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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Net income attributable to common shareholders $ 66.1 $ (9.2)
Restructuring and acquisition charges (1.7) (35.7)
Interest on employee loans, net 1.0 (0.2)
Equity losses - JLL Technologies and LaSalle (4.9) (3.9)
Net non-cash MSR and mortgage banking derivative activity (9.0) (1.8)
Interest Expense, Net of Interest Income (30.5) (26.3)
Provision for income taxes (15.9) 2.3
Depreciation and amortization adjusted (60.0) (56.5)
Depreciation and amortization (61.0) (57.5)
Equity in earnings (losses) (3.7) (2.6)
Adjusted EBITDA 187.1 112.9
Segment revenue:    
Revenue 5,124.5 4,715.5
Markets Advisory    
Segment Reporting Information [Line Items]    
Depreciation and amortization adjusted (16.4) (16.1)
Equity in earnings (losses) 0.4 0.3
Adjusted EBITDA 95.3 71.6
Segment revenue:    
Revenue 950.1 906.4
Capital Markets    
Segment Reporting Information [Line Items]    
Depreciation and amortization (16.4) (15.9)
Equity in earnings (losses) 0.1 0.6
Adjusted EBITDA 25.0 10.7
Segment revenue:    
Revenue 377.6 357.1
Work Dynamics    
Segment Reporting Information [Line Items]    
Depreciation and amortization (20.7) (19.3)
Equity in earnings (losses) 0.7 0.4
Adjusted EBITDA 50.9 25.7
Segment revenue:    
Revenue 3,639.5 3,276.2
JLL Technologies    
Segment Reporting Information [Line Items]    
Depreciation and amortization (4.5) (3.9)
Equity in earnings (losses) (1.0) 4.9
Adjusted EBITDA (5.1) (18.2)
Segment revenue:    
Revenue 53.9 61.4
LaSalle Investment Management    
Segment Reporting Information [Line Items]    
Depreciation and amortization (2.0) (1.3)
Equity in earnings (losses) (3.9) (8.8)
Adjusted EBITDA 21.0 23.1
Segment revenue:    
Revenue 103.4 114.4
Leasing | Markets Advisory    
Segment revenue:    
Revenue 497.3 487.0
Property Management | Markets Advisory    
Segment revenue:    
Revenue 429.7 400.2
Advisory and Consulting | Markets Advisory    
Segment revenue:    
Revenue 23.1 19.2
Investment Sales, Debt/Equity Advisory and Other | Capital Markets    
Segment revenue:    
Revenue 258.7 240.6
Value and Risk Advisory | Capital Markets    
Segment revenue:    
Revenue 80.2 79.1
Loan Servicing | Capital Markets    
Segment revenue:    
Revenue 38.7 37.4
Workplace Management | Work Dynamics    
Segment revenue:    
Revenue 2,871.7 2,497.2
Project Management | Work Dynamics    
Segment revenue:    
Revenue 656.4 676.3
Portfolio Services and Other | Work Dynamics    
Segment revenue:    
Revenue 111.4 102.7
Advisory Fees | LaSalle Investment Management    
Segment revenue:    
Revenue 92.3 100.5
Transaction Fees & Other | LaSalle Investment Management    
Segment revenue:    
Revenue 8.9 10.4
Incentive Fees | LaSalle Investment Management    
Segment revenue:    
Revenue $ 2.2 $ 3.5