DEBT (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Long-Term Debt
Principal value of long-term debt obligations	$ 1,500.0		$ 1,500.0		$ 1,500.0
Unamortized basis adjustment for terminated interest rate swaps	21.3		21.3		26.0
Unamortized bond discount	(2.4)		(2.4)		(2.8)
Long-term debt	1,518.9		1,518.9		1,523.2
Long-term debt - fair value	1,617.5		1,617.5
Interest expense	14.8	18.8	30.8	35.0
Interest income	(2.4)	(1.2)	(4.2)	(2.9)
Interest expense-net	12.4	17.6	26.6	32.1
3.50% Notes due 2014
Long-Term Debt
Principal value of long-term debt obligations	500.0		500.0		500.0
Stated rate (as a percent)	3.50%		3.50%		3.50%
4.90% Notes due 2019
Long-Term Debt
Principal value of long-term debt obligations	700.0		700.0		700.0
Stated rate (as a percent)	4.90%		4.90%		4.90%
5.90% Notes due 2039
Long-Term Debt
Principal value of long-term debt obligations	$ 300.0		$ 300.0		$ 300.0
Stated rate (as a percent)	5.90%		5.90%		5.90%