DERIVATIVE INSTRUMENTS - Narrative (Details) € in Millions, shares in Millions	1 Months Ended				12 Months Ended
	Feb. 29, 2024 USD ($) shares	Dec. 31, 2023 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 EUR (€)	Nov. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 EUR (€)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Stock repurchase program, authorized amount		$ 196,000,000.0						$ 294,000,000.0	$ 200,000,000.0
Accumulated other comprehensive loss						$ (795,100,000)			(662,400,000)
June 2022 Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Stock repurchase program, authorized amount									200,000,000.0
June 2022 Forward Contracts | Common Class A
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Shares repurchase cash payment	$ 200,000,000.0
Shares repurchase by shares (in shares) | shares	27.0
Net investment hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign exchange risk exposure, amount | €							€ 1,611.6			€ 701.3
Other Foreign Currency Translation Adjustments | Net investment hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Accumulated other comprehensive loss						14,600,000			(12,200,000)
Cross-currency swap contracts | Net investment hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount terminated				$ 550,000,000.0
Payments for hedge termination			$ 37,600,000
Notional amount						1,797,600,000			1,653,500,000
Foreign exchange forward contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Accumulated cash flow hedges in AOCI/(L), net of tax						2,100,000			700,000
Cash flow hedge to be reclassified from AOCI/(L) during next 12 months						2,000,000.0
Foreign exchange forward contracts | Net investment hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount						22,300,000			28,000,000.0
Foreign exchange forward contracts | Other Foreign Currency Translation Adjustments | Net investment hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Accumulated other comprehensive loss						$ (37,600,000)			(37,600,000)
Interest rate swap contracts | Interest Rate Risk
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount terminated					$ 200,000,000.0
Payments for hedge termination					$ 1,900,000
Notional amount									$ 200,000,000.0
Cash receipt from interest rate swap contracts		$ 2,100,000