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Investments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
investment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary of equity method investments [Abstract]      
Variable Interest Entity, Nonconsolidated, Carrying Amount, Net Assets and Liabilities $ 190.7 $ 146.9  
Property and equipment, net 598.1 613.9  
Investments 812.7 816.6  
Total assets 16,763.8 16,064.8  
Other Liabilities, Current 321.9 345.3  
Mortgage indebtedness 419.1 439.6  
Total liabilities 9,868.7 9,654.9  
Total liabilities and equity 16,763.8 16,064.8  
Revenues 23,432.9 20,760.8 $ 20,862.1
Net income 546.8 226.2 793.4
Balance Sheet [Abstract]      
Equity Method Investment, Summarized Information, Noncurrent Assets 36,058.9 37,233.7  
Equity Method Investment, Summarized Information, Assets 40,774.4 41,321.2  
Mortgage indebtedness 11,803.7 12,321.2  
Other borrowings 2,495.6 2,584.1  
Equity Method Investment, Summarized Information, Liabilities 17,525.1 17,513.9  
Equity Method Investment Summarized Information, Equity 23,249.3 23,807.3  
Equity Method Investment, Summarized Information, Revenue 2,586.2 2,403.5 2,193.4
Equity Method Investment, Summarized Information, Net Income (Loss) 253.5 (1,085.8) 576.6
Fair Value [Abstract]      
Fair value investments at beginning of the period 740.8 794.9 639.6
Investments, at Fair Value, Additions 104.3 160.4 156.1
Investments, at Fair Value, Distributions (27.8) (25.2) (38.5)
Net fair value gain (62.4) (197.8) 61.3
Investments, at Fair Value, Foreign Currency Translation (12.9) 8.5 (23.6)
Fair value investments at end of the period 742.0 740.8 794.9
Equity Investments accounted for under the measurement alternative 9.7    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]      
Fair Value [Abstract]      
Fair value investments at beginning of the period 367.3 452.0  
Fair value investments at end of the period 330.3 367.3 452.0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Investments [Member]      
Fair Value [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 12.3 66.9  
Consolidated Variable Interest Entities [Member]      
Summary of equity method investments [Abstract]      
Revenues 0.0 0.0 17.6
Other Expenses 0.0 0.0 (23.8)
Gains on Sales of Investments 0.0 0.0 142.3
Net income $ 0.0 0.0 136.1
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 $ 290.2    
Investments 406.1 388.3  
JLL Technologies      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted 9.4    
Investments 372.8 397.6  
Fair Value [Abstract]      
Other than Temporary Impairment Losses, Investments     $ 19.6
Other investments      
Summary of equity method investments [Abstract]      
Investments 33.8 $ 30.7  
Income Property Trust Fund [Domain]      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 100.0