SHAREHOLDER'S EQUITY, STOCK REPURCHASE (DETAILS) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Feb. 29, 2012 February 2012 Stock Repurchase Program [Member]	Jun. 30, 2012 February 2012 Stock Repurchase Program [Member]	Jun. 30, 2011 February 2012 Stock Repurchase Program [Member]	Jun. 30, 2012 February 2012 Stock Repurchase Program [Member]	Jun. 30, 2011 February 2012 Stock Repurchase Program [Member]	Jun. 30, 2011 June 2011 Stock Repurchase Program [Member]	Jun. 30, 2012 June 2011 Stock Repurchase Program [Member]	Jun. 30, 2011 June 2011 Stock Repurchase Program [Member]	Jun. 30, 2012 June 2011 Stock Repurchase Program [Member]	Jun. 30, 2011 June 2011 Stock Repurchase Program [Member]	Jun. 30, 2010 June 2010 Stock Repurchase Program [Member]	Jun. 30, 2012 June 2010 Stock Repurchase Program [Member]	Jun. 30, 2011 June 2010 Stock Repurchase Program [Member]	Jun. 30, 2012 June 2010 Stock Repurchase Program [Member]	Jun. 30, 2011 June 2010 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount under share repurchase program					$ 50					$ 50					$ 50
Share repurchase activity (in shares)	506,000	218,600	755,340	1,086,600		506,000	0	709,000	0		0	63,000	46,340	63,000		0	155,600	0	1,023,600
Share repurchase activity	$ 17.5	$ 7.0	$ 26.3	$ 33.3		$ 17.5	$ 0	$ 24.6	$ 0		$ 0	$ 2.1	$ 1.7	$ 2.1		$ 0	$ 4.9	$ 0	$ 31.2
Common stock held in treasury retired			4,829,834