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	Dec. 31, 2017	Dec. 31, 2016
Portfolio-Related Secured Borrowings [Member]
Notional Disclosures [Abstract]
Accrued interest payable	$ 7.7	$ 7.4