SHAREHOLDER'S EQUITY (DETAILS) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended							1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Pension Plans [Member]	Dec. 31, 2010 Pension Plans [Member]	Dec. 31, 2011 Postretirement medical liability [Member]	Dec. 31, 2010 Postretirement medical liability [Member]	Jun. 30, 2011 June 2011 Stock Repurchase Program [Member]	Dec. 31, 2011 June 2011 Stock Repurchase Program [Member]	Dec. 31, 2010 June 2011 Stock Repurchase Program [Member]	Dec. 31, 2009 June 2011 Stock Repurchase Program [Member]	Jun. 30, 2010 June 2010 Stock Repurchase Program [Member]	Dec. 31, 2011 June 2010 Stock Repurchase Program [Member]	Dec. 31, 2010 June 2010 Stock Repurchase Program [Member]	Dec. 31, 2009 June 2010 Stock Repurchase Program [Member]	Jun. 11, 2009 June 2009 Stock Repurchase Program [Member]	Dec. 31, 2011 June 2009 Stock Repurchase Program [Member]	Dec. 31, 2010 June 2009 Stock Repurchase Program [Member]	Dec. 31, 2009 June 2009 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount under share repurchase program	$ 50							$ 50				$ 50				$ 50
Share repurchase activity (in shares)	1,309,300	1,000,748	1,324,578						797,500	0	0		511,800	355,000	0		0	645,748	1,324,578
Share repurchase activity	79.5	45.1	23.8						48.3	0	0		31.2	18.8	0		0	26.3	23.8
Common stock held in treasury retired			7,900,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized loss (gain) on marketable securities considered available-for-sale	(5.7)	(8.0)
Related to pension plans				381.0	255.4	(1.0)	14.3
Related to interest rate derivatives	15.7	5.5
AOCL	$ 390.0	$ 267.2