LONG-TERM DEBT (Details) (USD $) In Millions, unless otherwise specified			1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Feb. 28, 2013 3.95% Senior Notes	Mar. 31, 2013 4.80% Senior Notes
LONG-TERM DEBT
Stated interest rate (as a percent)			3.95%	4.80%
Current portion of long-term debt	$ 125.0	$ 147.0		$ 125.0
Principal balance repaid			$ 22.0