Revenue (Tables)

9 Months Ended

Sep. 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 September 30, 2020
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	1,007.7	$	117.1	$	222.3	$	1,347.1
Leasing	At a point in time	245.6		44.0		33.9		323.5
Capital markets	At a point in time	124.2		24.0		7.7		155.9
Valuation and other	At a point in time or over time	38.6		38.1		28.4		105.1
Total revenue		$	1,416.1	$	223.2	$	292.3	$	1,931.6

		Three Months Ended September 30, 2019
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	906.1	$	96.6	$	283.4	$	1,286.1
Leasing	At a point in time	375.6		56.0		42.6		474.2
Capital markets	At a point in time	182.8		41.7		14.8		239.3
Valuation and other	At a point in time or over time	48.3		41.2		29.7		119.2
Total revenue		$	1,512.8	$	235.5	$	370.5	$	2,118.8

		Nine Months Ended September 30, 2020
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	2,919.8	$	326.2	$	664.9	$	3,910.9
Leasing	At a point in time	681.1		126.3		89.0		896.4
Capital markets	At a point in time	347.4		69.6		35.0		452.0
Valuation and other	At a point in time or over time	111.1		116.2		84.0		311.3
Total revenue		$	4,059.4	$	638.3	$	872.9	$	5,570.6

		Nine Months Ended September 30, 2019
	Revenue recognition timing	Americas		EMEA		APAC		Total
Property, facilities and project management	Over time	$	2,667.9	$	280.3	$	851.6	$	3,799.8
Leasing	At a point in time	1,064.7		161.9		115.1		1,341.7
Capital markets	At a point in time	494.8		101.3		71.8		667.9
Valuation and other	At a point in time or over time	125.9		123.5		84.7		334.1
Total revenue		$	4,353.3	$	667.0	$	1,123.2	$	6,143.5