SHORT-TERM DEBT AND LINES OF CREDIT OUTSTANDING (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Short-term borrowings
Short-term borrowings outstanding	$ 176.8	$ 182.8
Commercial paper
Short-term borrowings
Short-term borrowings outstanding	$ 176.8	$ 182.8
Average interest rate on amounts outstanding (as a percent)	1.01%	0.66%
Average amount of short-term borrowings outstanding during the year	$ 145.8
Commercial Paper Weighted Average Interest Rate	0.62%