BUSINESS ACQUISITIONS (Details) - USD ($) $ / shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jul. 31, 2017	Dec. 31, 2015
Business Combination Purchase Price Allocation [Line Items]
Proforma consolidated net revenue	$ 2,728.1			$ 5,339.4
Revenues	2,866.3	$ 2,528.2	$ 5,714.6	4,941.9
Operating Income (Loss)	369.2	329.8	674.6	647.9
Other Long-term Debt	0.0		0.0		$ 57.8
Other Significant Noncash Transaction, Value of Consideration Given			43.0
Net Income (Loss) Attributable to Parent	233.8	$ 184.8	407.0	367.8
Goodwill, Acquired During Period			54.9		1,009.8
Goodwill	7,423.3		7,423.3		7,400.9		$ 6,424.4
Cash payments for laboratory-related assets			159.7	141.5
Payments to Acquire Businesses, Net of Cash Acquired			$ 79.1	568.0
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						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						762.5
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						23.4
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	321.5			662.2
Business Acquisition, Pro Forma Net Income (Loss)	$ 172.5			$ 363.2
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
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					(13.3)
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					(85.9)
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)