EARNINGS PER SHARE (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Basic and diluted (loss) income per share attributable to Kennedy-Wilson Holdings, Inc. common shareholders:
Loss from continuing operations attributable to Kennedy-Wilson Holdings, Inc. common shareholders									$ (14.8)		$ (3.7)		$ (2.8)
Income (loss) from discontinued operations, net of income taxes, attributable to Kennedy-Wilson Holdings Inc. common shareholders									0.3		(0.2)		0.4
Net loss attributable to Kennedy-Wilson Holdings, Inc. common shareholders	$ (4.3)	$ (4.1)	$ (2.5)	$ (3.6)	$ 8.8	$ (6.2)	$ (3.2)	$ (3.3)	$ (14.5)		$ (3.9)		$ (2.4)
Income (loss) from continuing operations attributable to Kennedy-Wilson Holdings, Inc. common shareholders (in dollars per share)									$ (0.21)		$ (0.07)		$ (0.06)
Income from discontinued operations, net of income taxes, attributable to Kennedy-Wilson Holdings Inc. common shareholders (in dollars per share)									$ 0.00		$ 0.00		$ 0.01
Earning per share - basic and diluted (in dollars per share)									$ (0.21)	[1]	$ (0.07)	[1]	$ (0.05)	[1]
Weighted average shares outstanding for basic and diluted loss per share									71,159,919		55,285,833		42,415,770
Potentially Dilutive Securities (in shares)									13,494,478		19,339,021		20,609,591

[1] EPS amounts may not add due to rounding.