Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 1,422.9	$ 1,431.1
Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	1,015.6	1,028.6
Total ICS Recurring revenues \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	493.1	468.8
Regulatory \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	189.9	179.4
Data-driven fund solutions \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	108.0	101.8
Issuer \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	30.9	28.5
Customer communications \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	164.2	159.1
Total ICS Event-driven revenues \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	63.0	86.9
Equity and other \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	21.1	40.8
Mutual funds \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	41.9	46.1
Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	459.5	473.0
Distribution revenues \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	459.5	473.0
Total GTO Recurring revenues \| Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	407.2	402.4
Capital markets \| Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	261.0	248.5
Wealth and investment management \| Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	146.2	153.9
Recurring revenues
Disaggregation of Revenue [Line Items]
Revenues	900.3	871.2
Event-driven revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 63.0	$ 86.9