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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Restructuring and acquisition charges	$ (35.7)	$ (19.5)
Interest on employee loans, net	(0.2)	0.0
Net non-cash MSR and mortgage banking derivative activity	(1.8)	(3.6)
Interest Expense, Net of Interest Income	(26.3)	(10.2)
Provision for income taxes	2.3	(40.3)
Depreciation and amortization adjusted	(56.5)	(54.4)
Depreciation and amortization	(57.5)	(54.4)
Equity in earnings (losses)	(2.6)	18.5
Adjusted EBITDA	109.0	273.6
Segment revenue:
Revenue	4,715.5	4,801.4
Markets Advisory
Segment Reporting Information [Line Items]
Depreciation and amortization adjusted	(16.1)	(17.1)
Equity in earnings (losses)	0.3	0.5
Adjusted EBITDA	71.6	111.2
Segment revenue:
Revenue	906.4	999.5
Capital Markets
Segment Reporting Information [Line Items]
Depreciation and amortization	(15.9)	(15.6)
Equity in earnings (losses)	0.6	0.8
Adjusted EBITDA	10.7	118.2
Segment revenue:
Revenue	357.1	600.6
Work Dynamics
Segment Reporting Information [Line Items]
Depreciation and amortization	(19.3)	(16.5)
Equity in earnings (losses)	0.4	0.3
Adjusted EBITDA	25.7	35.2
Segment revenue:
Revenue	3,276.2	3,033.6
JLL Technologies
Segment Reporting Information [Line Items]
Depreciation and amortization	(3.9)	(3.8)
Equity in earnings (losses)	4.9	18.8
Adjusted EBITDA	(13.3)	(12.3)
Segment revenue:
Revenue	61.4	49.4
LaSalle Investment Management
Segment Reporting Information [Line Items]
Depreciation and amortization	(1.3)	(1.4)
Equity in earnings (losses)	(8.8)	(1.9)
Adjusted EBITDA	14.3	21.3
Segment revenue:
Revenue	114.4	118.3
Leasing | Markets Advisory
Segment revenue:
Revenue	487.0	600.9
Property Management | Markets Advisory
Segment revenue:
Revenue	400.2	370.5
Advisory and Consulting | Markets Advisory
Segment revenue:
Revenue	19.2	28.1
Investment Sales, Debt/Equity Advisory and Other | Capital Markets
Segment revenue:
Revenue	240.6	476.1
Valuation Advisory | Capital Markets
Segment revenue:
Revenue	79.1	84.6
Loan Servicing | Capital Markets
Segment revenue:
Revenue	37.4	39.9
Workplace Management | Work Dynamics
Segment revenue:
Revenue	2,497.2	2,320.4
Project Management | Work Dynamics
Segment revenue:
Revenue	676.3	612.3
Portfolio Services and Other | Work Dynamics
Segment revenue:
Revenue	102.7	100.9
Advisory Fees | LaSalle Investment Management
Segment revenue:
Revenue	100.5	97.0
Transaction Fees & Other | LaSalle Investment Management
Segment revenue:
Revenue	10.4	17.1
Incentive Fees | LaSalle Investment Management
Segment revenue:
Revenue	$ 3.5	$ 4.2

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