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BUSINESS ACQUISITIONS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]        
Goodwill $ 2,911.6   $ 2,901.7 $ 2,681.8
Cash payments for laboratory-related assets $ 41.7 $ 34.2