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Investments in Real Estate Ventures (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
investment
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
investment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]          
Investments in real estate ventures $ 364.2   $ 364.2   $ 355.4
Number of separate property or fund co-investments | investment 49   49    
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 $ 512.9   $ 512.9   501.0
Investments in real estate ventures, consolidated VIE 364.2   364.2   355.4
Total assets 7,897.9   7,897.9   7,629.4
Other Liabilities, Noncurrent, consolidated VIE 166.5   166.5   161.3
Total liabilities 4,860.2   4,860.2   4,807.9
Total liabilities and equity 7,897.9   7,897.9   7,629.4
Revenue, consolidated VIE 1,834.7 $ 1,603.6 3,449.9 $ 2,940.4  
Net income 78.7 94.4 90.0 119.6  
Fair Value [Abstract]          
Fair value investments at beginning of the period     212.7 155.2  
Investments in Real Estate Ventures, at Fair Value, Additions     19.2 52.0  
Investments in Real Estate Ventures, at Fair Value, Distributions     18.6 21.9  
Unrealized Gain (Loss) on Investments     10.7 12.2  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation     4.0 6.3  
Fair value investments at end of the period $ 228.0 203.8 $ 228.0 203.8  
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 $ 68.0   $ 68.0    
Exclusive of LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 215.3   215.3    
Equity Method Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments in real estate ventures 10.4   10.4   10.3
Property, Plant and Equipment, Net, consolidated VIE 13.6   13.6   13.8
Investments in real estate ventures, consolidated VIE 10.4   10.4   10.3
Other Assets, consolidated VIE 40.2   40.2   40.7
Total assets 64.2   64.2   64.8
Loans Payable, Fair Value Disclosure, consolidated VIE 9.3   9.3   9.7
Other Liabilities, Noncurrent, consolidated VIE 31.3   31.3   35.0
Total liabilities 40.6   40.6   44.7
Members' Equity, consolidated VIE 23.6   23.6   20.1
Total liabilities and equity 64.2   64.2   $ 64.8
Revenue, consolidated VIE 1.0 1.1 2.6 3.0  
Other Expenses, consolidated VIE (0.8) (0.1) (2.0) (2.0)  
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE 0.0 13.3 0.0 13.3  
Net income $ 0.2 $ 14.3 $ 0.6 $ 14.3