UNCONSOLIDATED INVESTMENTS (Cash Distributions by Investment Type and Location) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	$ 88.8	$ 40.4
Investing distributions from unconsolidated investments	111.8	38.7
Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	11.1
Investing distributions from unconsolidated investments	3.2
Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	59.2
Investing distributions from unconsolidated investments	94.6
Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	7.7
Investing distributions from unconsolidated investments	7.9
Residential, Hotel and Other [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	10.8
Investing distributions from unconsolidated investments	6.1
Western United States [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	41.6
Investing distributions from unconsolidated investments	56.7
Western United States [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	9.4
Investing distributions from unconsolidated investments	3.2
Western United States [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	21.1
Investing distributions from unconsolidated investments	45.9
Western United States [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0.3
Investing distributions from unconsolidated investments	2.5
Western United States [Member] | Residential, Hotel and Other [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	10.8
Investing distributions from unconsolidated investments	5.1
Japan [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	1.7
Investing distributions from unconsolidated investments	0
Japan [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	1.7
Investing distributions from unconsolidated investments	0
Japan [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Japan [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Japan [Member] | Residential, Hotel and Other [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
United Kingdom [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	14.3
Investing distributions from unconsolidated investments	23.8
United Kingdom [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
United Kingdom [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	6.9
Investing distributions from unconsolidated investments	18.4
United Kingdom [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	7.4
Investing distributions from unconsolidated investments	5.4
United Kingdom [Member] | Residential, Hotel and Other [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Ireland [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	31.2
Investing distributions from unconsolidated investments	30.3
Ireland [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Ireland [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	31.2
Investing distributions from unconsolidated investments	30.3
Ireland [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Ireland [Member] | Residential, Hotel and Other [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Other Location [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	1.0
Other Location [Member] | Multifamily [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Other Location [Member] | Commercial [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments
Other Location [Member] | Loans [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	0
Other Location [Member] | Residential, Hotel and Other [Member]
Schedule of Equity Method Investments [Line Items]
Operating distributions from unconsolidated investments	0
Investing distributions from unconsolidated investments	$ 1.0