KW UNSECURED DEBT - Schedule of Unsecured Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
KW unsecured debt
Debt Instrument [Line Items]
Debt, net of discount (premium)	$ 2,085.5	$ 1,878.9
Unamortized loan fees	(22.9)	(26.6)
Total debt	2,062.6	1,852.3
Unamortized discount	3.5	3.9
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Debt, net of discount (premium)	282.0	75.0
Senior Notes
Debt Instrument [Line Items]
Debt, net of discount (premium)	$ 1,803.5	$ 1,803.9