DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Offsetting of Financial Liabilities and Derivative Liabilities) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Derivatives
Gross Amount of Recognized Liabilities	[1]	$ (567.4)	$ (440.0)
Gross Amount Offset in the Statement of Financial Position
Net Amount of Liabilities Presented in the Statement of Financial Position		$ (567.4)	$ (440.0)
Gross Amount Not Offset in the Statement of Financial Position	[1]	59.9	91.8
Net Amount		$ (507.5)	$ (348.2)

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