DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Offsetting of Financial Assets and Derivative Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivatives
Gross Amount of Recognized Assets	$ 128.1	$ 163.6
Gross Amount Offset in the Statement of Financial Position	0.0	0.0
Net Amount of Assets Presented in the Statement of Financial Position	128.1	163.6
Gross Amount Not Offset in the Statement of Financial Position	(23.2)	(41.5)	[1]
Net Amount	$ 104.9	$ 122.1

[1] Includes $12.6 million of cash collateral held at December 31, 2015.