MORTGAGE LOANS AND NOTES PAYABLE (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Note Receivable Due December 2016 Secured by Shopping Center with 107 Residential Units in the United Kingdom [Member] Notes Receivable [Member] Unit	Dec. 31, 2013 Note Receivable Due December 2016 Secured by Shopping Center with 107 Residential Units in the United Kingdom [Member] Notes Receivable [Member] Unit	Mar. 12, 2013 Note Receivable Due December 2016 Secured by Shopping Center with 107 Residential Units in the United Kingdom [Member] Notes Receivable [Member]	Dec. 31, 2013 Mortgage Loans and Notes Payable [Member]		Dec. 31, 2012 Mortgage Loans and Notes Payable [Member]		Dec. 31, 2013 Mortgage Loans Payable [Member]		Dec. 31, 2012 Mortgage Loans Payable [Member]		Dec. 31, 2013 Mortgage Loans Payable [Member] Mortgage Loans Secured by Multi-Family Properties [Member] Western U.S. [Member]		Dec. 31, 2012 Mortgage Loans Payable [Member] Mortgage Loans Secured by Multi-Family Properties [Member] Western U.S. [Member]		Dec. 31, 2013 Mortgage Loans Payable [Member] Mortgage Loans Secured by Notes Receivable [Member] UNITED KINGDOM		Dec. 31, 2012 Mortgage Loans Payable [Member] Mortgage Loans Secured by Notes Receivable [Member] UNITED KINGDOM		Dec. 31, 2013 Mortgage Loans Payable [Member] Mortgage Loans Secured by Commercial Buildings [Member] Western U.S. [Member]		Dec. 31, 2012 Mortgage Loans Payable [Member] Mortgage Loans Secured by Commercial Buildings [Member] Western U.S. [Member]		Dec. 31, 2013 Mortgage Loans Payable [Member] Mortgage Loans Secured by Commercial Buildings [Member] Japan [Member]		Dec. 31, 2012 Mortgage Loans Payable [Member] Mortgage Loans Secured by Commercial Buildings [Member] Japan [Member]		Dec. 31, 2013 Mortgage Loans Payable [Member] Mortgage Loans Secured by Residential Buildings [Member] Western U.S. [Member]		Dec. 31, 2012 Mortgage Loans Payable [Member] Mortgage Loans Secured by Residential Buildings [Member] Western U.S. [Member]		Dec. 31, 2013 Notes Payable [Member]		Dec. 31, 2012 Notes Payable [Member]
Debt Instrument [Line Items]
Long-term debt	$ 856.7	$ 686.2					$ 407.7	[1]	$ 236.5	[1]	$ 401.8	[1]	$ 230.6	[1]	$ 261.0	[1]	$ 97.6	[1]		[1]	$ 78.7	[1]	$ 110.4	[1]	$ 54.3	[1]	$ 2.4	[1]		[1]	$ 28.0	[1]		[1]	$ 5.9	[1]	$ 5.9	[1]
Debt unamortized premium	5.3	2.3					5.3
Number of units				107	107
Additions to notes receivable	51.0	167.9	6.1	43.6
Mortgage loans payable				$ 79.3			$ 402.4
Note receivable, ownership percentage sold					50.00%	50.00%

[1] The mortgage loan payable balances include unamortized debt premiums. Debt premiums represent the excess of the fair value of debt over the principal value of debt assumed in various acquisitions and are amortized into interest expense over the remaining term of the related debt in a manner that approximates the effective interest method. The unamortized loan premium as of December 31, 2013 and 2012 was $5.3 million and $2.3 million