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GOODWILL AND INTANGIBLE ASSETS, NET- Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024	Apr. 30, 2026	Nov. 01, 2024
Intangible Asset, Finite-Lived [Line Items]
Goodwill	$ 3,787,800,000	$ 3,609,600,000
Goodwill impairment	0	0	$ 0
Investor Communication Solutions
Intangible Asset, Finite-Lived [Line Items]
Goodwill	1,205,900,000	1,090,700,000
Global Technology and Operations
Intangible Asset, Finite-Lived [Line Items]
Goodwill	2,581,900,000	2,518,900,000
Acolin, iJoin And Signal \| Investor Communication Solutions
Intangible Asset, Finite-Lived [Line Items]
Goodwill	117,900,000
CQG, Inc.
Intangible Asset, Finite-Lived [Line Items]
Goodwill				$ 77,700,000
CQG, Inc. \| Global Technology and Operations
Intangible Asset, Finite-Lived [Line Items]
Goodwill	$ 77,700,000
SIS
Intangible Asset, Finite-Lived [Line Items]
Goodwill		$ 38,300,000			$ 38,300,000
Minimum \| Internal use software
Intangible Asset, Finite-Lived [Line Items]
Estimated useful lives of assets	3 years
Maximum \| Internal use software
Intangible Asset, Finite-Lived [Line Items]
Estimated useful lives of assets	5 years