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Business Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenues $ 20,760.8 $ 20,862.1 $ 19,367.0
Depreciation and amortization 238.4 228.1 217.5
Depreciation and amortization adjusted 234.4 225.2 217.5
Equity in earnings (losses) (194.1) 51.0 209.4
Adjusted EBITDA 736.7 1,247.3 1,496.5
Restructuring and acquisition charges (100.7) (104.8) (84.7)
Gain (Loss) on Disposition of Business (0.5) (7.5) 12.4
Interest on employee loans, net [Abstract] 3.6 9.7 0.0
Net non-cash mortgage servicing rights and mortgage banking derivative activity (18.2) 11.0 59.3
Interest Income (Expense), Net (135.4) (75.2) (40.1)
Income Tax Expense (Benefit) (25.7) (200.8) (264.3)
Net Income available to common stockholders 225.4 654.5 961.6
Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 4,121.6 4,415.5 4,188.7
Depreciation and amortization adjusted 65.6 70.6 69.4
Equity in earnings (losses) (0.5) (0.3) 0.7
Adjusted EBITDA 416.6 527.5 546.5
Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,778.0 2,488.2 2,620.5
Depreciation and amortization 65.6 61.6 63.1
Equity in earnings (losses) 6.7 3.1 4.9
Adjusted EBITDA 173.1 444.0 543.2
Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 14,131.1 13,268.5 11,891.5
Depreciation and amortization 79.2 71.1 66.2
Equity in earnings (losses) 1.4 1.2 0.4
Adjusted EBITDA 264.0 230.1 182.4
JLL Technologies      
Segment Reporting Information [Line Items]      
Revenues 246.4 213.9 166.2
Depreciation and amortization 15.9 15.4 10.5
Equity in earnings (losses) (177.0) 46.6 140.7
Adjusted EBITDA (196.1) (50.9) 53.4
LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues 483.7 476.0 500.1
Depreciation and amortization 8.1 6.5 8.3
Equity in earnings (losses) (24.7) 0.4 62.7
Adjusted EBITDA 79.1 96.6 171.0
Leasing [Member] | Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 2,343.6 2,759.2 2,618.1
Property Management | Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 1,675.1 1,525.3 1,437.9
Advisory, Consulting and Other | Markets Advisory      
Segment Reporting Information [Line Items]      
Revenues 102.9 131.0 132.7
Investment Sales, Debt/Equity Advisory and Other | Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,261.6 1,955.4 2,111.0
Value and Risk Advisory | Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 363.8 374.9 369.3
Loan Servicing | Capital Markets [Member]      
Segment Reporting Information [Line Items]      
Revenues 152.6 157.9 140.2
Workplace Management | Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 10,706.2 9,819.2 8,731.5
Project Management | Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 2,924.8 2,972.3 2,684.9
Portfolio Services and Other | Work Dynamics      
Segment Reporting Information [Line Items]      
Revenues 500.1 477.0 475.1
Advisory Fees [Member] | LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues 406.2 404.6 364.7
Transaction Fees & Other [Member] | LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues 30.0 44.8 41.5
Incentive Fees [Member] | LaSalle Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenues $ 47.5 $ 26.6 $ 93.9