SHORT-TERM DEBT AND LINES OF CREDIT SHORT-TERM DEBT AND LINES OF CREDIT - SHORT-TERM BORROWINGS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Short-term borrowings
Short-term borrowings outstanding	$ 321.9		$ 326.0
Commercial paper
Short-term borrowings
Short-term borrowings outstanding	321.9		326.0
Average interest rate (as a percent)	0.23%		0.22%
Average amount of short-term borrowings outstanding	$ 247.1	$ 400.7