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LONG-TERM DEBT - Additional Information (Details)			1 Months Ended		3 Months Ended		12 Months Ended
	Oct. 31, 2019 USD ($)	May 30, 2018 USD ($)	Mar. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Oct. 30, 2019 USD ($)	Jan. 16, 2014 USD ($)
Debt Instrument [Line Items]
Long-term debt							$ 3,617,500,000	$ 4,227,500,000
Repayment of long-term debt							610,000,000	1,713,631,000	$ 10,000,000
Revolver | Line of Credit
Debt Instrument [Line Items]
Interest expense							3,600,000	7,700,000	0
Credit agreement, maximum capacity	$ 750,000,000									$ 450,000,000
Proceeds from lines of credit			$ 600,000,000			$ 750,000,000
Long-term debt							$ 0	600,000,000
Repayment of long-term debt				$ 750,000,000	$ 600,000,000
Revolver | Line of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Interest addition to floating rate	1.25%
Revolver | Line of Credit | LIBOR | Maximum
Debt Instrument [Line Items]
Interest addition to floating rate	1.75%
Term Loan B
Debt Instrument [Line Items]
Debt instrument face amount		$ 1,000,000,000									$ 800,000,000
Proceeds from issuance of debt		$ 1,000,000,000
Term loan period		7 years
Term loan quarterly repayment as percentage of principal		0.25%
Effective interest rate percentage							1.84%
Leverage ratio, compliance maximum		4
Leverage ratio							1.5
Interest expense							$ 18,600,000	33,300,000	$ 41,100,000
Long-term debt							$ 967,500,000	$ 977,500,000
Term Loan B | LIBOR
Debt Instrument [Line Items]
Interest addition to floating rate		1.75%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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