DEBT (Narrative) (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($)	May 31, 2020 USD ($)	Mar. 31, 2021 USD ($) item	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) item	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Discounts and debt issuance costs			$ 1,096	$ 1,258
Total long-term debt - face value			2,857,465	2,846,367		$ 3,357,899
Net proceeds		$ 741,417
Repayment of long-term debt			500,006	6
Short-term debt			$ 0	0		0
Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Number of indentures with customary investment-grade type covenants | item			3
Line of Credit [Member]
Debt Instrument [Line Items]
Transaction fees					$ 4,632
Maximum borrowing capacity			$ 1,000,000
Commitment fee			0.15%
Line of credit number of primary negative covenants | item					2
Number of quarters debt to EBITDA maximum ratio limit on certain acquisitions | item					4
Debt issued, term					5 years
Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			1.25%
Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.25%
Line of Credit [Member] | Delayed Draw Term Loan And Line Of Credit [Member]
Debt Instrument [Line Items]
Available borrowing capacity			$ 943,665
Short-term debt			$ 0
Line of Credit [Member] | Maximum, Upon Certain Acquisitions [Member]
Debt Instrument [Line Items]
Debt to EBITDA ratio			3.75
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Outstanding standby letters of credit			$ 56,335
Period of standby letters of credit			1 year
Standby Letters of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.175%
Maximum [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt to EBITDA ratio			3.50
Commitment fee			0.275%
Maximum [Member] | Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			1.875%
Maximum [Member] | Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.875%
Minimum [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Commitment fee			0.125%
Minimum [Member] | Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			1.125%
Minimum [Member] | Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.125%
Notes [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 2,857,465
Notes [Member] | Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			2,846,188
Notes [Member] | 3.50% notes due 2030 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		$ 750,000	$ 750,000	0		750,000
Maturity year		2030	2030
Interest rate		3.50%	3.50%
Notes [Member] | Floating-Rate Notes Due 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		$ 250,000	$ 0	250,000		0
Maturity year			2020
Repayment of long-term debt	$ 250,000
Notes [Member] | Floating-Rate Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 0	$ 500,000		$ 500,000
Maturity year			2021
Face value			$ 500,000