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	$ 63.0		$ 25.6
Commercial paper
Short-term borrowings
Short-term borrowings outstanding	63.0		25.6
Average interest rate (as a percent)	0.18%		0.14%
Average amount of short-term borrowings outstanding	$ 25.7	$ 88.4