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BUSINESS ACQUISITIONS Business Acquisitions in the Aggregate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Proforma consolidated net revenue $ 2,696.8 $ 2,495.5 $ 7,874.8 $ 7,422.0    
Other Long-term Debt 515.0   515.0   $ 56.2  
Revenues 2,655.2 $ 2,414.7 7,645.1 7,213.4    
Payments to Acquire Businesses, Net of Cash Acquired     1,799.3 $ 396.8    
Goodwill, Acquired During Period     817.2   398.3  
Goodwill $ 7,325.1   7,325.1   $ 6,424.4 $ 6,202.1
Excluding Covance [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired     605.5      
Finite-lived Intangible Assets Acquired     $ 1,103.0