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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 80.7	$ 64.6
Restructuring and acquisition charges	(17.2)	(14.1)
Depreciation and amortization	53.0	55.0
Equity in earnings (losses)	(48.5)	28.3
Segment revenue:
Revenue Before Reimbursements	2,129.6	2,233.0
Revenue	4,037.1	4,096.0
Exclusive of LaSalle Investment Company II [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	1.7	1.8
Equity in earnings (losses)	(13.0)	40.3
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	19.4	(26.1)
Segment revenue:
Revenue	91.2	104.9
Americas [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	33.1	37.4
Equity in earnings (losses)	(34.5)	(12.7)
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	145.0	94.6
Segment revenue:
Revenue	2,443.9	2,523.1
EMEA [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	10.9	9.2
Equity in earnings (losses)	0.0	0.0
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	(35.8)	(20.5)
Segment revenue:
Revenue	716.2	755.9
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	7.3	6.6
Equity in earnings (losses)	(1.0)	0.7
Operating Income (Loss), Including Income (Loss) from Equity Method Investments	17.8	2.4
Segment revenue:
Revenue	785.8	712.1
Leasing [Member] | Americas [Member]
Segment revenue:
Revenue	363.7	418.9
Leasing [Member] | EMEA [Member]
Segment revenue:
Revenue	54.4	48.1
Leasing [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	31.4	25.4
Capital Markets [Member] | Americas [Member]
Segment revenue:
Revenue	216.9	247.4
Capital Markets [Member] | EMEA [Member]
Segment revenue:
Revenue	74.2	73.2
Capital Markets [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	29.3	21.7
Property & Facility Management [Member] | Americas [Member]
Segment revenue:
Revenue	1,494.8	1,458.8
Property & Facility Management [Member] | EMEA [Member]
Segment revenue:
Revenue	344.1	375.0
Property & Facility Management [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	575.1	532.0
Project & Development Services [Member] | Americas [Member]
Segment revenue:
Revenue	269.8	306.4
Project & Development Services [Member] | EMEA [Member]
Segment revenue:
Revenue	183.7	203.2
Project & Development Services [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	98.3	94.8
Advisory, Consulting and Other [Member] | Americas [Member]
Segment revenue:
Revenue	98.7	91.6
Advisory, Consulting and Other [Member] | EMEA [Member]
Segment revenue:
Revenue	59.8	56.4
Advisory, Consulting and Other [Member] | Asia Pacific [Member]
Segment revenue:
Revenue	51.7	38.2
Advisory Fees [Member] | Exclusive of LaSalle Investment Company II [Member]
Segment revenue:
Revenue	83.5	85.6
Transaction Fees & Other [Member] | Exclusive of LaSalle Investment Company II [Member]
Segment revenue:
Revenue	7.7	13.6
Incentive Fees [Member] | Exclusive of LaSalle Investment Company II [Member]
Segment revenue:
Revenue	$ 0.0	$ 5.7

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