Unconsolidated Investments (Schedule of New Joint Venture Investments) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014 Property
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	$ 78.2
No. of Properties	17
Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	4.0
No. of Properties	1
Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	57.2
No. of Properties	14
Residential [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	17.0
No. of Properties	2
Western United States
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	21.0
No. of Properties	3
Western United States | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	4.0
No. of Properties	1
Western United States | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	0
No. of Properties	0
Western United States | Residential [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	17.0
No. of Properties	2
United Kingdom
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	57.2	[1]
No. of Properties	14	[1]
United Kingdom | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	0	[1]
No. of Properties	0	[1]
United Kingdom | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	57.2	[1]
No. of Properties	14	[1]
United Kingdom | Residential [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments, new investments	$ 0	[1]
No. of Properties	0	[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.