RESTRUCTURING, INTEGRATION AND OTHER COSTS (Details 2) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Reserve, Settled with Cash	$ 25,860,000	$ 55,582,000	$ 56,443,000
Restructuring Reserve, Settled without Cash	(139,000)	4,665,000	51,919,000
Contract Termination, Facility Closure and Other Costs
Restructuring Reserve, Settled with Cash	22,572,000	15,381,000	8,755,000
Restructuring Reserve, Settled without Cash	(378,000)	4,913,000	2,437,000
Cost-rationalization and integration initiatives
Other restructuring,integration-related costs incurred	48,400,000
Severance costs	18,200,000
Other restructuring,integration-related costs paid	41,400,000
Operating lease obligation
Cost-rationalization and integration initiatives
Incremental charge for remaining operating lease obligation	$ 10,200,000