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Investments in Real Estate Ventures (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
investment
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
investment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]          
Total investments in real estate ventures $ 359.9   $ 359.9   $ 311.5
Number of separate property or fund co-investments | investment 52   52    
Minimum ownership percentage in real estate ventures (in hundredths) 1.00%   1.00%    
Maximum ownership percentage in real estate ventures (in hundredths) 15.00%   15.00%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 143.6   $ 143.6    
Property, Plant and Equipment, Net 468.7   468.7   423.3
Total assets 7,116.6   7,116.6   6,187.1
Other Liabilities, Noncurrent 309.6   309.6   208.5
Total liabilities 4,261.7   4,261.7   3,457.7
Total liabilities and equity 7,116.6   7,116.6   6,187.1
Revenue 1,705.2 $ 1,501.3 4,645.6 $ 4,078.2  
Net income 48.2 113.2 167.8 247.9  
Impairment [Abstract]          
Impairment charges 0.2 0.1 0.9 4.2  
Fair Value [Abstract]          
Fair value investments at beginning of the period     155.2 113.6  
Investments     59.8 28.0  
Distributions     (32.6) (5.6)  
Unrealized Gain (Loss) on Investments     14.2 18.5  
Foreign currency translation adjustments, net     7.4 (4.2)  
Fair value investments at end of the period $ 204.0 150.3 $ 204.0 150.3  
LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Partnership ownership interest (in hundredths) 48.78%   48.78%    
Unfunded capital commitments to the underlying funds for future funding of co-investments $ 70.4   $ 70.4    
Revolving credit facility, maximum capacity 10.0   10.0    
Guarantor Obligations, Maximum Exposure, Undiscounted 69.6   69.6    
Entity share of Unfunded Capital Commitments for Future Fundings 34.4   34.4    
Entity Share Of Exposure On Outstanding Borrowings 0.9   0.9    
Entity's maximum exposure, assuming facility was fully drawn 4.9   4.9    
Equity Method Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Total investments in real estate ventures 10.1   10.1   6.6
Property, Plant and Equipment, Net 13.9   13.9   32.6
Other Assets 77.8   77.8   4.9
Total assets 101.8   101.8   44.1
Other Liabilities, Noncurrent 9.7   9.7   25.8
Due to Related Parties 37.3   37.3   0.0
Total liabilities 47.0   47.0   25.8
Members' Equity 54.8   54.8   18.3
Total liabilities and equity 101.8   101.8   $ 44.1
Revenue 2.6 4.6 5.6 7.1  
Other Expenses (3.7) (1.0) (5.7) (2.8)  
Gains (Losses) on Sales of Investment Real Estate 0.0 0.0 13.3 1.3  
Gains on Sales of Investment Real Estate, Proportionate Share, Equity Method       3.3  
Net income $ (1.1) $ 3.6 $ 13.2 $ 5.6