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Investments in Real Estate Ventures (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
investment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of separate property or fund co-investments | investment 44    
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 $ 850.0 $ 1,025.0  
Summary of equity method investments [Abstract]      
Property and equipment, net 543.9 501.0  
Investments In Real Estate Ventures 376.2 355.4  
Total assets 8,014.5 7,629.4  
Mortgage indebtedness 332.3 161.3  
Total liabilities 4,729.4 4,807.9  
Total liabilities and equity 8,014.5 7,629.4  
Total segment revenue 7,932.4 6,803.8 $ 5,965.7
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 257.3 334.4 446.3
Balance Sheet [Abstract]      
Investments in real estate, net of depreciation 17,407.4 14,780.7  
Total assets 19,589.7 16,728.2  
Mortgage indebtedness 6,170.5 5,480.6  
Other borrowings 926.3 502.0  
Total liabilities 8,301.1 6,729.7  
Total equity 11,288.6 9,998.5  
Statements of Operations [Abstract]      
Revenue 1,319.0 1,266.8 1,473.6
Net income (loss) 895.7 874.7 1,179.5
Impairment [Abstract]      
Impairment charges 1.2 1.7 6.0
Fair Value [Abstract]      
Fair value investments at beginning of the period 212.7 155.2 113.6
Investments in Real Estate Ventures, at Fair Value, Additions 33.5 105.8 33.8
Investments in Real Estate Ventures, at Fair Value, Distributions 37.1 62.1 9.0
Net fair value gain 28.1 16.6 21.1
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation 5.1 (2.8) (4.3)
Fair value investments at end of the period $ 242.3 212.7 155.2
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 $ 216.5    
LaSalle Investment Management [Member]      
Summary of equity method investments [Abstract]      
Guarantor Obligations, Maximum Exposure, Undiscounted 65.4    
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 7.8 7.3  
Consolidated Variable Interest Entities [Member]      
Summary of equity method investments [Abstract]      
Property and equipment, net 15.7 13.8  
Investments In Real Estate Ventures 12.6 10.3  
Other Assets 44.4 40.7  
Total assets 72.7 64.8  
Mortgage indebtedness 30.9 35.0  
Loans Payable, Fair Value Disclosure 9.2 9.7  
Total liabilities 40.1 44.7  
Members' Equity 32.6 20.1  
Total liabilities and equity 72.7 64.8  
Total segment revenue 5.9 6.6 8.5
Other Expenses 4.2 7.1 (3.9)
Gains on Sales of Investments 0.0 13.3 1.4
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 1.7 12.8 $ 6.0
Gain on Sales of Investment Real Estate, Proportionate Share, Equity Method   $ 3.3