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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Restructuring and acquisition charges	$ (25.9)	$ (18.1)	$ (45.4)	$ (35.3)
Gain (Loss) on Disposition of Business	(7.5)	0.0	(7.5)	12.0
Interest Expense, Net of Interest Income	(15.7)	(10.6)	(25.9)	(21.0)
Provision for income taxes	(72.8)	(54.9)	(113.1)	(83.1)
Depreciation and amortization adjusted	(54.4)	(54.5)	(108.8)	(107.5)
Depreciation and amortization	(55.4)	(54.5)	(109.8)	(107.5)
Equity in earnings (losses)	53.6	40.8	72.1	89.3
Net non-cash mortgage servicing rights and mortgage banking derivative activity	11.2	5.7	7.6	15.4
Adjusted EBITDA	359.0	332.4	632.6	522.5
Segment revenue:
Revenue	5,278.4	4,495.0	10,079.8	8,532.1
Markets Advisory
Segment Reporting Information [Line Items]
Depreciation and amortization adjusted	(16.3)	(16.7)	(33.4)	(32.6)
Equity in earnings (losses)	0.4	0.1	0.9	0.5
Adjusted EBITDA	134.0	113.9	245.2	179.9
Segment revenue:
Revenue	1,118.2	951.3	2,117.7	1,744.0
Capital Markets
Segment Reporting Information [Line Items]
Depreciation and amortization	(15.4)	(16.7)	(31.0)	(32.6)
Equity in earnings (losses)	0.6	1.4	1.4	1.8
Adjusted EBITDA	126.7	120.8	244.9	179.9
Segment revenue:
Revenue	684.5	552.1	1,285.1	963.8
Work Dynamics
Segment Reporting Information [Line Items]
Depreciation and amortization	(17.0)	(16.8)	(33.5)	(33.0)
Equity in earnings (losses)	0.9	(0.3)	1.2	(0.2)
Adjusted EBITDA	57.6	51.2	92.8	76.1
Segment revenue:
Revenue	3,310.5	2,836.2	6,344.1	5,534.3
JLL Technologies
Segment Reporting Information [Line Items]
Depreciation and amortization	(3.9)	(2.2)	(7.7)	(5.1)
Equity in earnings (losses)	44.7	16.2	63.5	50.8
Adjusted EBITDA	12.9	(1.5)	0.6	12.5
Segment revenue:
Revenue	50.7	39.6	100.1	83.0
LaSalle Investment Management
Segment Reporting Information [Line Items]
Depreciation and amortization	(1.8)	(2.1)	(3.2)	(4.2)
Equity in earnings (losses)	7.0	23.4	5.1	36.4
Adjusted EBITDA	27.8	48.0	49.1	74.1
Segment revenue:
Revenue	114.5	115.8	232.8	207.0
Leasing | Markets Advisory
Segment revenue:
Revenue	708.4	572.4	1,309.3	989.0
Property Management | Markets Advisory
Segment revenue:
Revenue	378.2	347.8	748.7	695.4
Advisory and Consulting | Markets Advisory
Segment revenue:
Revenue	31.6	31.1	59.7	59.6
Investment Sales, Debt/Equity Advisory and Other | Capital Markets
Segment revenue:
Revenue	549.7	430.1	1,025.8	732.1
Valuation Advisory | Capital Markets
Segment revenue:
Revenue	94.4	91.4	179.0	171.1
Loan Servicing | Capital Markets
Segment revenue:
Revenue	40.4	30.6	80.3	60.6
Workplace Management | Work Dynamics
Segment revenue:
Revenue	2,434.0	2,107.2	4,754.4	4,155.6
Project Management | Work Dynamics
Segment revenue:
Revenue	754.8	617.8	1,367.1	1,169.6
Portfolio Services and Other | Work Dynamics
Segment revenue:
Revenue	121.7	111.2	222.6	209.1
Advisory Fees | LaSalle Investment Management
Segment revenue:
Revenue	103.2	89.6	200.2	173.1
Transaction Fees & Other | LaSalle Investment Management
Segment revenue:
Revenue	10.3	11.0	27.4	18.7
Incentive Fees | LaSalle Investment Management
Segment revenue:
Revenue	$ 1.0	$ 15.2	$ 5.2	$ 15.2

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