FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Recapture rate, term	1 year
Assets measured at fair value on a nonrecurring basis	$ 292.4	$ 666.6
Broker price discount	20.00%
Residential Mortgage Loan [Member]
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 253.0
Real Estate Acquired in Satisfaction of Debt [Member]
Schedule of Equity Method Investments [Line Items]
Assets measured at fair value on a nonrecurring basis	39.4
Reduction of value of assets due to fair value adjustment	4.5	2.4
Loans Held-for-sale [Member]
Schedule of Equity Method Investments [Line Items]
Reduction of value of assets due to fair value adjustment	$ 14.1	$ 4.9
Maturity Greater than 30 Days [Member]
Schedule of Equity Method Investments [Line Items]
Days delinquent	30 days
Excess MSRs Investees [Member] | MSRs [Member]
Schedule of Equity Method Investments [Line Items]
Weighted average discount rate, used to value investments in excess MSRs	9.80%	9.60%