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Investments in Real Estate Ventures (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
investment
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Investments in Real Estate Ventures, at Fair Value, Additions $ 9.0 $ 50.9  
Investments in Real Estate Ventures, at Fair Value, Distributions 9.6 16.2  
Property, Plant and Equipment, Net 507.0   $ 501.0
Total investments in real estate ventures $ 352.1   355.4
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%    
Total assets $ 7,236.0   7,629.4
Other Liabilities, Noncurrent 162.5   161.3
Total liabilities 4,334.1   4,807.9
Total liabilities and equity 7,236.0   7,629.4
Revenue 1,615.2 1,336.8  
Net income 11.3 25.2  
Fair Value [Abstract]      
Fair value investments at beginning of the period 212.7 155.2  
Unrealized Gain (Loss) on Investments (1.7) 10.3  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation 3.6 2.1  
Fair value investments at end of the period $ 214.0 202.3  
LaSalle Investment Company II [Member]      
Schedule of Equity Method Investments [Line Items]      
Partnership ownership interest (in hundredths) 48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 68.4    
Exclusive of LaSalle Investment Company II [Member]      
Schedule of Equity Method Investments [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 217.3    
Equity Method Investments [Member]      
Schedule of Equity Method Investments [Line Items]      
Property, Plant and Equipment, Net 13.7   13.8
Total investments in real estate ventures 10.3   10.3
Other Assets 39.5   40.7
Total assets 63.5   64.8
Loans Payable, Fair Value Disclosure 9.6   9.7
Other Liabilities, Noncurrent 25.4   35.0
Total liabilities 35.0   44.7
Members' Equity 28.5   20.1
Total liabilities and equity 63.5   $ 64.8
Revenue 1.6 1.9  
Other Expenses (1.2) (1.9)  
Net income $ 0.4 $ 0.0