SHORT-TERM DEBT AND LINES OF CREDIT - SHORT-TERM BORROWINGS (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Short-term borrowings
Short-term borrowings outstanding	$ 314.4		$ 317.6
Commercial paper
Short-term borrowings
Short-term borrowings outstanding	$ 314.4		$ 317.6
Average interest rate (as a percent)	0.37%		0.36%
Average amount of commercial paper borrowings outstanding	$ 165.3	$ 215.6