DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Offsetting of Financial Assets and Derivative Assets) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Derivatives
Gross Amount of Recognized Assets		$ 193.4	$ 279.1
Gross Amount Offset in the Statement of Financial Position
Net Amount of Assets Presented in the Statement of Financial Position		$ 193.4	$ 279.1
Gross Amount Not Offset in the Statement of Financial Position	[1]	(59.9)	(91.8)
Net Amount		$ 133.5	$ 187.3

[1] Includes $16.2 million and $28.4 million of cash collateral held at September 30, 2015 and December 31, 2014, respectively.