FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance - January 1	$ 58.9	$ 62.4
Total gains
Included in earnings	187.8	152.3
Settlements	(183.5)	(155.8)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance - December 31	63.2	58.9
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) on assets still held at the reporting date	187.8	152.3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance - January 1	(10.3)	(11.3)
Total gains
Included in earnings	(11.8)	(10.3)
Settlements	10.3	11.3
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance - September 30	(11.8)	(10.3)
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) on liabilities still held at the reporting date	$ (11.8)	$ (10.3)