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Investments in Real Estate Ventures (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
investment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of separate property or fund co-investments | investment 50    
Minimum ownership percentage in real estate ventures (in hundredths) 1.00%    
Maximum ownership percentage in real estate ventures (in hundredths) 10.00%    
Summary of equity method investments [Abstract]      
Variable Interest Entity, Nonconsolidated, Carrying Amount, Net Assets and Liabilities $ 95.2 $ 76.4  
Property and equipment, net 740.0 663.9  
Investments 745.7 430.8  
Total assets 15,505.0 14,316.5  
Other Liabilities, Current 218.1 299.6  
Mortgage indebtedness 577.7 597.5  
Total liabilities 9,083.8 8,698.7  
Total liabilities and equity 15,505.0 14,316.5  
Revenues 19,367.0 16,589.9 $ 17,983.2
Net income 959.3 422.7 537.9
Balance Sheet [Abstract]      
Equity Method Investment, Summarized Information, Noncurrent Assets 31,084.0 24,320.4  
Equity Method Investment, Summarized Information, Assets 34,816.3 28,129.3  
Mortgage indebtedness 9,708.5 7,980.2  
Other borrowings 1,864.1 1,332.9  
Equity Method Investment, Summarized Information, Liabilities 13,275.3 10,720.5  
Equity Method Investment Summarized Information, Equity 21,541.0 17,408.8  
Equity Method Investment, Summarized Information, Revenue 2,103.6 1,702.3 1,247.6
Equity Method Investment, Summarized Information, Net Income (Loss) 1,850.7 241.5 831.2
Fair Value [Abstract]      
Fair value investments at beginning of the period 340.3 328.6 247.3
Investments, at Fair Value, Additions 190.3 51.7 144.9
Investments, at Fair Value, Distributions 84.0 46.8 101.7
Net fair value gain 201.2 (1.0) 35.3
Investments, at Fair Value, Foreign Currency Translation (8.2) 7.8 2.8
Fair value investments at end of the period 639.6 340.3 328.6
Consolidated Variable Interest Entities [Member]      
Summary of equity method investments [Abstract]      
Property and equipment, net 184.7 117.4  
Investments 10.2 9.0  
Other Assets 17.7 21.0  
Total assets 212.6 147.4  
Other Liabilities, Current 2.1 1.9  
Loans Payable, Fair Value Disclosure 107.5 60.3  
Total liabilities 109.6 62.2  
Members' Equity 103.0 85.2  
Total liabilities and equity 212.6 147.4  
Revenues 11.0 13.9 7.6
Other Expenses (14.9) (15.6) (8.6)
Gains on Sales of Investments 0.0 22.1 0.0
Net income $ (3.9) 20.4 $ (1.0)
LaSalle Investment Company II [Member]      
Summary of equity method investments [Abstract]      
Our effective ownership interest in co-investment vehicle 48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 60.3    
Investments 354.6 300.3  
LaSalle Investment Management [Member]      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted 372.4    
JLL Technologies      
Summary of equity method investments [Abstract]      
Investments 353.6 94.0  
Other investments      
Summary of equity method investments [Abstract]      
Investments $ 37.5 $ 36.5