Consolidated Statement of Equity (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Beginning balance outstanding (in shares) at Dec. 31, 2014		132,550	96,091,446
Balance beginning of period at Dec. 31, 2014	$ 3,043.9	$ 0.0	$ 0.0	$ 991.3	$ (62.0)	$ (28.2)	$ 2,142.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 8,625,000 shares, net (in shares)			8,625,000
Issuance of 8,625,000 shares, net	215.0			215.0
Shares forfeited (in shares)			(43,524)
RSG Grants (in shares)			61,400
Shares retired due to RSG Vesting (in shares)			(405,937)
Shares retired due to RSG Vesting	(11.5)			(11.5)
Conversion of preferred stock to common stock (in shares)		(100,000)	8,554,948
Stock based compensation	19.6			19.6
Other comprehensive income (loss):
Unrealized foreign currency translation loss, net of tax	(69.2)					(13.6)	(55.6)
Unrealized foreign currency derivative contract gain, net of tax	(2.3)					5.4	(7.7)
Preferred stock dividends	(3.1)				(3.1)
Common stock dividends	(39.5)				(39.5)
Net income	30.7				45.7		(15.0)
Acquisition of Kennedy Wilson Europe (KWE) shares from noncontrolling interest holders	(59.5)						(59.5)
Contributions from noncontrolling interests, excluding KWE	6.5						6.5
Distributions to noncontrolling interests	(205.8)						(205.8)
Ending balance outstanding (in shares) at Sep. 30, 2015		32,550	112,883,333
Balance end of period at Sep. 30, 2015	$ 2,924.8	$ 0.0	$ 0.0	$ 1,214.4	$ (58.9)	$ (36.4)	$ 1,805.7