Acquisitions - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended						12 Months Ended
	Jun. 30, 2021	May 31, 2021	Feb. 29, 2020	Nov. 30, 2019	Oct. 31, 2019	May 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Purchase price, net of cash acquired							$ 2,603.6	$ 339.1	$ 354.7
Itiviti
Business Acquisition [Line Items]
Purchase price, net of cash acquired							2,580.4
Itiviti | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		5 years
Itiviti | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		7 years
Advisor-Stream
Business Acquisition [Line Items]
Purchase price, net of cash acquired							23.2
Advisor-Stream | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years
Advisor-Stream | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years
Shadow Financial
Business Acquisition [Line Items]
Settlement of deferred payment obligation							3.0
Purchase price, net of cash acquired								35.6
Shadow Financial | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life					5 years
Shadow Financial | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life					7 years
Fi360
Business Acquisition [Line Items]
Settlement of deferred payment obligation							3.5
Purchase price, net of cash acquired								116.0
Fi360 | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				5 years
Fi360 | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				7 years
Clear-Structure
Business Acquisition [Line Items]
Settlement of deferred payment obligation							2.2
Contingent consideration maximum potential pay out				$ 12.5
Acquisition date fair value of contingent consideration liability	$ 5.0						5.0
Purchase price, net of cash acquired								59.1
Clear-Structure | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				5 years
Clear-Structure | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life				7 years
Funds-Library
Business Acquisition [Line Items]
Purchase price, net of cash acquired								69.9
Funds-Library | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			3 years
Funds-Library | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			7 years
Rockall
Business Acquisition [Line Items]
Settlement of deferred payment obligation								0.5
Contingent consideration maximum potential pay out						$ 10.1
Acquisition date fair value of contingent consideration liability	$ 5.9						$ 5.9
Purchase price, net of cash acquired									34.9
Contingent liability term						2 years
Rockall | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life						4 years
Rockall | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life						6 years
RPM
Business Acquisition [Line Items]
Settlement of deferred payment obligation								$ 40.9
Purchase price, net of cash acquired									$ 258.3
RPM | Software Technology
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life									5 years
RPM | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life									7 years
TD Ameritrade
Business Acquisition [Line Items]
Purchase price, net of cash acquired									$ 61.5
TD Ameritrade | Customer Relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life									7 years