Consolidated Statement of Equity (Unaudited) - 6 months ended Jun. 30, 2016 - 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, 2015		32,550	114,533,581
Balance beginning of period at Dec. 31, 2015	$ 2,865.1	$ 0.0	$ 0.0	$ 1,225.7	$ (44.2)	$ (47.7)	$ 1,731.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares forfeited (in shares)			(8,000)
Restricted stock grants (RSG) (in shares)			32,500
Shares retired due to RSG vesting (in shares)			634,692
Shares retired due to RSG vesting	14.6			14.6	0.0
Shares retired due to RSG Vesting (in shares)			(1,421,252)
Shares retired due to RSG vesting	(28.0)			(25.2)	(2.8)
Stock based compensation	32.2			32.2
Other comprehensive income (loss):
Unrealized foreign currency translation loss, net of tax	(57.5)					(5.9)	(51.6)
Unrealized foreign currency derivative contract loss, net of tax	(89.8)					(3.1)	(86.7)
Unrealized gain on marketable securities	0.1					0.1
Preferred stock dividends	(1.1)				(1.1)
Common stock dividends	(32.0)				(32.0)
Net (loss) income	18.2				(8.0)		26.2
Acquisition of Kennedy Wilson Europe (KWE) shares from noncontrolling interest holders	(67.9)						(67.9)
Acquisition of noncontrolling interests from consolidated entity	0.0			(1.5)			1.5
Contributions from noncontrolling interests, excluding KWE	12.9						12.9
Distributions to noncontrolling interests	(73.5)						(73.5)
Ending balance outstanding (in shares) at Jun. 30, 2016		32,550	112,502,137
Balance end of period at Jun. 30, 2016	$ 2,564.1	$ 0.0	$ 0.0	$ 1,216.6	$ (88.1)	$ (56.6)	$ 1,492.2