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KW UNSECURED DEBT - Senior Notes (Details)
12 Months Ended
Apr. 01, 2021
USD ($)
Feb. 11, 2021
USD ($)
Feb. 09, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Aug. 23, 2021
USD ($)
Mar. 15, 2021
USD ($)
Jan. 27, 2021
USD ($)
Debt Instrument [Line Items]                  
Gain on extinguishment of debt       $ (27,500,000) $ 45,700,000 $ 9,300,000      
Senior Notes | Maximum                  
Debt Instrument [Line Items]                  
Balance sheet leverage ratio       1.50          
Balance sheet leverage ratio at period end       1.15          
4.75% Senior Notes Due 2029 | Senior Notes                  
Debt Instrument [Line Items]                  
Debt face value   $ 500,000,000           $ 100,000,000  
Interest rate (as a percent)   4.75%              
Gain on extinguishment of debt     $ 14,800,000   11,700,000        
Amount of extinguishment of debt $ 573,100,000                
5% Senior Notes Due 2031 | Senior Notes                  
Debt Instrument [Line Items]                  
Debt face value   $ 500,000,000           $ 100,000,000  
Interest rate (as a percent)   5.00%              
Senior Notes Due 2030 | Senior Notes                  
Debt Instrument [Line Items]                  
Debt face value             $ 600,000,000    
Interest rate (as a percent)             4.75%    
4.75% Senior Notes Due 2029 and 5% Senior Notes Due 2031 | Senior Notes                  
Debt Instrument [Line Items]                  
Redemption percentage of principal   100.00%              
Redemption percentage of debt option   40.00%              
4.75% Senior Notes Due 2029 and 5% Senior Notes Due 2031 | Senior Notes | Maximum                  
Debt Instrument [Line Items]                  
Redemption percentage of principal   101.00%              
5.875% Senior Notes Due 2024 | Senior Notes                  
Debt Instrument [Line Items]                  
Debt face value         $ 1,200,000,000        
Interest rate (as a percent)         5.875%        
Repurchased face amount                 $ 1,000,000,000
Total repurchase amount     $ 576,900,000