SHORT-TERM DEBT AND LINES OF CREDIT (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 30, 2013
Short-term borrowings
Short-term borrowings outstanding	$ 326.0	$ 482.4
Commercial paper
Short-term borrowings
Short-term borrowings outstanding	326.0	482.4	303.3
Average interest rate (as a percent)	0.22%	0.40%	0.31%
Average amount of short-term borrowings outstanding	378.4	326.3	134.9
Short-term notes payable
Short-term borrowings
Short-term borrowings outstanding				200.0
Average amount of short-term borrowings outstanding	$ 130.4	$ 0	$ 3.6