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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Restructuring and acquisition charges	$ (21.0)	$ (15.6)	$ (66.4)	$ (50.9)
Gain (Loss) on Disposition of Business	0.0	0.4	(7.5)	12.4
Net non-cash MSR and mortgage banking derivative activity	5.2	28.1	12.8	43.5
Interest Expense, Net of Interest Income	(23.2)	(9.6)	(49.1)	(30.6)
Provision for income taxes	(42.3)	(65.3)	(155.4)	(148.4)
Depreciation and amortization adjusted	(54.7)	(52.8)	(163.5)	(160.3)
Depreciation and amortization	(55.7)	(52.8)	(165.5)	(160.3)
Equity in earnings (losses)	0.5	17.4	72.6	106.7
Adjusted EBITDA	276.2	352.0	908.8	874.5
Segment revenue:
Revenue	5,177.5	4,889.2	15,257.3	13,421.3
Markets Advisory
Segment Reporting Information [Line Items]
Depreciation and amortization adjusted	(16.6)	(16.4)	(50.0)	(49.0)
Equity in earnings (losses)	(0.2)	0.1	0.7	0.6
Adjusted EBITDA	132.1	149.2	377.3	329.1
Segment revenue:
Revenue	1,111.5	1,079.9	3,229.2	2,823.9
Capital Markets
Segment Reporting Information [Line Items]
Depreciation and amortization	(15.2)	(15.1)	(46.2)	(47.7)
Equity in earnings (losses)	0.7	1.3	2.1	3.1
Adjusted EBITDA	83.2	138.4	328.1	318.3
Segment revenue:
Revenue	595.2	680.3	1,880.3	1,644.1
Work Dynamics
Segment Reporting Information [Line Items]
Depreciation and amortization	(17.6)	(16.9)	(51.1)	(49.9)
Equity in earnings (losses)	0.1	0.3	1.3	0.1
Adjusted EBITDA	53.4	37.7	146.2	113.8
Segment revenue:
Revenue	3,289.8	2,960.4	9,633.9	8,494.7
JLL Technologies
Segment Reporting Information [Line Items]
Depreciation and amortization	(3.7)	(2.2)	(11.4)	(7.3)
Equity in earnings (losses)	1.0	7.3	64.5	58.1
Adjusted EBITDA	(15.3)	(10.7)	(14.7)	1.8
Segment revenue:
Revenue	56.5	38.8	156.6	121.8
LaSalle Investment Management
Segment Reporting Information [Line Items]
Depreciation and amortization	(1.6)	(2.2)	(4.8)	(6.4)
Equity in earnings (losses)	(1.1)	8.4	4.0	44.8
Adjusted EBITDA	22.8	37.4	71.9	111.5
Segment revenue:
Revenue	124.5	129.8	357.3	336.8
Leasing | Markets Advisory
Segment revenue:
Revenue	703.3	694.9	2,012.6	1,683.9
Property Management | Markets Advisory
Segment revenue:
Revenue	377.8	351.3	1,126.5	1,046.7
Advisory and Consulting | Markets Advisory
Segment revenue:
Revenue	30.4	33.7	90.1	93.3
Investment Sales, Debt/Equity Advisory and Other | Capital Markets
Segment revenue:
Revenue	465.0	554.7	1,490.8	1,286.8
Valuation Advisory | Capital Markets
Segment revenue:
Revenue	89.7	87.1	268.7	258.2
Loan Servicing | Capital Markets
Segment revenue:
Revenue	40.5	38.5	120.8	99.1
Workplace Management | Work Dynamics
Segment revenue:
Revenue	2,429.1	2,138.4	7,183.5	6,294.0
Project Management | Work Dynamics
Segment revenue:
Revenue	748.3	707.8	2,115.4	1,877.4
Portfolio Services and Other | Work Dynamics
Segment revenue:
Revenue	112.4	114.2	335.0	323.3
Advisory Fees | LaSalle Investment Management
Segment revenue:
Revenue	102.6	97.3	302.8	270.4
Transaction Fees & Other | LaSalle Investment Management
Segment revenue:
Revenue	10.0	10.2	37.4	28.9
Incentive Fees | LaSalle Investment Management
Segment revenue:
Revenue	$ 11.9	$ 22.3	$ 17.1	$ 37.5

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