BUSINESS ACQUISITIONS (Details) - USD ($) $ / shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jul. 31, 2017	Dec. 31, 2015
Business Combination Purchase Price Allocation [Line Items]
Proforma consolidated net revenue		$ 2,747.3		$ 8,086.6
Revenues	$ 2,831.3	2,621.4	$ 8,545.9	7,563.3
Operating Income (Loss)	343.4	326.7	1,018.0	974.6
Other Long-term Debt	0.0		0.0		$ 57.8
Other Significant Noncash Transaction, Value of Consideration Given			67.4
Net Income (Loss) Attributable to Parent	318.8	171.5	725.8	539.3
Goodwill, Acquired During Period			49.5		1,009.8
Goodwill	$ 7,362.7		7,362.7		$ 7,400.9		$ 6,424.4
Cash payments for laboratory-related assets			257.6	216.8
Payments to Acquire Businesses, Net of Cash Acquired			$ 79.1	1,799.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents						$ 30.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables						103.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets						32.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets						57.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						12.1
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net						735.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets						1,612.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable						45.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities						19.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue						124.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent						196.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other						2.4
Business Combination, Separately Recognized Transactions, Liabilities Recognized						387.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net						1,224.5
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax		313.2		975.0
Business Acquisition, Pro Forma Net Income (Loss)		$ 158.1		$ 521.2
Business Acquisition, Pro Forma Earnings Per Share, Basic		$ 0		$ 0
Proforma consolidated diluted earnings per share		$ 0		$ 0
Chiltern [Member]
Business Combination Purchase Price Allocation [Line Items]
Cash paid for acquisition						1,224.5
Customer Relationships [Member]
Business Combination Purchase Price Allocation [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						602.0
Customer Relationships [Member] | Chiltern [Member]
Business Combination Purchase Price Allocation [Line Items]
Acquired Finite-lived Intangible Assets, Useful Life	21 years
Trademarks and Trade Names [Member]
Business Combination Purchase Price Allocation [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						10.6
Trademarks and Trade Names [Member] | Chiltern [Member]
Business Combination Purchase Price Allocation [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years
Software and Software Development Costs [Member] | Chiltern [Member]
Business Combination Purchase Price Allocation [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years
Technology-Based Intangible Assets [Member]
Business Combination Purchase Price Allocation [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						$ 26.0