Interim Financial Data by Segment - Schedule of Segment Results (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]
Revenues	$ 1,589.2	$ 1,405.0	$ 3,012.1	$ 2,836.0
Earnings (Loss) before Income Taxes	176.0	87.6	276.3	200.5
Other
Segment Reporting Information [Line Items]
Earnings (Loss) before Income Taxes	(47.7)	(47.5)	(91.4)	(83.5)
Investor Communication Solutions
Segment Reporting Information [Line Items]
Revenues	1,149.2	999.5	2,164.8	2,028.2
Investor Communication Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,149.2	999.5	2,164.8	2,028.2
Earnings (Loss) before Income Taxes	174.1	95.8	270.6	211.0
Global Technology and Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenues	440.0	405.4	847.2	807.9
Earnings (Loss) before Income Taxes	$ 49.7	$ 39.3	$ 97.1	$ 73.0