BUSINESS ACQUISITIONS Business Acquisitions in the Aggregate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Jul. 27, 2016	Feb. 19, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Total acquisition consideration (cash and non-cash)						$ 249.1
Other Long-term Debt	$ 715.0		$ 715.0		$ 715.0
Revenues	2,414.7	$ 2,317.3	7,213.4	$ 6,379.6
Payments to Acquire Businesses, Net of Cash Acquired			396.8	3,692.7
Goodwill, Acquired During Period			292.8		3,194.6
Goodwill	$ 6,389.0		6,389.0		$ 6,166.3			$ 3,099.4
Covance [Member]
Business Acquisition [Line Items]
Make-whole payment				$ 37.4
Total acquisition consideration (cash and non-cash)							$ 6,150.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt							$ 250.0
Excluding Covance [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			147.7
Finite-lived Intangible Assets Acquired			212.4
Goodwill, Acquired During Period			$ 292.2