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Real Estate and In-Place Lease Value - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Property
Sep. 30, 2014
USD ($)
Business Acquisition [Line Items]        
Acquisition-related gains $ 29.9 $ 28.9 $ 87.2 $ 199.2
Leases, Acquired-in-Place [Member]        
Business Acquisition [Line Items]        
Acquired in-place lease estimated useful life     7 years 9 months 18 days  
Maximum [Member] | Building and Building Improvements [Member]        
Business Acquisition [Line Items]        
Buildings and building improvements estimated lives     40 years  
Multifamily [Member] | Japan [Member]        
Business Acquisition [Line Items]        
Net gain on sale of properties     $ 33.5  
Commercial [Member] | KWE [Member]        
Business Acquisition [Line Items]        
Net gain on sale of properties     $ 11.3  
Number of commercial real estate properties sold | Property     11