Interim Financial Data by Segment - Schedule of Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 1,405.0	$ 1,292.9	$ 2,836.0	$ 2,576.2
Earnings (Loss) before Income Taxes	87.6	71.9	200.5	127.3
Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,405.0	1,292.9	2,836.0	2,576.2
Other
Segment Reporting Information [Line Items]
Earnings (Loss) before Income Taxes	(47.5)	(37.0)	(83.5)	(81.9)
Investor Communication Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	999.5	919.4	2,028.2	1,840.0
Earnings (Loss) before Income Taxes	95.8	64.9	211.0	124.9
Global Technology and Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenues	405.4	373.5	807.9	736.2
Earnings (Loss) before Income Taxes	$ 39.3	$ 44.0	$ 73.0	$ 84.3