ACQUISITIONS - Additional Information (Details) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 01, 2024	May 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($) acquisition
Business Combination [Line Items]
Cash payments				$ 193.5	$ 34.3	$ 0.0
Goodwill				3,609.6	3,469.4
Number of businesses acquired | acquisition						0
SIS
Business Combination [Line Items]
Weighted average useful life	10 years
Aggregate purchase price				185.5
Cash payments				185.5
Net tangible liabilities assumed				(1.9)
Goodwill				38.3	$ 38.6
Intangible assets				$ 149.1
2024 Immaterial Acquisition
Business Combination [Line Items]
Aggregate purchase price			$ 8.0
AdvisorTarget
Business Combination [Line Items]
Weighted average useful life		5 years
Cash payments		$ 34.3
Deferred payments		0.2
Settlement of preexisting relationship		1.6
Contingent consideration maximum potential pay out		30.5
Net tangible liabilities assumed		(0.8)
Acquisition date fair value of contingent consideration liability		14.0
Goodwill		38.6
Intangible assets		$ 12.1