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Investments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
investment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Summary of equity method investments [Abstract]      
Variable Interest Entity, Nonconsolidated, Carrying Amount, Net Assets and Liabilities $ 146.9 $ 116.0  
Property and equipment, net 613.9 582.9  
Investments 816.6 873.8  
Total assets 16,064.8 15,593.7  
Other Liabilities, Current 325.7 330.5  
Mortgage indebtedness 388.5 407.0  
Total liabilities 9,654.9 9,444.2  
Total liabilities and equity 16,064.8 15,593.7  
Revenues 20,760.8 20,862.1 $ 19,367.0
Net income 226.2 793.4 959.3
Balance Sheet [Abstract]      
Equity Method Investment, Summarized Information, Noncurrent Assets 37,233.7 36,855.2  
Equity Method Investment, Summarized Information, Assets 41,321.2 40,367.9  
Mortgage indebtedness 12,321.2 11,790.0  
Other borrowings 2,584.1 3,100.5  
Equity Method Investment, Summarized Information, Liabilities 17,513.9 16,986.9  
Equity Method Investment Summarized Information, Equity 23,807.3 23,381.0  
Equity Method Investment, Summarized Information, Revenue 2,403.5 2,193.4 2,103.6
Equity Method Investment, Summarized Information, Net Income (Loss) (1,085.8) 576.6 1,850.7
Fair Value [Abstract]      
Fair value investments at beginning of the period 794.9 639.6 340.3
Investments, at Fair Value, Additions 160.4 156.1 190.3
Investments, at Fair Value, Distributions (25.2) (38.5) (84.0)
Net fair value gain (197.8) 61.3 201.2
Investments, at Fair Value, Foreign Currency Translation 8.5 (23.6) (8.2)
Fair value investments at end of the period 740.8 794.9 639.6
Consolidated Variable Interest Entities [Member]      
Summary of equity method investments [Abstract]      
Revenues 0.0 17.6 11.0
Other Expenses 0.0 (23.8) (14.9)
Gains on Sales of Investments 0.0 142.3 0.0
Net income 0.0 136.1 $ (3.9)
LaSalle Investment Company II [Member]      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 60.3    
LaSalle Investment Management [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of separate property or fund co-investments | investment 48    
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 341.0    
Investments 388.3 366.5  
JLL Technologies      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted 13.6    
Investments 397.6 483.4  
Fair Value [Abstract]      
Other than Temporary Impairment Losses, Investments   19.6  
Other investments      
Summary of equity method investments [Abstract]      
Investments $ 30.7 $ 23.9