INVESTMENTS IN JOINT VENTURES INVESTMENTS IN JOINT VENTURES (Cash Distributions by Investment Type and Location) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	$ 56.1	$ 40.4	$ 13.0
Investing distributions from joint ventures	81.5	38.7	23.3
Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	22.7
Investing distributions from joint ventures	52.8
Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	25.5
Investing distributions from joint ventures	25.3
Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	4.0
Investing distributions from joint ventures	0.3
Residential Real Estate [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	3.9
Investing distributions from joint ventures	3.1
Western United States [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	26.7
Investing distributions from joint ventures	31.0
Western United States [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	10.0
Investing distributions from joint ventures	7.1
Western United States [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	12.8
Investing distributions from joint ventures	20.9
Western United States [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
Western United States [Member] | Residential Real Estate [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	3.9
Investing distributions from joint ventures	3.0
Japan [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	9.4
Investing distributions from joint ventures	16.6
Japan [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	9.4
Investing distributions from joint ventures	16.6
Japan [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
Japan [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
Japan [Member] | Residential Real Estate [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
UNITED KINGDOM
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	13.2
Investing distributions from joint ventures	4.7
UNITED KINGDOM | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
UNITED KINGDOM | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	9.2
Investing distributions from joint ventures	4.4
UNITED KINGDOM | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	4.0
Investing distributions from joint ventures	0.3
UNITED KINGDOM | Residential Real Estate [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
IRELAND
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	6.4
Investing distributions from joint ventures	28.9
IRELAND | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	2.9
Investing distributions from joint ventures	28.9
IRELAND | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	3.5
Investing distributions from joint ventures	0
IRELAND | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
IRELAND | Residential Real Estate [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
Other Location [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0.4
Investing distributions from joint ventures	0.3
Other Location [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0.4
Investing distributions from joint ventures	0.2
Other Location [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
Other Location [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	0
Other Location [Member] | Residential Real Estate [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from joint ventures	0
Investing distributions from joint ventures	$ 0.1