GUARANTOR AND NON-GUARANTOR FINANCIAL STATEMENTS (Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Provision for (benefit from) deferred income taxes	$ 2.7		$ (0.5)		$ (4.7)
Net cash provided by operating activities	31.3		16.7		3.4
Cash flows from investing activities:
Additions to notes receivable	(51.0)		(167.9)		(6.1)
Settlements of notes receivable	39.4		7.1		3.6
Additions to notes receivable—related party	(10.7)		(17.1)		(35.3)
Settlements of notes receivable—related party	6.6		9.1		4.9
Sale of participation interests	3.8
Sale of participation interests—related party	2.8
Capitalized development costs	(1.4)		0		0
Non refundable escrow deposits	(4.0)		0		0
Net proceeds from sale of real estate	10.1		18.7		7.1
Purchases of and additions to real estate	(168.5)		(119.0)		(2.7)
Short-term investments	10.0		(10.0)
Investment in marketable securities	(3.7)		0		(32.8)
Proceeds from sale of marketable securities			34.1
Investing distributions from joint ventures	81.5		38.7		23.3
Contributions to joint ventures	(322.7)		(178.6)		(105.4)
Investing distributions from loan pool participation	93.9		58.1		66.4
Contributions to loan pool participation	(34.9)		(72.9)		(130.5)
(Investments in) distributions from consolidated subsidiaries, net
Net cash used in investing activities	(348.8)		(399.7)		(207.5)
Cash flow from financing activities:
Borrowings under senior notes payable			160.3		249.3
Repayment of notes payable					(24.8)
Borrowings under lines of credit	125.0		85.8		74.0
Repayment of lines of credit	(125.0)		(85.8)		(101.8)
Borrowings under mortgage loans payable	112.5		157.7		17.1
Repayment of mortgage loans payable	(1.7)				(37.6)
Debt issue costs	(2.2)		(7.3)		(7.7)
Issuance of common stock	275.9		106.2		123.1
Issuance of preferred stock					123.1
Repurchase of common stock	(3.8)				(0.5)
Repurchase of warrants	(1.4)		(1.6)		(6.1)
Exercise of warrants	15.4		0		0
Dividends paid	(24.1)	[1]	(21.9)	[1]	(11.7)
Acquisition of noncontrolling interests			(0.5)
Contributions from noncontrolling interests	1.4		0.4		4.4
Distributions to noncontrolling interests	(0.6)		(4.9)		(5.1)
Intercompany receivables, net
Net cash provided by financing activities	371.4		388.4		272.6
Effect of currency exchange rate changes on cash and cash equivalents	3.4		(0.4)		0.5
Net change in cash and cash equivalents	57.3		5.0		69.0
Cash and cash equivalents, beginning of year	120.9		115.9		46.9
Cash and cash equivalents, end of year	178.2		120.9		115.9		46.9
Percentage ownership in guarantor subsidiaries less than 100% prior to 2011 and 2010 and 100% in 2011 and 2010					100.00%		100.00%
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0.6		(0.6)
Cash flows from investing activities:
Additions to notes receivable
Settlements of notes receivable
Additions to notes receivable—related party
Settlements of notes receivable—related party
Sale of participation interests	0
Sale of participation interests—related party	0
Capitalized development costs	0
Non refundable escrow deposits	0
Net proceeds from sale of real estate
Purchases of and additions to real estate
Short-term investments			0
Investment in marketable securities					0
Proceeds from sale of marketable securities
Investing distributions from joint ventures
Contributions to joint ventures
Investing distributions from loan pool participation					0
Contributions to loan pool participation
(Investments in) distributions from consolidated subsidiaries, net	(262.6)		(82.1)		(104.8)
Net cash used in investing activities	(262.6)		(82.1)		(104.8)
Cash flow from financing activities:
Borrowings under senior notes payable
Repayment of notes payable
Borrowings under lines of credit
Repayment of lines of credit
Borrowings under mortgage loans payable
Repayment of mortgage loans payable
Debt issue costs
Issuance of common stock	275.9		106.2
Issuance of preferred stock					123.1
Repurchase of common stock	(3.8)				(0.5)
Repurchase of warrants	(1.4)		(1.6)		(6.1)
Exercise of warrants	15.4
Dividends paid	(24.1)		(21.9)		(11.7)
Acquisition of noncontrolling interests			0
Contributions from noncontrolling interests
Distributions to noncontrolling interests
Intercompany receivables, net
Net cash provided by financing activities	262.0		82.7		104.8
Effect of currency exchange rate changes on cash and cash equivalents
Net change in cash and cash equivalents
Cash and cash equivalents, beginning of year
Cash and cash equivalents, end of year
Kennedy-Wilson, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(67.0)		(59.1)		(32.0)
Cash flows from investing activities:
Additions to notes receivable	(31.4)
Settlements of notes receivable	1.2		0.2
Additions to notes receivable—related party	(8.2)		(17.1)		(35.3)
Settlements of notes receivable—related party	6.6		9.1		4.9
Sale of participation interests	0
Sale of participation interests—related party	0
Capitalized development costs	(1.4)
Non refundable escrow deposits	(4.0)
Net proceeds from sale of real estate			18.7
Purchases of and additions to real estate
Short-term investments	10.0		(10.0)
Investment in marketable securities					(32.8)
Proceeds from sale of marketable securities			34.1
Investing distributions from joint ventures	0.4
Contributions to joint ventures	(2.3)		(1.2)		(2.0)
Investing distributions from loan pool participation					0
Contributions to loan pool participation
(Investments in) distributions from consolidated subsidiaries, net	104.4		(116.0)		(44.0)
Net cash used in investing activities	75.3		(82.2)		(109.2)
Cash flow from financing activities:
Borrowings under senior notes payable			160.3		249.3
Repayment of notes payable					(20.5)
Borrowings under lines of credit	125.0		85.8		74.0
Repayment of lines of credit	(125.0)		(85.8)		(101.8)
Borrowings under mortgage loans payable
Repayment of mortgage loans payable
Debt issue costs	(1.3)		(7.3)		(7.2)
Issuance of common stock
Issuance of preferred stock
Repurchase of common stock
Repurchase of warrants
Exercise of warrants	0
Dividends paid
Acquisition of noncontrolling interests			0
Contributions from noncontrolling interests
Distributions to noncontrolling interests
Intercompany receivables, net	(23.5)
Net cash provided by financing activities	(24.8)		110.1		193.8
Effect of currency exchange rate changes on cash and cash equivalents	0.2		(0.1)		0.4
Net change in cash and cash equivalents	(16.3)		(31.3)		53.0
Cash and cash equivalents, beginning of year	64.5		95.8		42.8
Cash and cash equivalents, end of year	48.2		64.5		95.8
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	47.6		82.2		11.1	[2]
Cash flows from investing activities:
Additions to notes receivable	(19.6)		(167.9)		(6.1)	[2]
Settlements of notes receivable	38.1		6.8		3.6	[2]
Additions to notes receivable—related party	(2.5)					[2]
Settlements of notes receivable—related party						[2]
Sale of participation interests	3.8
Sale of participation interests—related party	2.8
Capitalized development costs	0
Non refundable escrow deposits	0
Net proceeds from sale of real estate	9.8				7.1	[2]
Purchases of and additions to real estate	(62.4)		(33.8)		(2.6)	[2]
Short-term investments			0
Investment in marketable securities	(3.7)
Proceeds from sale of marketable securities
Investing distributions from joint ventures	73.9		38.0		17.9	[2]
Contributions to joint ventures	(195.3)		(177.3)		(100.8)	[2]
Investing distributions from loan pool participation	93.9		58.1		66.4
Contributions to loan pool participation	(34.9)		(72.9)		(130.5)	[2]
(Investments in) distributions from consolidated subsidiaries, net	43.8		194.6		146.8	[2]
Net cash used in investing activities	(52.3)		(154.4)		1.8	[2]
Cash flow from financing activities:
Borrowings under senior notes payable						[2]
Repayment of notes payable						[2]
Borrowings under lines of credit						[2]
Repayment of lines of credit						[2]
Borrowings under mortgage loans payable	41.1		108.2		5.0	[2]
Repayment of mortgage loans payable					(15.6)	[2]
Debt issue costs	(0.3)					[2]
Issuance of common stock
Issuance of preferred stock						[2]
Repurchase of common stock						[2]
Repurchase of warrants						[2]
Exercise of warrants	0
Dividends paid						[2]
Acquisition of noncontrolling interests			0
Contributions from noncontrolling interests					1.6	[2]
Distributions to noncontrolling interests					(4.8)	[2]
Intercompany receivables, net
Net cash provided by financing activities	40.8		108.2		(13.8)	[2]
Effect of currency exchange rate changes on cash and cash equivalents	2.6				0.1	[2]
Net change in cash and cash equivalents	38.7		36.0		(0.8)	[2]
Cash and cash equivalents, beginning of year	38.5		2.5	[2]	3.3	[2]
Cash and cash equivalents, end of year	77.2		38.5		2.5	[2]
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	50.1		(5.8)		24.3
Cash flows from investing activities:
Additions to notes receivable
Settlements of notes receivable	0.1		0.1
Additions to notes receivable—related party
Settlements of notes receivable—related party
Sale of participation interests	0
Sale of participation interests—related party	0
Capitalized development costs	0
Non refundable escrow deposits	0
Net proceeds from sale of real estate	0.3
Purchases of and additions to real estate	(106.1)		(85.2)		(0.1)
Short-term investments			0
Investment in marketable securities
Proceeds from sale of marketable securities
Investing distributions from joint ventures	7.2		0.7		5.4
Contributions to joint ventures	(125.1)		(0.1)		(2.6)
Investing distributions from loan pool participation
Contributions to loan pool participation
(Investments in) distributions from consolidated subsidiaries, net	114.4		3.5		2.0
Net cash used in investing activities	(109.2)		(81.0)		4.7
Cash flow from financing activities:
Borrowings under senior notes payable
Repayment of notes payable					(4.3)
Borrowings under lines of credit
Repayment of lines of credit
Borrowings under mortgage loans payable	71.4		49.5		12.1
Repayment of mortgage loans payable	(1.7)				(22.0)
Debt issue costs	(0.6)				(0.5)
Issuance of common stock
Issuance of preferred stock
Repurchase of common stock
Repurchase of warrants
Exercise of warrants	0
Dividends paid
Acquisition of noncontrolling interests			(0.5)
Contributions from noncontrolling interests	1.4		0.4		2.8
Distributions to noncontrolling interests	(0.6)		(4.9)		(0.3)
Intercompany receivables, net	23.5
Net cash provided by financing activities	93.4		87.4		(12.2)
Effect of currency exchange rate changes on cash and cash equivalents	0.6		(0.3)
Net change in cash and cash equivalents	34.9		0.3		16.8
Cash and cash equivalents, beginning of year	17.9		17.6		0.8
Cash and cash equivalents, end of year	$ 52.8		$ 17.9		$ 17.6

[1] The difference between declared and paid is the amount accrued on the consolidated balance sheets.

[2] Included in the guarantor subsidiaries column above are data for certain subsidiaries that were less than 100% owned for the year ended December 31, 2011 by Kennedy-Wilson at the time the notes were originally issued. Such guarantor subsidiaries were restructured prior to registering the notes such that Kennedy-Wilson now owns 100% of all the guarantor subsidiaries. As a result, in accordance with Rule 3-10(d) of Regulation S-X promulgated by the SEC, no separate financial statements are required for such guarantor subsidiaries.