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Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 559.1	$ 715.4	$ 706.9
Restructuring and acquisition charges	(142.4)	(184.4)	(38.8)
Depreciation and amortization	226.4	202.4	186.1
Equity in earnings (losses)	(8.0)	(36.3)	(32.8)
Segment revenue:
Revenues	16,589.9	17,983.2	16,318.4
Revenue Before Reimbursements	8,900.1	10,030.6	9,089.5
LaSalle Investment Management [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	7.2	6.4	3.0
Equity in earnings (losses)	12.4	(33.3)	(30.0)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	54.2	147.4	163.7
Segment revenue:
Revenues	421.8	526.1	533.9
Americas [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	151.4	126.5	109.1
Equity in earnings (losses)	(19.0)	(1.7)	(0.8)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	554.9	613.1	422.7
Segment revenue:
Revenues	10,005.2	10,578.9	9,041.0
EMEA [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	40.0	43.1	50.8
Equity in earnings (losses)	0.0	1.0	0.0
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	(16.0)	46.0	77.0
Segment revenue:
Revenues	3,092.8	3,470.7	3,495.0
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	27.8	26.4	23.2
Equity in earnings (losses)	(1.4)	(2.3)	(2.0)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	116.4	129.6	115.1
Segment revenue:
Revenues	3,070.1	3,407.5	3,248.5
Leasing [Member] | Americas [Member]
Segment revenue:
Revenues	1,451.2	1,960.5	1,754.1
Leasing [Member] | EMEA [Member]
Segment revenue:
Revenues	245.6	302.7	333.0
Leasing [Member] | Asia Pacific [Member]
Segment revenue:
Revenues	187.4	260.8	285.0
Capital Markets [Member] | Americas [Member]
Segment revenue:
Revenues	952.0	914.2	500.3
Capital Markets [Member] | EMEA [Member]
Segment revenue:
Revenues	330.7	411.9	464.1
Capital Markets [Member] | Asia Pacific [Member]
Segment revenue:
Revenues	124.7	216.1	181.0
Property & Facility Management [Member] | Americas [Member]
Segment revenue:
Revenues	5,878.2	5,607.9	5,142.2
Property & Facility Management [Member] | EMEA [Member]
Segment revenue:
Revenues	1,456.6	1,551.6	1,482.2
Property & Facility Management [Member] | Asia Pacific [Member]
Segment revenue:
Revenues	2,150.6	2,205.2	2,158.4
Project & Development Services [Member] | Americas [Member]
Segment revenue:
Revenues	1,333.5	1,689.6	1,301.7
Project & Development Services [Member] | EMEA [Member]
Segment revenue:
Revenues	785.6	904.3	920.3
Project & Development Services [Member] | Asia Pacific [Member]
Segment revenue:
Revenues	411.0	527.6	447.0
Advisory, Consulting and Other [Member] | Americas [Member]
Segment revenue:
Revenues	390.3	406.7	342.7
Advisory, Consulting and Other [Member] | EMEA [Member]
Segment revenue:
Revenues	274.3	300.2	295.4
Advisory, Consulting and Other [Member] | Asia Pacific [Member]
Segment revenue:
Revenues	196.4	197.8	177.1
Advisory Fees [Member] | LaSalle Investment Management [Member]
Segment revenue:
Revenues	336.4	326.4	276.7
Transaction Fees & Other [Member] | LaSalle Investment Management [Member]
Segment revenue:
Revenues	43.9	61.3	41.4
Incentive Fees [Member] | LaSalle Investment Management [Member]
Segment revenue:
Revenues	$ 41.5	$ 138.4	$ 215.8

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