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Investments in Real Estate Ventures (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
investment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of separate property or fund co-investments | investment 52    
Minimum ownership percentage in real estate ventures (in hundredths) 1.00%    
Maximum ownership percentage in real estate ventures (in hundredths) 10.00%    
Line of credit facility, maximum borrowing capacity $ 1,025,000,000 $ 650,000,000  
Summary of equity method investments [Abstract]      
Property and equipment, net 501,000,000 423,300,000  
Investments In Real Estate Ventures 355,400,000 311,500,000  
Total assets 7,629,400,000 6,187,100,000  
Mortgage indebtedness 367,100,000 208,500,000  
Total liabilities 4,807,900,000 3,457,700,000  
Total liabilities and equity 7,629,400,000 6,187,100,000  
Total segment revenue 6,803,800,000 5,965,700,000 $ 5,429,600,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 334,400,000 446,300,000 388,000,000
Balance Sheet [Abstract]      
Investments in real estate, net of depreciation 14,780,700 12,216,700  
Total assets 16,728,200 13,993,900  
Mortgage indebtedness 5,480,600 4,345,900  
Other borrowings 502,000 628,200  
Total liabilities 6,729,700 5,608,300  
Total equity 9,998,500 8,385,600  
Statements of Operations [Abstract]      
Revenue 1,266,800 1,473,600 1,397,600
Net income (loss) 874,700 1,179,500 1,099,100
Impairment [Abstract]      
Impairment charges 1,700,000 6,000,000 2,400,000
Fair Value [Abstract]      
Fair value investments at beginning of the period 155,200,000 113,600,000 78,900,000
Investments 105,800,000 33,800,000 35,200,000
Distributions (62,100,000) (9,000,000) (3,100,000)
Net fair value gain 16,600,000 21,100,000 7,100,000
Foreign currency translation adjustments, net (2,800,000) (4,300,000) (4,500,000)
Fair value investments at end of the period 212,700,000 155,200,000 113,600,000
LaSalle Investment Company II [Member]      
Schedule of Equity Method Investments [Line Items]      
Unfunded capital commitments to the underlying funds for future funding of co-investments 61,500,000    
Line of credit facility, maximum borrowing capacity $ 10,000,000    
Summary of equity method investments [Abstract]      
Our effective ownership interest in co-investment vehicle 48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 68,800,000    
Entity share of Unfunded Capital Commitments for Future Fundings 30,000,000    
Our share of exposure on outstanding borrowings 700,000    
Loss Contingency, Estimate of Possible Loss 4,900,000    
Exclusive of LaSalle Investment Company II [Member]      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted 139,800,000    
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 7,300,000 2,100,000  
Consolidated Variable Interest Entities [Member]      
Summary of equity method investments [Abstract]      
Property and equipment, net 13,800,000 32,600,000  
Investments In Real Estate Ventures 10,300,000 6,600,000  
Other Assets 40,700,000 4,900,000  
Total assets 64,800,000 44,100,000  
Mortgage indebtedness 9,700,000 25,800,000  
Other liabilities 35,000,000 0  
Total liabilities 44,700,000 25,800,000  
Members' Equity 20,100,000 18,300,000  
Total liabilities and equity 64,800,000 44,100,000  
Total segment revenue 6,600,000 8,500,000 4,200,000
Other Expenses (7,100,000) (3,900,000) (3,900,000)
Gains on Sales of Investments 13,300,000 1,400,000 0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 12,800,000 6,000,000 $ 300,000
Gain on Sales of Investment Real Estate, Proportionate Share, Equity Method   $ 3,300,000