INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details) $ in Millions	Jun. 30, 2016 USD ($)
Investment Holdings [Line Items]
Total amortized cost	$ 1,828.8
Total fair value	1,807.8
Amortized cost [Member]
Investment Holdings [Line Items]
Due in one year or less	4.8
Due after one year through five years	1,011.4
Due after five years through ten years	812.6
Total amortized cost	1,828.8
Estimated fair value [Member]
Investment Holdings [Line Items]
Due in one year or less	4.8
Due after one year through five years	996.2
Due after five years through ten years	806.8
Total fair value	$ 1,807.8