BUSINESS ACQUISITIONS Business Acquisitions in the Aggregate (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 03, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill, Acquired During Period				$ 8.1
Business Acquisition, Pro Forma Revenue		$ 2,770.7	$ 2,941.0	5,596.7	$ 5,775.9
Gain (Loss) on Disposition of Assets						$ (12.2)
Revenues		2,768.8	2,881.7	5,592.6	5,672.9
Payments to Acquire Businesses, Net of Cash Acquired				11.3	703.7
Goodwill		7,422.7		7,422.7		$ 7,865.0
Business Acquisition, Pro Forma Net Income (Loss)		231.8	$ 194.3	(84.9)	382.6
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				6.0
Envigo [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 432.2	$ 376.6		376.6
Payments to Acquire Businesses, Net of Cash Acquired	$ 601.0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		11 years
Other acquirees [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period				8.1	53.8
Payments to Acquire Businesses, Net of Cash Acquired				17.3	117.7
Finite-lived Intangible Assets Acquired				$ 9.2	$ 90.7
Other acquirees [Member] | Minimum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					11 years
Other acquirees [Member] | Maximum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					15 years