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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment revenue:
Revenue Before Reimbursements	$ 2,091.4	$ 2,545.8	$ 6,152.9	$ 6,855.6
Revenue	3,978.1	4,495.6	11,744.5	12,582.7
Operating expenses:
Depreciation and amortization	54.9	53.6	166.8	145.6
Equity in earnings (losses)	(15.0)	(17.1)	(1.4)	(32.3)
Cost of Reimbursable Expenses	1,886.7	1,949.8	5,591.6	5,727.1
Revenue	3,978.1	4,495.6	11,744.5	12,582.7
Operating Income (Loss)	154.9	171.6	230.3	347.1
Restructuring and acquisition charges	(33.5)	(70.0)	(75.8)	(114.3)
Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	2,380.8	2,687.6	7,132.9	7,401.3
Operating expenses:
Depreciation and amortization	36.4	35.3	112.9	88.9
Equity in earnings (losses)	(4.8)	(1.5)	(20.4)	(1.6)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	140.0	177.9	277.1	359.1
Revenue	2,380.8	2,687.6	7,132.9	7,401.3
Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	743.8	862.6	2,125.9	2,404.3
Operating expenses:
Depreciation and amortization	9.8	10.1	28.0	32.7
Equity in earnings (losses)	(0.8)	0.0	(0.8)	1.0
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	(1.9)	13.8	(55.8)	(17.9)
Revenue	743.8	862.6	2,125.9	2,404.3
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	743.2	833.8	2,170.6	2,437.7
Operating expenses:
Depreciation and amortization	6.9	6.5	20.5	19.3
Equity in earnings (losses)	(0.9)	(0.7)	(0.7)	(1.4)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	35.8	31.5	57.4	59.5
Revenue	743.2	833.8	2,170.6	2,437.7
Investment Management [Member]
Segment revenue:
Revenue	110.3	111.6	315.1	339.4
Operating expenses:
Depreciation and amortization	1.8	1.7	5.4	4.7
Equity in earnings (losses)	(8.5)	(14.9)	20.5	(30.3)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	29.5	35.5	28.8	93.0
Revenue	110.3	111.6	315.1	339.4
Leasing [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	325.2	472.7	1,022.2	1,354.3
Operating expenses:
Revenue	325.2	472.7	1,022.2	1,354.3
Leasing [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	58.5	72.2	153.3	190.3
Operating expenses:
Revenue	58.5	72.2	153.3	190.3
Leasing [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	46.6	59.4	105.8	161.5
Operating expenses:
Revenue	46.6	59.4	105.8	161.5
Capital Markets [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	190.8	323.2	579.0	553.1
Operating expenses:
Revenue	190.8	323.2	579.0	553.1
Capital Markets [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	73.3	106.2	196.5	248.7
Operating expenses:
Revenue	73.3	106.2	196.5	248.7
Capital Markets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	20.4	50.6	66.1	128.2
Operating expenses:
Revenue	20.4	50.6	66.1	128.2
Property & Facility Management [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	1,433.3	1,386.3	4,331.6	4,119.2
Operating expenses:
Revenue	1,433.3	1,386.3	4,331.6	4,119.2
Property & Facility Management [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	348.7	387.1	1,044.2	1,137.0
Operating expenses:
Revenue	348.7	387.1	1,044.2	1,137.0
Property & Facility Management [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	521.3	539.4	1,568.5	1,630.6
Operating expenses:
Revenue	521.3	539.4	1,568.5	1,630.6
Project & Development Services [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	336.2	406.0	917.9	1,091.5
Operating expenses:
Revenue	336.2	406.0	917.9	1,091.5
Project & Development Services [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	190.8	234.2	558.3	633.9
Operating expenses:
Revenue	190.8	234.2	558.3	633.9
Project & Development Services [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	104.5	145.7	296.5	393.9
Operating expenses:
Revenue	104.5	145.7	296.5	393.9
Advisory, Consulting and Other [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue	95.3	99.4	282.2	283.2
Operating expenses:
Revenue	95.3	99.4	282.2	283.2
Advisory, Consulting and Other [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue	72.5	62.9	173.6	194.4
Operating expenses:
Revenue	72.5	62.9	173.6	194.4
Advisory, Consulting and Other [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	50.4	38.7	133.7	123.5
Operating expenses:
Revenue	50.4	38.7	133.7	123.5
Advisory Fees [Member] | Investment Management [Member]
Segment revenue:
Revenue	84.6	79.9	251.1	237.0
Operating expenses:
Revenue	84.6	79.9	251.1	237.0
Transaction Fees & Other [Member] | Investment Management [Member]
Segment revenue:
Revenue	17.7	14.2	36.1	43.7
Operating expenses:
Revenue	17.7	14.2	36.1	43.7
Incentive Fees [Member] | Investment Management [Member]
Segment revenue:
Revenue	8.0	17.5	27.9	58.7
Operating expenses:
Revenue	$ 8.0	$ 17.5	$ 27.9	$ 58.7

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