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Investments (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
investment
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of separate property or fund co-investments | investment 47    
Investments $ 896.0   $ 873.8
Revenue 4,715.5 $ 4,801.4  
Net income (8.7) 143.9  
Fair Value [Abstract]      
Fair value investments at beginning of the period 794.9 639.6  
Investments in Real Estate Ventures, at Fair Value, Additions 32.8 34.2  
Investments in Real Estate Ventures, at Fair Value, Distributions (6.6) (6.6)  
Unrealized Gain (Loss) on Investments (3.3) 15.2  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation 7.7 (4.9)  
Fair value investments at end of the period 825.5 677.5  
JLL Technologies      
Schedule of Equity Method Investments [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 16.0    
Investments 496.3   483.4
LaSalle Investment Company II [Member]      
Schedule of Equity Method Investments [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 60.3    
LaSalle Investment Management      
Schedule of Equity Method Investments [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 326.9    
Investments 374.9   366.5
Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures      
Schedule of Equity Method Investments [Line Items]      
Investments 24.8   $ 23.9
Consolidated Variable Interest Entities [Member]      
Schedule of Equity Method Investments [Line Items]      
Revenue 0.0 3.5  
Other Expenses, consolidated VIE 0.0 (5.7)  
Net income $ 0.0 $ (2.2)