DEBT (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended		1 Months Ended		12 Months Ended
	Dec. 31, 2012 1.25% Convertible Senior Notes Due March 2015 [Member]	Dec. 31, 2011 1.25% Convertible Senior Notes Due March 2015 [Member]	Mar. 31, 2010 1.25% Convertible Senior Notes Due March 2015 [Member] Minimum [Member]	Mar. 31, 2010 1.25% Convertible Senior Notes Due March 2015 [Member] Maximum [Member]	Dec. 31, 2011 Convertible Debt Converted Debt [Member]	Dec. 31, 2010 Convertible Debt Converted Debt [Member]
Debt Instrument
Reclassification Adjustment for Convertible Debt in Mezzanine	$ 54.7	$ 77.4
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares			0	132.7
Cash repayment of principal amount of convertible debt					0.2	195.6
Shares issued in satisfaction of conversion value in excess of principal amount (in shares)					4,869	3,457,828
Cash payment in satisfaction of conversion value in excess of principal amount						99.8
Unamortized debt issuance costs written off to interest expense related to debt conversions						$ 1.4