Interim Financial Data by Segment - Schedule of Amortization of Acquired Intangibles and Purchased Intellectual Property by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Amortization of acquired intangibles and purchased intellectual property	$ 49.5	$ 49.9	$ 97.7	$ 100.7
Investor Communication Solutions | Operating Segments
Segment Reporting Information [Line Items]
Amortization of acquired intangibles and purchased intellectual property	10.9	11.4	22.5	22.8
Global Technology and Operations | Operating Segments
Segment Reporting Information [Line Items]
Amortization of acquired intangibles and purchased intellectual property	$ 38.6	$ 38.5	$ 75.2	$ 77.9