USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Schedule of Offsetting of Financial Liabilities and Derivative Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Portfolio-Related Secured Borrowings [Member]
Notional Disclosures [Abstract]
Accrued interest payable	$ 12.4	$ 7.7