Acquisitions - Financial Information on Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Cash payments, net of cash acquired	$ 2,603.6	$ 339.1	$ 354.7
Goodwill	3,720.1	1,674.5
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	7.3
Aggregate purchase price	2,613.8
Net tangible assets acquired / (liabilities assumed)	(259.6)
Goodwill	1,958.2
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)	(256.6)
Goodwill	1,932.4
Intangible assets	904.6
Advisor-Stream
Business Acquisition [Line Items]
Cash payments, net of cash acquired	23.2
Deferred payments, net	2.9
Contingent consideration liability	7.3
Aggregate purchase price	33.4
Net tangible assets acquired / (liabilities assumed)	(3.0)
Goodwill	25.8
Intangible assets	$ 10.5
Fiscal Year 2020 Acquisitions
Business Acquisition [Line Items]
Cash payments, net of cash acquired		298.0
Deferred payments, net		10.4
Contingent consideration liability		7.0
Aggregate purchase price		315.4
Net tangible assets acquired / (liabilities assumed)		(13.1)
Goodwill		198.9
Intangible assets		129.6
Shadow Financial
Business Acquisition [Line Items]
Cash payments, net of cash acquired		35.6
Deferred payments, net		3.0
Contingent consideration liability		0.0
Aggregate purchase price		38.6
Net tangible assets acquired / (liabilities assumed)		(0.1)
Goodwill		17.6
Intangible assets		21.1
Fi360
Business Acquisition [Line Items]
Cash payments, net of cash acquired		116.0
Deferred payments, net		3.5
Contingent consideration liability		0.0
Aggregate purchase price		119.5
Net tangible assets acquired / (liabilities assumed)		(7.9)
Goodwill		84.4
Intangible assets		43.1
Clear-Structure
Business Acquisition [Line Items]
Cash payments, net of cash acquired		59.1
Deferred payments, net		2.1
Contingent consideration liability		7.0
Aggregate purchase price		68.3
Net tangible assets acquired / (liabilities assumed)		0.2
Goodwill		44.2
Intangible assets		23.9
Funds-Library
Business Acquisition [Line Items]
Cash payments, net of cash acquired		69.9
Deferred payments, net		0.0
Contingent consideration liability		0.0
Aggregate purchase price		69.9
Net tangible assets acquired / (liabilities assumed)		(3.1)
Goodwill		39.2
Intangible assets		33.8
Other Acquisitions
Business Acquisition [Line Items]
Cash payments, net of cash acquired		17.3
Deferred payments, net		1.7
Contingent consideration liability		0.0
Aggregate purchase price		19.1
Net tangible assets acquired / (liabilities assumed)		(2.2)
Goodwill		13.5
Intangible assets		$ 7.8
Fiscal Year 2019 Acquisitions
Business Acquisition [Line Items]
Cash payments, net of cash acquired			354.7
Deferred payments, net			41.4
Contingent consideration liability			7.9
Aggregate purchase price			404.0
Net tangible assets acquired / (liabilities assumed)			3.9
Goodwill			239.8
Intangible assets			160.3
Rockall
Business Acquisition [Line Items]
Cash payments, net of cash acquired			34.9
Deferred payments, net			0.5
Contingent consideration liability			7.0
Aggregate purchase price			42.4
Net tangible assets acquired / (liabilities assumed)			(2.9)
Goodwill			31.1
Intangible assets			14.2
RPM
Business Acquisition [Line Items]
Cash payments, net of cash acquired			258.3
Deferred payments, net			40.9
Contingent consideration liability			0.8
Aggregate purchase price			300.1
Net tangible assets acquired / (liabilities assumed)			6.8
Goodwill			181.6
Intangible assets			111.7
TD Ameritrade
Business Acquisition [Line Items]
Cash payments, net of cash acquired			61.5
Deferred payments, net			0.0
Contingent consideration liability			0.0
Aggregate purchase price			61.5
Net tangible assets acquired / (liabilities assumed)			0.0
Goodwill			27.1
Intangible assets			$ 34.4