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KWE UNSECURED BONDS - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Gain (loss) on early extinguishment of debt $ 27.5   $ (45.7) $ (9.3)
KWE | Foreign Exchange Contract, Three | Level 2 | Designated as Hedging Instrument        
Debt Instrument [Line Items]        
Change in Unrealized Gains (28.3)      
KWE unsecured bonds | KWE        
Debt Instrument [Line Items]        
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%    
KWE unsecured bonds | KWE | KWE Euro Medium Term Note Programme        
Debt Instrument [Line Items]        
Proceeds from issuance of debt $ (80.3) € (75,000,000)    
Annual fixed coupon rate   3.25%    
Percentage of par value 82.00% 82.00%    
Gain (loss) on early extinguishment of debt $ 13.9      
Debt Instrument, Face Amount | €   € 150,000,000    
KWE unsecured bonds | KWE | KWE Notes        
Debt Instrument [Line Items]        
Proceeds from issuance of debt | €   € (550,000,000)