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DERIVATIVES AND HEDGING DERIVATIVES AND HEDGING (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative, Net Liability Position, Aggregate Fair Value $ 7.6 $ 12.0
Collateral Already Posted, Aggregate Fair Value $ 29.3 $ 20.8