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Business Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 23,432.9 $ 20,760.8 $ 20,862.1
Equity in earnings (losses) (70.8) (194.1) 51.0
Adjusted EBITDA 1,186.3 938.4 1,200.3
Restructuring and acquisition charges (23.1) (100.7) (104.8)
Gain (Loss) on Disposition of Business 0.0 (0.5) (7.5)
Interest on employee loans, net [Abstract] 5.9 3.6 9.7
Equity earnings (losses) - JLL Technologies and LaSalle (76.4) (201.7) 47.0
Credit losses on convertible note investments (6.3) 0.0 0.0
Net non-cash mortgage servicing rights and mortgage banking derivative activity (18.2) (18.2) 11.0
Interest Income (Expense), Operating (136.9) (135.4) (75.2)
Income Tax Expense (Benefit) (132.5) (25.7) (200.8)
Depreciation and amortization adjusted 252.0 234.4 225.2
Depreciation and amortization 255.8 238.4 228.1
Net Income available to common stockholders 546.8 225.4 654.5
Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 4,500.7 4,121.6 4,415.5
Platform compensation and benefits 2,309.2 2,178.2 2,433.7
Platform operating, admin and other 371.9 368.3 405.0
Gross contract costs 1,269.6 1,153.6 1,055.3
Equity in earnings (losses) 0.7 (0.5) (0.3)
Segment Reporting, Other Segment Item, Amount (3.1) (4.4) 6.3
Adjusted EBITDA 547.6 416.6 527.5
Depreciation and amortization adjusted 66.2 65.6 70.6
Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 2,040.4 1,778.0 2,488.2
Platform compensation and benefits 1,491.9 1,337.7 1,727.1
Platform operating, admin and other 278.4 246.1 263.2
Gross contract costs 48.6 47.5 47.0
Equity in earnings (losses) 2.7 6.7 3.1
Segment Reporting, Other Segment Item, Amount 20.2 19.7 (10.0)
Adjusted EBITDA 244.4 173.1 444.0
Depreciation and amortization 66.8 65.6 61.6
Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 16,197.6 14,131.1 13,268.5
Platform compensation and benefits 1,385.8 1,305.1 1,202.3
Platform operating, admin and other 467.8 431.6 432.9
Gross contract costs 14,029.9 12,131.4 11,403.8
Equity in earnings (losses) 2.2 1.4 1.2
Segment Reporting, Other Segment Item, Amount 0.0 (0.4) (0.6)
Adjusted EBITDA 316.3 264.0 230.1
Depreciation and amortization 91.1 79.2 71.1
JLL Technologies      
Segment Reporting Information [Line Items]      
Revenues 226.3 246.4 213.9
Platform compensation and benefits 197.0 200.7 240.3
Platform operating, admin and other 54.2 50.3 57.4
Gross contract costs 5.5 14.5 13.7
Equity in earnings (losses) (53.8) (177.0) 46.6
Segment Reporting, Other Segment Item, Amount 8.1 0.0 0.0
Adjusted EBITDA (22.3) (19.1) (97.5)
Depreciation and amortization 19.4 15.9 15.4
LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues 467.9 483.7 476.0
Platform compensation and benefits 268.9 288.7 290.4
Platform operating, admin and other 69.8 62.6 59.7
Gross contract costs 37.4 28.9 29.3
Equity in earnings (losses) (22.6) (24.7) 0.4
Segment Reporting, Other Segment Item, Amount 8.5 0.3 (0.4)
Adjusted EBITDA 100.3 103.8 96.2
Depreciation and amortization 8.5 8.1 6.5
Leasing [Member] | Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 2,596.2 2,343.6 2,759.2
Property Management | Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 1,795.1 1,675.1 1,525.3
Advisory, Consulting and Other | Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 109.4 102.9 131.0
Investment Sales, Debt/Equity Advisory and Other | Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,506.2 1,261.6 1,955.4
Value and Risk Advisory | Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 373.0 363.8 374.9
Loan Servicing | Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 161.2 152.6 157.9
Workplace Management | Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 12,529.7 10,706.2 9,819.2
Project Management | Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 3,151.9 2,924.8 2,972.3
Portfolio Services and Other | Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 516.0 500.1 477.0
Advisory Fees [Member] | LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues 373.8 406.2 404.6
Transaction Fees & Other [Member] | LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues 33.5 30.0 44.8
Incentive Fees [Member] | LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues $ 60.6 $ 47.5 $ 26.6