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Investments in Real Estate Ventures (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
investment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of separate property or fund co-investments | investment 50    
Minimum ownership percentage in real estate ventures (in hundredths) 1.00%    
Maximum ownership percentage in real estate ventures (in hundredths) 10.00%    
Summary of equity method investments [Abstract]      
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net $ 76.4 $ 65.5  
Property and equipment, net 663.9 701.9  
Investments In Real Estate Ventures 430.8 404.2  
Total assets 14,316.5 13,672.6  
Other Liabilities, Current 299.6 203.2  
Mortgage indebtedness 597.5 436.2  
Total liabilities 8,698.7 8,459.3  
Total liabilities and equity 14,316.5 13,672.6  
Revenues 16,589.9 17,983.2 $ 16,318.4
Net income 422.7 537.9 491.7
Balance Sheet [Abstract]      
Equity Method Investment, Summarized Financial Information,Noncurrent Assets 24,320.4 22,006.6  
Equity Method Investment, Summarized Financial Information,Assets 28,129.3 24,784.8  
Mortgage indebtedness 7,980.2 7,345.1  
Other borrowings 1,332.9 1,118.2  
Total Liabilities 10,720.5 9,853.9  
Total equity 17,408.8 14,930.9  
Statements of Operations [Abstract]      
Revenue 1,702.3 1,247.6 1,199.5
Net Income (Loss) 241.5 831.2 1,046.3
Fair Value [Abstract]      
Fair value investments at beginning of the period 328.6 247.3 242.3
Investments in Real Estate Ventures, at Fair Value, Additions 51.7 144.9 55.2
Investments in Real Estate Ventures, at Fair Value, Distributions (46.8) (101.7) (63.8)
Net fair value gain (1.0) 35.3 13.9
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation 7.8 2.8 (0.3)
Fair value investments at end of the period $ 340.3 328.6 247.3
LaSalle Investment Company II [Member]      
Summary of equity method investments [Abstract]      
Our effective ownership interest in co-investment vehicle 48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 60.4    
LaSalle Investment Management [Member]      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted 320.7    
Consolidated Variable Interest Entities [Member]      
Summary of equity method investments [Abstract]      
Property and equipment, net 117.4 126.3  
Investments In Real Estate Ventures 9.0 13.2  
Other Assets 21.0 14.3  
Total assets 147.4 153.8  
Other Liabilities, Current 1.9 3.2  
Loans Payable, Fair Value Disclosure 60.3 69.7  
Total liabilities 62.2 72.9  
Members' Equity 85.2 80.9  
Total liabilities and equity 147.4 153.8  
Revenues 13.9 7.6 5.8
Other Expenses (15.6) (8.6) (5.1)
Gains on Sales of Investments 22.1 0.0 2.0
Net income $ 20.4 $ (1.0) $ 2.7