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Investments in Real Estate Ventures (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
investment
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
investment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]          
Investments in real estate ventures $ 372.5   $ 372.5   $ 355.4
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%    
Property, Plant and Equipment, Net, consolidated VIE $ 516.6   $ 516.6   501.0
Investments in real estate ventures, consolidated VIE 372.5   372.5   355.4
Total assets 7,554.3   7,554.3   7,629.4
Other Liabilities, Noncurrent, consolidated VIE 177.5   177.5   161.3
Total liabilities 4,379.0   4,379.0   4,807.9
Total liabilities and equity 7,554.3   7,554.3   7,629.4
Revenue, consolidated VIE 1,947.0 $ 1,705.2 5,396.9 $ 4,645.6  
Net income 87.5 48.2 177.5 167.8  
Fair Value [Abstract]          
Fair value investments at beginning of the period     212.7 155.2  
Investments in Real Estate Ventures, at Fair Value, Additions     21.2 59.8  
Investments in Real Estate Ventures, at Fair Value, Distributions     22.5 32.6  
Unrealized Gain (Loss) on Investments     17.9 14.2  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation     4.9 7.4  
Fair value investments at end of the period $ 234.2 204.0 $ 234.2 204.0  
LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Partnership ownership interest (in hundredths) 48.78%   48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 65.4   $ 65.4    
Exclusive of LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 222.2   222.2    
Equity Method Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments in real estate ventures 9.1   9.1   10.3
Property, Plant and Equipment, Net, consolidated VIE 13.5   13.5   13.8
Investments in real estate ventures, consolidated VIE 9.1   9.1   10.3
Other Assets, consolidated VIE 40.0   40.0   40.7
Total assets 62.6   62.6   64.8
Other Liabilities, Noncurrent, consolidated VIE 31.2   31.2   35.0
Loans Payable, Fair Value Disclosure, consolidated VIE 9.3   9.3   9.7
Total liabilities 40.5   40.5   44.7
Members' Equity, consolidated VIE 22.1   22.1   20.1
Total liabilities and equity 62.6   62.6   $ 64.8
Revenue, consolidated VIE 1.8 2.6 4.4 5.6  
Other Expenses, consolidated VIE (1.6) (3.7) (3.6) (5.7)  
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE 0.0 0.0 0.0 13.3  
Net income $ 0.2 $ (1.1) $ 0.8 $ 13.2