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KWE Unsecured Bonds - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Unrealized foreign currency translation gain $ 16.8   $ 18.3    
KWE [Member]          
Debt Instrument [Line Items]          
Unrealized foreign currency translation gain 25.4        
KWE [Member] | KWE Unsecured Bonds [Member]          
Debt Instrument [Line Items]          
Mortgage debt (excluding loan fees) $ 1,220.4       $ 1,277.6
Maximum percentage of total assets 60.00%     60.00%  
Maximum ratio of consolidated secured indebtedness to total assets 50.00%     50.00%  
Interest coverage ratio 1.50     1.50  
Maximum ratio of unencumbered assets to unsecured indebtedness 125.00%     125.00%  
KWE [Member] | KWE Unsecured Bonds [Member] | KWE Bonds [Member]          
Debt Instrument [Line Items]          
Debt face value | £       £ 500,000,000  
Interest rate (as a percent) 3.95%     3.95%  
Mortgage debt (excluding loan fees) $ 619.8       662.9
Effective interest rate 3.35%     3.35%  
Percentage of proceeds converted to Euros with swaps 50.00% 50.00%      
KWE [Member] | KWE Unsecured Bonds [Member] | KWE Euro Medium Term Note Programme [Member]          
Debt Instrument [Line Items]          
Debt face value $ 2,500.0     £ 2,000,000,000.0  
Mortgage debt (excluding loan fees) 600.6       $ 614.7
Proceeds from issuance of debt $ 603.4 € 550,000,000      
Annual fixed coupon rate 3.25%     3.25%