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Investments in Real Estate Ventures (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
investment
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
investment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted $ 97.1   $ 97.1    
Number of separate property or fund co-investments | investment 51   51    
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%    
Property, Plant and Equipment, Net $ 432.4   $ 432.4   $ 423.3
Total investments in real estate ventures 357.8   357.8   311.5
Assets 6,341.3   6,341.3   6,187.1
Other Liabilities, Noncurrent 238.1   238.1   208.5
Liabilities 3,524.7   3,524.7   3,457.7
Liabilities and Equity 6,341.3   6,341.3   6,187.1
Revenue 1,603.6 $ 1,373.5 2,940.4 $ 2,577.0  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 94.4 91.4 119.6 134.7  
Impairment [Abstract]          
Impairment charges 0.2 0.6 0.7 4.2  
Fair Value [Abstract]          
Fair value investments at beginning of the period     155.2 113.6  
Investments     52.0 22.7  
Distributions     21.9 2.7  
Unrealized Gain (Loss) on Investments     12.2 7.0  
Foreign currency translation adjustments, net     6.3 (1.6)  
Fair value investments at end of the period 203.8 139.0 203.8 139.0  
LaSalle Investment Company II [Member]          
Schedule of Equity Method Investments [Line Items]          
Guarantor Obligations, Maximum Exposure, Undiscounted $ 69.9   $ 69.9    
Partnership ownership interest (in hundredths) 48.78%   48.78%    
Unfunded capital commitments to the underlying funds for future funding of co-investments $ 72.5   $ 72.5    
Revolving credit facility, maximum capacity 10.0   10.0    
Entity share of Unfunded Capital Commitments for Future Fundings 35.4   35.4    
Entity Share Of Exposure On Outstanding Borrowings 3.6   3.6    
Entity's maximum exposure, assuming facility was fully drawn 4.9   4.9    
Consolidated Variable Interest Entities [Member]          
Schedule of Equity Method Investments [Line Items]          
Property, Plant and Equipment, Net 13.9   13.9   32.6
Total investments in real estate ventures 7.0   7.0   6.6
Other Assets 43.2   43.2   4.9
Assets 64.1   64.1   44.1
Other Liabilities, Noncurrent 9.8   9.8   25.8
Due to Related Parties 0.9   0.9   0.0
Liabilities 10.7   10.7   25.8
Members' Equity 53.4   53.4   18.3
Liabilities and Equity 64.1   64.1   $ 44.1
Revenue 1.1 1.3 3.0 2.4  
Other Expenses (0.1) (0.9) (2.0) (1.8)  
Gains (Losses) on Sales of Investment Real Estate 13.3 0.0 13.3 1.3  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 14.3 $ 0.4 $ 14.3 $ 1.9