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
Mar. 31, 2018
Dec. 31, 2017
Portfolio-Related Secured Borrowings [Member]    
Notional Disclosures [Abstract]    
Accrued interest payable $ 9.5 $ 7.7