BUSINESS ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Feb. 19, 2015	Jan. 30, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 19, 2010
Business Acquisition [Line Items]
Other Significant Noncash Transaction, Value of Consideration Given				$ 1,762.5	$ 0.0
Net Income (Loss) Attributable to Parent	$ 152.8		$ 137.2	$ 322.6	391.6
Stock Issued During Period, Shares, Acquisitions				15,300,000
Senior Notes, Noncurrent							$ 2,900.0
Business Combination, Acquisition Related Costs				$ 166.0
Goodwill	6,068.6			6,068.6				$ 3,099.4	$ 3,022.8
Cash payments for laboratory-related assets				170.7	157.2
Payments to Acquire Businesses, Net of Cash Acquired				3,692.7	$ 65.3
Interest Expense [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs				52.6
Covance [Member]
Business Acquisition [Line Items]
Net Income (Loss) Attributable to Parent	27.8			7.4
Total acquisition consideration (cash and non-cash)						$ 6,150.7
Business Acquisition, Share Price						$ 75.76
Goodwill						$ 2,907.8
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned						0.2686
Covance, Inc. [Member] | General and Administrative Expense [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Items		1.1
Covance, Inc. [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Items		1.9
Excluding Covance [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				85.3
Finite-lived Intangible Assets Acquired				$ 19.6
Technology-Based Intangible Assets [Member] | Covance [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				10 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				28 years
Customer Relationships [Member] | Covance [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets						$ 306.9
Use Rights [Member] | Covance [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				8 years
Senior notes due 2045 [Member]
Business Acquisition [Line Items]
Senior Notes, Noncurrent							$ 900.0
Debt Instrument, Interest Rate, Stated Percentage							4.70%
Senior notes due 2020 [Member]
Business Acquisition [Line Items]
Senior Notes, Noncurrent	$ 500.0			$ 500.0			$ 500.0	$ 0.0
Debt Instrument, Interest Rate, Stated Percentage	4.625%			4.625%			2.625%			4.625%