STOCK-BASED EMPLOYEE COMPENSATION STOCK-BASED EMPLOYEE COMPENSATION (Details Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				3 Months Ended		12 Months Ended		12 Months Ended
	Mar. 31, 2012 Years	Mar. 31, 2011	Mar. 31, 2012 Restricted Stock Units, Performance Share Units and Restricted Stock Awards [Member] Years	Dec. 31, 2011 Restricted Stock Units, Performance Share Units and Restricted Stock Awards [Member]	Mar. 31, 2012 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2012 Performance Share Units 2012 Grants [Member]	Dec. 31, 2011 Performance Share Units 2011 Grants [Member]	Mar. 31, 2012 Performance Share Units 2011 Grants [Member]	Dec. 31, 2010 Performance Share Units 2010 Grants [Member]	Mar. 31, 2012 Performance Share Units 2010 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 16.5	$ 14.0
Exercised (in shares)	(55,716)
Exercised (in dollars per share)	$ 18.76
Outstanding at March 31, 2012 (in shares)	141,522
Outstanding at March 31, 2012 (in dollars per share)	$ 21.48
Outstanding at March 31 (in years)	2.2
Total future compensation cost related to unvested Share-Based Awards			132.0
Total future compensation cost related to unvested Share-Based Awards, expected period of recognition (in years)			2.2
Granted (in shares)			90,192		29,827	60,365	77,144		110,430
Vesting period (in years)					3 years
Aggregate grant-date fair value of restricted shares, performance share units and restricted stock units granted during the period					19.3	39.0
Granted (in dollars per share)					$ 645.86	$ 645.86	$ 464.79		$ 235.34
Grant date fair value							$ 35.9		$ 26.0
Unvested at March 31, 2012 (in shares)			546,965	799,980				76,122		85,796
Estimated number of probable shares to be issued (in shares)						60,365		152,832		203,349
Maximum shares that could be issued (in shares)						120,730		162,464		203,349
Minimum shares that could be issued (in shares)						38,611