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Investment Debt - Narrative (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2014
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
investment
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
EUR (€)
Sep. 30, 2017
GBP (£)
Dec. 31, 2016
Sep. 30, 2016
GBP (£)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
GBP (£)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
GBP (£)
Aug. 31, 2014
GBP (£)
Debt Instrument [Line Items]                              
Unrealized foreign currency translation gain (loss) | $   $ 50.5 $ (1.1) $ 171.3 $ (61.7)                    
Number of investments partially financed with mortgages | investment       1                      
Number of acquisitions partially financed with mortgages | investment       6                      
Number of properties that acquired supplemental financing | investment       1                      
Euro Member Countries, Euro [Member]                              
Debt Instrument [Line Items]                              
Unrealized foreign currency translation gain (loss) | $       $ (17.9)                      
Secured Investment Debt [Member]                              
Debt Instrument [Line Items]                              
Weighted-average interest rate of investment debt   3.39%   3.39%       3.39% 3.33%            
Percent of property level debt with fixed rate   68.00%   68.00%       68.00% 75.00%            
Percent of property level debt with floating rate and interest caps   15.00%   15.00%       15.00% 15.00%            
Percent of property level debt with floating rate, without interest caps   17.00%   17.00%       17.00% 10.00%            
Secured Investment Debt [Member] | KWE [Member] | KWE Facility [Member] | Revolving Credit Facility [Member]                              
Debt Instrument [Line Items]                              
Debt instrument term 3 years                            
Maximum borrowing capacity $ 301.5                           £ 225,000,000
Remaining borrowing capacity   $ 301.5   $ 301.5       £ 225,000,000              
Secured Investment Debt [Member] | KWE [Member] | United Kingdom [Member] | Mortgage Loans, Unsecured [Member]                              
Debt Instrument [Line Items]                              
Debt face value     $ 268.0   $ 268.0         £ 200,000,000     $ 401.9 £ 300,000,000  
Stated interest rate     3.95%   3.95%         3.95%     3.95% 3.95%  
Effective interest rate     3.35%   3.35%         3.35%          
Percentage of proceeds converted to Euros with swaps     50.00%                        
Maximum percentage of total assets   60.00%   60.00%       60.00%              
Maximum ratio of consolidated secured indebtedness to total assets   50.00%   50.00%       50.00%              
Interest coverage ratio   1.50   1.50       1.50              
Maximum ratio of unencumbered assets to unsecured indebtedness   125.00%   125.00%       125.00%              
Secured Investment Debt [Member] | KWE [Member] | United Kingdom [Member] | Euro Medium Term Note [Member]                              
Debt Instrument [Line Items]                              
Debt face value                     $ 2,700.0 £ 2,000,000,000      
Proceeds from issuance of debt           $ 649.8 € 550                
Long-term debt | $   $ 645.9   $ 645.9                      
Annual fixed coupon rate     3.25%   3.25%         3.25%