DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Offsetting of Financial Assets and Derivative Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Derivatives
Gross Amount of Recognized Assets		$ 180.8	$ 279.1
Gross Amount Offset in the Statement of Financial Position
Net Amount of Assets Presented in the Statement of Financial Position		$ 180.8	$ 279.1
Gross Amount Not Offset in the Statement of Financial Position	[1]	(56.1)	(91.8)
Net Amount		$ 124.7	$ 187.3

[1] Includes $11.5 million and $28.4 million of cash collateral held at June 30, 2015 and December 31, 2014, respectively.