RESTRUCTURING AND OTHER SPECIAL CHARGES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring and Related Activities [Abstract]
Net restructuring charges	$ 44.6	$ 5.8	$ 13.5
Restructuring charges related to severance and other employee costs	27.4	8.0	10.5
Restructuring charges related to contractual obligations associated with leased facilities and other facility related costs	22.0	3.1	12.5
Reduction in prior facility related restructuring accruals		4.7	7.3
Special charge related to write-off of development costs incurred on abandoned systems		6.2
Reduction in total prior restructuring accruals	4.8	5.3	9.5
Impairment of Long-Lived Assets Held-for-use	18.9
Special charge related to write-off of certain assets and liabilities related to an investment	14.8
Write-off of an uncollectible receivable from a past installment sale	2.6
Reduction in prior employee severance benefits related restructuring accruals		$ 0.6	$ 2.2