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Investments in Real Estate Ventures (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
investment
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
investment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Number of separate property or fund co-investments | investment 46               46    
Minimum ownership percentage in real estate ventures (in hundredths) 1.00%               1.00%    
Maximum ownership percentage in real estate ventures (in hundredths) 10.00%               10.00%    
Summary of equity method investments [Abstract]                      
Property and equipment, net $ 701.9       $ 567.9       $ 701.9 $ 567.9  
Investments In Real Estate Ventures 404.2       356.9       404.2 356.9  
Total assets 13,672.6       10,025.5       13,672.6 10,025.5  
Other Liabilities, Current 203.2       185.7       203.2 185.7  
Mortgage indebtedness 436.2       387.3       436.2 387.3  
Total liabilities 8,459.3       6,291.0       8,459.3 6,291.0  
Total liabilities and equity 13,672.6       10,025.5       13,672.6 10,025.5  
Revenues 5,400.5 $ 4,495.6 $ 4,266.5 $ 3,820.6 4,889.7 $ 3,969.8 $ 3,903.7 $ 3,555.2 17,983.2 16,318.4 $ 14,453.2
Net income                 537.9 491.7 279.5
Balance Sheet [Abstract]                      
Investments in real estate, net of depreciation 22,006.6       13,217.7       22,006.6 13,217.7  
Total assets 24,784.8       15,561.2       24,784.8 15,561.2  
Mortgage indebtedness 7,345.1       4,968.0       7,345.1 4,968.0  
Other borrowings 1,118.2       561.7       1,118.2 561.7  
Total liabilities 9,853.9       6,155.8       9,853.9 6,155.8  
Total equity 14,930.9       9,405.4       14,930.9 9,405.4  
Statements of Operations [Abstract]                      
Revenue                 1,247.6 1,199.5 1,319.0
Net income (loss)                 831.2 1,046.3 895.7
Fair Value [Abstract]                      
Fair value investments at beginning of the period       $ 247.3       $ 242.3 247.3 242.3 212.7
Investments in Real Estate Ventures, at Fair Value, Additions                 144.9 55.2 33.5
Investments in Real Estate Ventures, at Fair Value, Distributions                 101.7 63.8 37.1
Net fair value gain                 35.3 13.9 28.1
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation                 2.8 (0.3) 5.1
Fair value investments at end of the period $ 328.6       247.3       $ 328.6 247.3 242.3
LaSalle Investment Company II [Member]                      
Summary of equity method investments [Abstract]                      
Our effective ownership interest in co-investment vehicle 48.78%               48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 60.4               $ 60.4    
LaSalle Investment Management [Member]                      
Summary of equity method investments [Abstract]                      
Guarantor Obligations, Maximum Exposure, Undiscounted 314.7               314.7    
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]                      
Summary of equity method investments [Abstract]                      
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net 65.5       37.0       65.5 37.0  
Consolidated Variable Interest Entities [Member]                      
Summary of equity method investments [Abstract]                      
Property and equipment, net 126.3       48.5       126.3 48.5  
Investments In Real Estate Ventures 13.2       14.0       13.2 14.0  
Other Assets 14.3       4.4       14.3 4.4  
Total assets 153.8       66.9       153.8 66.9  
Other Liabilities, Current 3.2       0.9       3.2 0.9  
Loans Payable, Fair Value Disclosure 69.7       28.2       69.7 28.2  
Total liabilities 72.9       29.1       72.9 29.1  
Members' Equity 80.9       37.8       80.9 37.8  
Total liabilities and equity $ 153.8       $ 66.9       153.8 66.9  
Revenues                 7.6 5.8 5.9
Other Expenses                 (8.6) (5.1) (4.2)
Gains on Sales of Investments                 0.0 2.0 0.0
Net income                 $ (1.0) $ 2.7 $ 1.7