DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Effects of Interest Rate Swap on Other Comprehensive Income) (Details) (Interest rate contract [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Interest rate contract [Member]
Derivative Instruments, Gain (Loss)
Effective portion of derivative gain	$ 2.4	$ 8.2