time	312.0		59.6		57.0		428.6
Valuation and other	At a point in time or over time	77.6		82.3		55.0		214.9
Total revenue		$	2,840.5	$	431.5	$	752.7	$	4,024.7