SHORT-TERM DEBT AND LINES OF CREDIT - SHORT-TERM BORROWINGS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Short-term borrowings
Short-term borrowings outstanding	$ 392.5		$ 326.0
Commercial paper
Short-term borrowings
Short-term borrowings outstanding	392.5		326.0
Average interest rate (as a percent)	0.24%		0.22%
Average amount of short-term borrowings outstanding	$ 287.8	$ 423.0