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Investments (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
investment
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
investment
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Equity Method Investments [Line Items]          
Number of separate property or fund co-investments | investment 49   49    
Investments $ 872.7   $ 872.7   $ 873.8
Revenue 5,052.5 $ 5,278.4 9,768.0 $ 10,079.8  
Net income 3.2 335.5 (5.5) 479.4  
Fair Value [Abstract]          
Fair value investments at beginning of the period     794.9 639.6  
Investments in Real Estate Ventures, at Fair Value, Additions     123.8 121.8  
Investments in Real Estate Ventures, at Fair Value, Distributions     (11.1) (21.4)  
Unrealized Gain (Loss) on Investments     (110.5) 65.3  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation     5.4 (19.2)  
Fair value investments at end of the period 802.5 786.1 802.5 786.1  
JLL Technologies          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 14.9   14.9    
Investments 469.1   469.1   483.4
LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 60.3   60.3    
LaSalle Investment Management          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 324.1   324.1    
Investments 376.1   376.1   366.5
Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures          
Schedule of Equity Method Investments [Line Items]          
Investments 27.5   27.5   $ 23.9
Consolidated Variable Interest Entities [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenue 0.0 5.1 0.0 8.6  
Other Expenses, consolidated VIE 0.0 (6.0) 0.0 (11.7)  
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE 0.0 142.3 0.0 142.3  
Net income $ 0.0 $ 141.4 $ 0.0 $ 139.2