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Investment Debt (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Loan
Investment
acquisition
Sep. 30, 2014
USD ($)
Jun. 30, 2015
GBP (£)
Dec. 31, 2014
USD ($)
Aug. 31, 2014
GBP (£)
Debt Instrument [Line Items]              
Borrowings under line of credit     $ 75.0 $ 90.0      
Repayments of lines of credit     $ 200.0 $ 90.0      
Number of acquisitions partially financed with mortgages | acquisition     5        
Number of investments partially financed with mortgages | Investment     5        
Number of mortgages consolidated | Loan     3        
Number of investments with existing mortgages refinanced | Investment     11        
KWE [Member]              
Debt Instrument [Line Items]              
Ownership percentage by parent     17.70%        
Japan [Member] | Multifamily [Member]              
Debt Instrument [Line Items]              
Prepayment penalty   $ 7.1          
Mortgage Loans Payable [Member]              
Debt Instrument [Line Items]              
Long-term debt     $ 2,849.7     $ 2,195.9  
Debt unamortized premium     $ 1.9     $ 15.4  
Weighted average interest rate of debt     3.16%     3.03%  
Percent of debt with fixed rate     63.00%     43.00%  
Percent of debt with floating interest rate and interest caps     19.00%     38.00%  
Percent of debt with floating interest rate, without interest caps     18.00%     19.00%  
Investment Debt [Member]              
Debt Instrument [Line Items]              
Long-term debt     $ 3,296.6     $ 2,195.9  
Debt unamortized premium     1.9        
Mortgage Loans Secured by Multi-Family Properties [Member] | Mortgage Loans Payable [Member] | Western United States [Member]              
Debt Instrument [Line Items]              
Long-term debt     824.7     565.5  
Mortgage Loans Secured by Multi-Family Properties [Member] | Mortgage Loans Payable [Member] | Japan [Member]              
Debt Instrument [Line Items]              
Long-term debt     0.0     242.9  
Mortgage Loans Secured by Multi-Family Properties [Member] | Mortgage Loans Payable [Member] | Ireland [Member]              
Debt Instrument [Line Items]              
Long-term debt     192.6     133.6  
Mortgage Loans Secured by Multi-Family Properties [Member] | Mortgage Loans Payable [Member] | Ireland [Member] | KWE [Member]              
Debt Instrument [Line Items]              
Long-term debt     53.0     40.3  
Mortgage Loans Secured by Commercial Buildings [Member] | Mortgage Loans Payable [Member] | Western United States [Member]              
Debt Instrument [Line Items]              
Long-term debt     256.6     131.0  
Mortgage Loans Secured by Commercial Buildings [Member] | Mortgage Loans Payable [Member] | Japan [Member]              
Debt Instrument [Line Items]              
Long-term debt     2.1     2.1  
Mortgage Loans Secured by Commercial Buildings [Member] | Mortgage Loans Payable [Member] | Ireland [Member]              
Debt Instrument [Line Items]              
Long-term debt     391.5     412.5  
Mortgage Loans Secured by Commercial Buildings [Member] | Mortgage Loans Payable [Member] | Ireland [Member] | KWE [Member]              
Debt Instrument [Line Items]              
Long-term debt     295.1     323.8  
Mortgage Loans Secured by Commercial Buildings [Member] | Mortgage Loans Payable [Member] | United Kingdom [Member]              
Debt Instrument [Line Items]              
Long-term debt     1,054.7     569.2  
Mortgage Loans Secured by Commercial Buildings [Member] | Mortgage Loans Payable [Member] | United Kingdom [Member] | KWE [Member]              
Debt Instrument [Line Items]              
Long-term debt     969.4     483.0  
Mortgage Loans Secured by Hotel [Member] | Mortgage Loans Payable [Member] | Western United States [Member]              
Debt Instrument [Line Items]              
Long-term debt     39.5     37.2  
Mortgage Loans Secured by Hotel [Member] | Mortgage Loans Payable [Member] | Ireland [Member]              
Debt Instrument [Line Items]              
Long-term debt     80.5     72.9  
Mortgage Loans Secured by Residential and Other [Member] | Mortgage Loans Payable [Member] | Ireland [Member]              
Debt Instrument [Line Items]              
Long-term debt     4.0     29.0  
Mortgage Loans Secured by Residential and Other [Member] | Mortgage Loans Payable [Member] | Ireland [Member] | KWE [Member]              
Debt Instrument [Line Items]              
Long-term debt     0.0     14.6  
Mortgage Loans Secured by Residential and Other [Member] | Mortgage Loans Payable [Member] | Spain [Member]              
Debt Instrument [Line Items]              
Long-term debt     3.5     0.0  
Mortgage Loans Secured by Residential and Other [Member] | Mortgage Loans Payable [Member] | Spain [Member] | KWE [Member]              
Debt Instrument [Line Items]              
Long-term debt     3.5     0.0  
Mortgage Loans, Unsecured [Member] | Mortgage Loans Payable [Member] | United Kingdom [Member]              
Debt Instrument [Line Items]              
Long-term debt     $ 446.9     0.0  
Face value   $ 454.0     £ 300,000,000    
Interest rate   3.95%     3.95%    
Effective interest rate     3.35%        
Percentage of proceeds converted to Euros with swaps     50.00%        
Maximum percentage of total assets     60.00%        
Maximum ratio of consolidated secured indebtedness to total assets     50.00%        
Interest coverage ratio     1.50        
Maximum ratio of unencumbered assets to unsecured indebtedness     125.00%        
Mortgage Loans, Unsecured [Member] | Unsecured Debt [Member] | United Kingdom [Member]              
Debt Instrument [Line Items]              
Long-term debt     $ 446.9     $ 0.0  
KWE Facility [Member] | Mortgage Loans Payable [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt instrument term 3 years            
Maximum borrowing capacity $ 340.5           £ 225,000,000
Borrowings under line of credit     55.7        
Repayments of lines of credit     56.0        
Maximum amount drawn on the unsecured credit facility at any one point     $ 56.0        
Remaining borrowing capacity $ 340.5           £ 225,000,000