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Investments (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
investment
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
investment
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]          
Number of separate property or fund co-investments | investment 55   55    
Property, Plant and Equipment, Net, consolidated VIE $ 731.5   $ 731.5   $ 740.0
Investments 890.9   890.9   745.7
Total assets 15,378.6   15,378.6   15,505.0
Other Liabilities, Current 380.7   380.7   218.1
Total liabilities 9,369.2   9,369.2   9,083.8
Total liabilities and equity 15,378.6   15,378.6   15,505.0
Revenue 5,177.5 $ 4,889.2 15,257.3 $ 13,421.3  
Net income 138.1 236.7 617.5 538.5  
Fair Value [Abstract]          
Fair value investments at beginning of the period     639.6 340.3  
Investments in Real Estate Ventures, at Fair Value, Additions     140.3 148.9  
Investments in Real Estate Ventures, at Fair Value, Distributions     (29.9) (46.6)  
Unrealized Gain (Loss) on Investments     65.2 100.8  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation     (28.5) (5.7)  
Fair value investments at end of the period 786.7 537.7 786.7 537.7  
JLL Technologies          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 352.5   352.5    
Investments $ 503.9   $ 503.9   353.6
LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Partnership ownership interest (in hundredths) 48.78%   48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 60.3   $ 60.3    
LaSalle Investment Management          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 352.5   352.5    
Investments 353.6   353.6   354.6
Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures          
Schedule of Equity Method Investments [Line Items]          
Investments 33.4   33.4   37.5
Consolidated Variable Interest Entities [Member]          
Schedule of Equity Method Investments [Line Items]          
Property, Plant and Equipment, Net, consolidated VIE 190.7   190.7   184.7
Investments 10.7   10.7   10.2
Other Assets, consolidated VIE 22.0   22.0   17.7
Total assets 223.4   223.4   212.6
Other Liabilities, Current 2.7   2.7   2.1
Loans Payable, Fair Value Disclosure, consolidated VIE 113.6   113.6   107.5
Total liabilities 116.3   116.3   109.6
Members' Equity, consolidated VIE 107.1   107.1   103.0
Total liabilities and equity 223.4   223.4   $ 212.6
Revenue 4.6 3.4 13.2 8.9  
Other Expenses, consolidated VIE (6.2) (4.3) (17.9) (11.0)  
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE 0.0 0.0 142.3 0.0  
Net income $ (1.6) $ (0.9) $ 137.6 $ (2.1)