BUSINESS ACQUISITIONS & DISPOSITIONS DISPOSITIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	$ 3.7	$ 0.0	$ 0.0
Cash and cash equivalents	426.8	316.6	433.6	$ 716.4
Accounts receivable	1,467.9	1,531.0
Unbilled Contracts Receivable	394.4	316.5
Supplies inventories	237.3	227.2
Prepaid expenses and other	309.0	308.8
Property, plant and equipment, net	1,784.7	1,706.6
Goodwill	7,360.3	7,400.9	$ 6,424.4
Intangible assets, net	3,911.1	4,166.1
Other assets, net	231.6	217.5
Accounts payable	634.6	573.9
Accrued expenses and other	870.0	793.3
Deferred Revenue, Current	356.4	380.8
Deferred income taxes and other tax liabilities	940.0	875.5
Other liabilities	334.0	376.0
Net assets held for sale		335.0
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	7.6	12.9
Nutritional Chemistry [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	670.0
Cash and cash equivalents		0.1
Accounts receivable		24.4
Unbilled Contracts Receivable		7.6
Supplies inventories		0.4
Prepaid expenses and other		1.2
Property, plant and equipment, net		42.3
Goodwill		170.5
Intangible assets, net		174.7
Other assets, net		0.3
Assets Held-for-sale, Not Part of Disposal Group		421.5
Accounts payable		2.4
Accrued expenses and other		15.2
Deferred Revenue, Current		2.6
Deferred income taxes and other tax liabilities		64.1
Other liabilities		2.2
Disposal Group, Including Discontinued Operation, Liabilities		$ 86.5
Covance Food Solutions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	258.3
UK forensic testing services business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	48.9
US forensic testing services business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	$ 24.5