DEBT (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended					1 Months Ended
	Dec. 31, 2010	Dec. 31, 2011 Converted Debt	Dec. 31, 2010 Converted Debt	Dec. 31, 2009 Converted Debt	Dec. 31, 2011 1.25% Convertible Senior Notes due March 2015	Mar. 31, 2010 1.25% Convertible Senior Notes due March 2015 Minimum [Member]	Mar. 31, 2010 1.25% Convertible Senior Notes due March 2015 Maximum [Member]
Debt Instrument
Reclassification Adjustment for Convertible Debt in Mezzanine					$ 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		$ 1.4	$ 1.2