BUSINESS ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ 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	Oct. 06, 2016	Jul. 27, 2016	Feb. 19, 2015	Jan. 30, 2015	Dec. 31, 2014
Business Combination Purchase Price Allocation [Line Items]
Revenues	$ 2,414.7	$ 2,317.3	$ 7,213.4	$ 6,379.6
Operating Income (Loss)	324.0	308.1	989.0	760.3
Other Long-term Debt	715.0		715.0		$ 715.0
Other Significant Noncash Transaction, Value of Consideration Given			67.4	88.9
Net Income (Loss) Attributable to Parent	179.5	$ 154.7	547.7	327.6
Total acquisition consideration (cash and non-cash)							$ 249.1
Goodwill, Acquired During Period			292.8		3,194.6
Senior Notes, Noncurrent									$ 2,900.0
Goodwill	$ 6,389.0		6,389.0		$ 6,166.3					$ 3,099.4
Cash payments for laboratory-related assets			204.6	170.7
Payments to Acquire Businesses, Net of Cash Acquired			$ 396.8	$ 3,692.7
Business Acquisition, Share Price							$ 2.40
Covance [Member]
Business Combination Purchase Price Allocation [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt								$ 250.0
Total acquisition consideration (cash and non-cash)								$ 6,150.7
Subsequent Event [Member]
Business Combination Purchase Price Allocation [Line Items]
Total acquisition consideration (cash and non-cash)						$ 115.0