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Investments in Real Estate Ventures (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
investment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]      
Investments in real estate ventures $ 381.0   $ 376.2
Number of separate property or fund co-investments | investment 43    
Minimum ownership percentage in real estate ventures (in hundredths) 1.00%    
Maximum ownership percentage in real estate ventures (in hundredths) 10.00%    
Property, Plant and Equipment, Net, consolidated VIE $ 561.9   543.9
Total assets 9,204.2   9,254.4
Other Liabilities, Noncurrent, consolidated VIE 361.3   332.3
Total liabilities 5,728.5   5,872.4
Total liabilities and equity 9,204.2   9,254.4
Revenue, consolidated VIE 3,555.2 $ 3,117.7  
Net income 42.6 7.7  
Fair Value [Abstract]      
Fair value investments at beginning of the period 242.3 212.7  
Investments in Real Estate Ventures, at Fair Value, Additions 2.6 9.0  
Investments in Real Estate Ventures, at Fair Value, Distributions 22.5 9.6  
Unrealized Gain (Loss) on Investments 5.8 (1.7)  
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation 5.3 3.6  
Fair value investments at end of the period $ 233.5 214.0  
LaSalle Investment Company II [Member]      
Schedule of Equity Method Investments [Line Items]      
Partnership ownership interest (in hundredths) 48.78%    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 61.6    
Exclusive of LaSalle Investment Company II [Member]      
Schedule of Equity Method Investments [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 209.8    
Equity Method Investments [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in real estate ventures 13.7   12.6
Property, Plant and Equipment, Net, consolidated VIE 42.7   15.7
Other Assets, consolidated VIE 9.3   44.4
Total assets 65.7   72.7
Other Liabilities, Noncurrent, consolidated VIE 0.9   30.9
Loans Payable, Fair Value Disclosure, consolidated VIE 29.8   9.2
Total liabilities 30.7   40.1
Members' Equity, consolidated VIE 35.0   32.6
Total liabilities and equity 65.7   $ 72.7
Revenue, consolidated VIE 1.0 1.6  
Other Expenses, consolidated VIE (0.8) (1.2)  
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE 1.5 0.0  
Net income $ 1.7 $ 0.4