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Investments in Real Estate Ventures (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
investment
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
investment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]          
Investments in real estate ventures $ 379.5   $ 379.5   $ 376.2
Number of separate property or fund co-investments | investment 43   43    
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 $ 536.4   $ 536.4   543.9
Total assets 9,187.7   9,187.7   9,254.4
Other Liabilities, Current 203.1   203.1   256.8
Total liabilities 5,721.5   5,721.5   5,872.4
Total liabilities and equity 9,187.7   9,187.7   9,254.4
Revenue, consolidated VIE 3,903.7 $ 3,470.3 7,458.9 $ 6,588.0  
Net income 109.8 94.9 152.4 102.6  
Fair Value [Abstract]          
Fair value investments at beginning of the period     242.3 212.7  
Investments in Real Estate Ventures, at Fair Value, Additions     11.1 19.2  
Investments in Real Estate Ventures, at Fair Value, Distributions     29.0 18.6  
Unrealized Gain (Loss) on Investments     13.6 10.7  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation     0.7 4.0  
Fair value investments at end of the period $ 238.7 228.0 $ 238.7 228.0  
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 $ 60.4   $ 60.4    
Exclusive of LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted 197.5   197.5    
Equity Method Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments in real estate ventures 13.8   13.8   12.6
Property, Plant and Equipment, Net, consolidated VIE 36.8   36.8   15.7
Other Assets, consolidated VIE 8.8   8.8   44.4
Total assets 59.4   59.4   72.7
Other Liabilities, Current 1.1   1.1   30.9
Loans Payable, Fair Value Disclosure, consolidated VIE 26.0   26.0   9.2
Total liabilities 27.1   27.1   40.1
Members' Equity, consolidated VIE 32.3   32.3   32.6
Total liabilities and equity 59.4   59.4   $ 72.7
Revenue, consolidated VIE 1.7 1.0 2.7 2.6  
Other Expenses, consolidated VIE (1.6) (0.8) (2.4) (2.0)  
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE 0.5 0.0 2.0 0.0  
Net income $ 0.6 $ 0.2 $ 2.3 $ 0.6