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Investments in Real Estate Ventures (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
investment
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
investment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Number of separate property or fund co-investments | investment 45               45    
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 $ 567.9       $ 543.9       $ 567.9 $ 543.9  
Investments In Real Estate Ventures 356.9       376.2       356.9 376.2  
Total assets 10,025.5       9,254.4       10,025.5 9,254.4  
Other Liabilities, Current 185.7       256.8       185.7 256.8  
Mortgage indebtedness 387.3       332.3       387.3 332.3  
Total liabilities 6,291.0       5,872.4       6,291.0 5,872.4  
Total liabilities and equity 10,025.5       9,254.4       10,025.5 9,254.4  
Revenues 4,889.7 $ 3,969.8 $ 3,903.7 $ 3,555.2 4,343.0 $ 3,522.2 $ 3,470.3 $ 3,117.7 16,318.4 14,453.2 $ 12,991.2
Net income                 491.7 279.5 345.9
Balance Sheet [Abstract]                      
Investments in real estate, net of depreciation 13,217.7       17,407.4       13,217.7 17,407.4  
Total assets 15,561.2       19,589.7       15,561.2 19,589.7  
Mortgage indebtedness 4,968.0       6,170.5       4,968.0 6,170.5  
Other borrowings 561.7       926.3       561.7 926.3  
Total liabilities 6,155.8       8,301.1       6,155.8 8,301.1  
Total equity 9,405.4       11,288.6       9,405.4 11,288.6  
Statements of Operations [Abstract]                      
Revenue                 1,199.5 1,319.0 1,266.8
Net income (loss)                 1,046.3 895.7 874.7
Fair Value [Abstract]                      
Fair value investments at beginning of the period       $ 242.3       $ 212.7 242.3 212.7 155.2
Investments in Real Estate Ventures, at Fair Value, Additions                 55.2 33.5 105.8
Investments in Real Estate Ventures, at Fair Value, Distributions                 63.8 37.1 62.1
Net fair value gain                 13.9 28.1 16.6
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation                 (0.3) 5.1 (2.8)
Fair value investments at end of the period $ 247.3       242.3       $ 247.3 242.3 212.7
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 240.6               240.6    
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 37.0       7.8       37.0 7.8  
Consolidated Variable Interest Entities [Member]                      
Summary of equity method investments [Abstract]                      
Property and equipment, net 48.5       15.7       48.5 15.7  
Investments In Real Estate Ventures 14.0       12.6       14.0 12.6  
Other Assets 4.4       44.4       4.4 44.4  
Total assets 66.9       72.7       66.9 72.7  
Other Liabilities, Current 0.9       30.9       0.9 30.9  
Loans Payable, Fair Value Disclosure 28.2       9.2       28.2 9.2  
Total liabilities 29.1       40.1       29.1 40.1  
Members' Equity 37.8       32.6       37.8 32.6  
Total liabilities and equity $ 66.9       $ 72.7       66.9 72.7  
Revenues                 5.8 5.9 6.6
Other Expenses                 (5.1) (4.2) (7.1)
Gains on Sales of Investments                 2.0 0.0 13.3
Net income                 $ 2.7 $ 1.7 $ 12.8