Unconsolidated Investments (Schedule of New Joint Venture Investments) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 Property
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	15
Payments to acquire equity method investments, new investments	$ 61.2
Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	1
Payments to acquire equity method investments, new investments	4.0
Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	14
Payments to acquire equity method investments, new investments	57.2
Western United States [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	1
Payments to acquire equity method investments, new investments	4.0
Western United States [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	1
Payments to acquire equity method investments, new investments	4.0
Western United States [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	0
Payments to acquire equity method investments, new investments	0
United Kingdom [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	14	[1]
Payments to acquire equity method investments, new investments	57.2	[1]
United Kingdom [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	0	[1]
Payments to acquire equity method investments, new investments	0	[1]
United Kingdom [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Number of Properties in New Joint Ventures	14	[1]
Payments to acquire equity method investments, new investments	$ 57.2	[1]

[1] Kennedy Wilson's contribution in a joint venture investment that was subsequently contributed into KWE as part of its initial investment. See note 1.