Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 1,811.7	$ 1,726.5	$ 4,823.7	$ 4,562.5
Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	1,347.5	1,301.4	3,512.3	3,329.6
Total ICS Recurring revenues \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	739.8	701.1	1,773.0	1,663.2
Regulatory \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	365.0	344.6	765.4	718.7
Data-driven fund solutions \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	114.8	106.2	337.4	313.3
Issuer \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	60.5	59.6	127.4	118.7
Customer communications \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	199.5	190.8	542.8	512.5
Total ICS Event-driven revenues \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	52.7	67.0	240.3	209.2
Equity and other \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	31.4	46.0	77.2	108.9
Mutual funds \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	21.3	21.1	163.2	100.3
Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	555.0	533.3	1,499.0	1,457.2
Distribution revenues \| Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	555.0	533.3	1,499.0	1,457.2
Total GTO Recurring revenues \| Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	464.1	425.1	1,311.4	1,233.0
Capital markets \| Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	289.4	265.8	829.9	776.7
Wealth and investment management \| Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	174.7	159.3	481.5	456.3
Recurring revenues
Disaggregation of Revenue [Line Items]
Revenues	1,203.9	1,126.2	3,084.3	2,896.2
Event-driven revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 52.7	$ 67.0	$ 240.3	$ 209.2