BUSINESS ACQUISITIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 03, 2019	Dec. 19, 2014	Mar. 31, 2013
Business Acquisition [Line Items]
Adjustments to intangibles through amortization expense	$ 0.0	$ 400,000	$ 4,500,000
Long-term debt, less current portion	$ 5,419,000,000.0	5,789,800,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years 8 months 12 days
Finite-Lived Intangible Asset, Useful Life	15 years
Goodwill, net	$ 7,751,500,000	7,865,000,000.0	7,360,300,000
Payments to Acquire Businesses, Net of Cash Acquired	267,600,000	876,000,000.0	117,800,000
Finite-lived Intangible Assets Acquired	121,300,000	184,300,000
Goodwill, Acquired During Period	166,200,000	494,500,000
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,000,000,000.0
Notes Receivable, Fair Value Disclosure	0	110,000,000.0	0
Gain (Loss) on Disposition of Assets	(12,200,000)
Total acquisition consideration (cash, stock, notes, etc.)				$ 711,000,000.0
Revenues	13,978,500,000	11,554,800,000	11,333,400,000
Operating Income (Loss)	2,445,400,000	1,330,200,000	1,325,700,000
Senior notes due 2020 [Member]
Business Acquisition [Line Items]
Long-term debt, less current portion	0	300,000,000.0				$ 600,000,000.0
Other acquirees [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	4,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	28,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	267,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	1,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	22,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	296,100,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	166,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	1,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	4,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	(2,400,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 121,300,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Payments to Acquire Businesses, Net of Cash Acquired	$ 267,600,000
Finite-lived Intangible Assets Acquired	121,300,000
Goodwill, Acquired During Period	166,200,000
Envigo [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets	9,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	4,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	69,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	144,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	601,000,000.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	49,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	15,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	10,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	745,800,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	376,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	128,400,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	25,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	10,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	12,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	(25,600,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	11,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 140,800,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 years
Payments to Acquire Businesses, Net of Cash Acquired	$ 601,000,000.0
Notes Receivable, Fair Value Disclosure	70,000,000.0
Revenues	124,200,000
Operating Income (Loss)	17,900,000
CRP [Member]
Business Acquisition [Line Items]
Operating Income (Loss)	5,500,000	13,200,000
Excluding Envigo [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		286,400,000
Goodwill, Acquired During Period		115,100,000
2020 Acquisitions
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	14,032,700,000	11,717,500,000
Business Acquisition, Pro Forma Net Income (Loss)	$ 1,564,600,000	837,600,000
2019 Acquisitions
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue		11,742,500,000	11,738,500,000
Business Acquisition, Pro Forma Net Income (Loss)		$ 831,400,000	$ 906,600,000
Trade Names [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years 4 months 24 days
Finite-lived Intangible Assets Acquired	$ 200,000
Trade Names [Member] | Envigo [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 600,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years 1 month 6 days
Finite-lived Intangible Assets Acquired	$ 102,400,000
Customer Relationships [Member] | Envigo [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 141,400,000