Acquisitions - Financial Information on Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	May 31, 2021
Business Acquisition [Line Items]
Cash payments, net of cash acquired	$ 0.0	$ 13.3	$ 2,603.6
Goodwill	$ 3,461.6	$ 3,484.9
Fiscal Year 2021 Acquisitions
Business Acquisition [Line Items]
Cash payments, net of cash acquired			2,603.6
Deferred payments, net			2.9
Contingent consideration liability			8.5
Aggregate purchase price			2,615.0
Net tangible assets acquired / (liabilities assumed)			(256.2)
Goodwill			1,956.0
Intangible assets			915.1
Itiviti
Business Acquisition [Line Items]
Cash payments, net of cash acquired			2,580.4
Deferred payments, net			0.0
Contingent consideration liability			0.0
Aggregate purchase price			2,580.4
Net tangible assets acquired / (liabilities assumed)			(252.9)
Goodwill			1,928.7	$ 1,928.7
Intangible assets			904.6	$ 904.6
Advisor-Stream
Business Acquisition [Line Items]
Cash payments, net of cash acquired			23.2
Deferred payments, net			2.9
Contingent consideration liability			8.5
Aggregate purchase price			34.5
Net tangible assets acquired / (liabilities assumed)			(3.3)
Goodwill			27.3
Intangible assets			$ 10.5