VARIABLE INTEREST ENTITIES BORROWINGS (Securitization) (Details) - RSO [Member] $ in Millions	Sep. 30, 2015 USD ($)
RREF CDO 2006-1 Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	$ 180.4
RREF CDO 2007-1 Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	216.6
RCC CRE Notes 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	133.6
RCC CRE Notes 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	0.0
RCC CRE Notes 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	0.0
Apidos Cinco CDO Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	169.7
Moselle CLO S.A. Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	167.2
Moselle CLO S.A. Securitized Borrowings [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	5.0
RCC CRE Notes 2015-CRE4 [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	0.0
Apidos CDO III Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Cumulative Amount Repaid	$ 262.5