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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Restructuring and acquisition charges	$ (19.5)	$ (17.2)
Gain (Loss) on Disposition of Business	0.0	12.0
Interest Expense, Net of Interest Income	(10.2)	(10.4)
Provision for income taxes	(40.3)	(28.2)
Depreciation and amortization	(54.4)	(53.0)
Equity in earnings (losses)	18.5	48.5
Adjusted EBITDA	273.6	190.1
Segment revenue:
Revenue	4,801.4	4,037.1
Operating expenses:
Net non-cash mortgage servicing rights and mortgage banking derivative activity	(3.6)	9.7
Markets Advisory
Segment Reporting Information [Line Items]
Depreciation and amortization	(17.1)	(15.9)
Equity in earnings (losses)	0.5	0.4
Adjusted EBITDA	111.2	66.0
Segment revenue:
Revenue	999.5	792.7
Capital Markets
Segment Reporting Information [Line Items]
Depreciation and amortization	(15.6)	(15.9)
Equity in earnings (losses)	0.8	0.4
Adjusted EBITDA	118.2	59.1
Segment revenue:
Revenue	600.6	411.7
Work Dynamics
Segment Reporting Information [Line Items]
Depreciation and amortization	(16.5)	(16.2)
Equity in earnings (losses)	0.3	0.1
Adjusted EBITDA	35.2	24.9
Segment revenue:
Revenue	3,033.6	2,698.1
JLL Technologies
Segment Reporting Information [Line Items]
Depreciation and amortization	(3.8)	(2.9)
Equity in earnings (losses)	18.8	34.6
Adjusted EBITDA	(12.3)	14.0
Segment revenue:
Revenue	49.4	43.4
LaSalle Investment Management
Segment Reporting Information [Line Items]
Depreciation and amortization	(1.4)	(2.1)
Equity in earnings (losses)	(1.9)	13.0
Adjusted EBITDA	21.3	26.1
Segment revenue:
Revenue	118.3	91.2
Leasing | Markets Advisory
Segment revenue:
Revenue	600.9	416.6
Property Management | Markets Advisory
Segment revenue:
Revenue	370.5	347.6
Advisory and Consulting | Markets Advisory
Segment revenue:
Revenue	28.1	28.5
Investment Sales, Debt/Equity Advisory and Other | Capital Markets
Segment revenue:
Revenue	476.1	302.0
Valuation Advisory | Capital Markets
Segment revenue:
Revenue	84.6	79.7
Loan Servicing | Capital Markets
Segment revenue:
Revenue	39.9	30.0
Workplace Management | Work Dynamics
Segment revenue:
Revenue	2,320.4	2,048.4
Project Management | Work Dynamics
Segment revenue:
Revenue	612.3	551.8
Portfolio Services and Other | Work Dynamics
Segment revenue:
Revenue	100.9	97.9
Advisory Fees | LaSalle Investment Management
Segment revenue:
Revenue	97.0	83.5
Transaction Fees & Other | LaSalle Investment Management
Segment revenue:
Revenue	17.1	7.7
Incentive Fees | LaSalle Investment Management
Segment revenue:
Revenue	$ 4.2	$ 0.0

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