Cover Page - shares	3 Months Ended
	Mar. 31, 2023	May 02, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-33824
Entity Registrant Name	Kennedy-Wilson Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-0508760
Entity Address, Address Line One	151 S El Camino Drive
Entity Address, City or Town	Beverly Hills
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90212
City Area Code	310
Local Phone Number	887-6400
Title of 12(b) Security	Common stock, $.0001 par value
Trading Symbol	KW
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		139,390,837
Entity Central Index Key	0001408100
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false