INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (DETAILS) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Investment Holdings [Line Items]
Total amortized cost	$ 792.5
Total fair value	789.3
Amortized Cost [Member]
Investment Holdings [Line Items]
Due in one year or less	3.6
Due after one year through five years	376.8
Due after five years through ten years	412.1
Total amortized cost	792.5
Estimated Fair Value [Member]
Investment Holdings [Line Items]
Due in one year or less	3.6
Due after one year through five years	375.1
Due after five years through ten years	410.6
Total fair value	$ 789.3