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Investments (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
investment
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of separate property or fund co-investments | investment 55    
Property, Plant and Equipment, Net, consolidated VIE $ 749.1   $ 740.0
Investments 785.3   745.7
Total assets 15,392.6   15,505.0
Other Liabilities, Current 274.4   218.1
Total liabilities 8,969.9   9,083.8
Total liabilities and equity 15,392.6   15,505.0
Revenue 4,801.4 $ 4,037.1  
Net income 143.9 102.4  
Fair Value [Abstract]      
Fair value investments at beginning of the period 639.6 340.3  
Investments in Real Estate Ventures, at Fair Value, Additions 34.2 55.8  
Investments in Real Estate Ventures, at Fair Value, Distributions (6.6) (3.3)  
Unrealized Gain (Loss) on Investments 15.2 45.7  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation (4.9) (3.1)  
Fair value investments at end of the period 677.5 435.4  
JLL Technologies      
Schedule of Equity Method Investments [Line Items]      
Investments $ 396.4   353.6
LaSalle Investment Company II [Member]      
Schedule of Equity Method Investments [Line Items]      
Partnership ownership interest (in hundredths) 48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 60.3    
Investments 351.3   354.6
LaSalle Investment Management      
Schedule of Equity Method Investments [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 360.8    
Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures      
Schedule of Equity Method Investments [Line Items]      
Investments 37.6   37.5
Consolidated Variable Interest Entities [Member]      
Schedule of Equity Method Investments [Line Items]      
Property, Plant and Equipment, Net, consolidated VIE 195.4   184.7
Investments 10.4   10.2
Other Assets, consolidated VIE 24.3   17.7
Total assets 230.1   212.6
Other Liabilities, Current 2.3   2.1
Loans Payable, Fair Value Disclosure, consolidated VIE 111.3   107.5
Total liabilities 113.6   109.6
Members' Equity, consolidated VIE 116.5   103.0
Total liabilities and equity 230.1   $ 212.6
Revenue 3.5 2.6  
Other Expenses, consolidated VIE (5.7) (3.2)  
Net income $ (2.2) $ (0.6)