BUSINESS ACQUISITIONS (Details) - USD ($) $ / shares in Thousands, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jul. 31, 2017	Dec. 31, 2015
Business Combination Purchase Price Allocation [Line Items]
Proforma consolidated net revenue		$ 2,611.3
Revenues	$ 2,848.3	2,413.7
Operating Income (Loss)	305.4	318.1
Other Long-term Debt	72.0		$ 57.8
Other Significant Noncash Transaction, Value of Consideration Given	28.4
Net Income (Loss) Attributable to Parent	173.2	183.0
Goodwill, Acquired During Period	6.8	1,009.8
Goodwill	7,615.5		7,571.4		$ 6,424.4
Cash payments for laboratory-related assets	72.5	72.2
Payments to Acquire Businesses, Net of Cash Acquired	$ 0.0	151.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				$ 30.7
Purchase price adjustment			0.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables				105.6
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				760.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				1,638.9
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				23.0
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				220.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other				1.1
Business Combination, Separately Recognized Transactions, Liabilities Recognized				414.4
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		340.6
Business Acquisition, Pro Forma Net Income (Loss)		$ 190.6
Business Acquisition, Pro Forma Earnings Per Share, Basic		$ 0
Proforma consolidated diluted earnings per share		$ 0
Chiltern [Member]
Business Combination Purchase Price Allocation [Line Items]
Cash paid for acquisition				1,224.5
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				116.9
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				676.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				1,626.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable				18.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities				51.0
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				208.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other				1.1
Business Combination, Separately Recognized Transactions, Liabilities Recognized				402.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				1,224.5
Customer Relationships [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			(27.0)
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
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				629.0
Trademarks and Trade Names [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			(13.5)
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
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				24.1
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]
Purchase price adjustment			(21.0)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				26.0
Technology-Based Intangible Assets [Member] | Chiltern [Member]
Business Combination Purchase Price Allocation [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 47.0
Deferred Income Tax Charge [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			12.6
Cash and Cash Equivalents [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			0.0
Accounts Receivable [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			(11.3)
Other Current Assets [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			0.0
Prepaid Expenses and Other Current Assets [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			0.0
Property, Plant and Equipment [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			0.0
Goodwill [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			83.9
Assets [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			12.0
Accounts Payable [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			27.0
Accrued Liabilities [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			(27.6)
Deferred Revenue [Domain]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			0.0
Other Liabilities [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			0.0
Liability [Member]
Business Combination Purchase Price Allocation [Line Items]
Purchase price adjustment			$ 12.0