DEBT (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Long-Term Debt
Principal value of long-term debt obligations	$ 1,500.0		$ 1,500.0
Unamortized basis adjustment for terminated interest rate swaps	23.7		26.0
Unamortized bond discount	(2.6)		(2.8)
Long-term debt	1,521.1		1,523.2
Long-term debt - fair value	1,685.0
Interest expense	16.0	16.2
Interest income	(1.8)	(1.7)
Interest expense-net	14.2	14.5
3.50% Notes due 2014
Long-Term Debt
Stated rate (as a percent)	3.50%		3.50%
Principal value of long-term debt obligations	500.0		500.0
4.90% Notes due 2019
Long-Term Debt
Stated rate (as a percent)	4.90%		4.90%
Principal value of long-term debt obligations	700.0		700.0
5.90% Notes due 2039
Long-Term Debt
Stated rate (as a percent)	5.90%		5.90%
Principal value of long-term debt obligations	$ 300.0		$ 300.0