Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 1,292.9	$ 1,259.6	$ 2,576.2	$ 2,452.5
Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	414.9	401.4	829.7	768.4
Recurring revenues
Disaggregation of Revenue [Line Items]
Revenues	840.4	793.5	1,646.2	1,543.0
Event-driven revenues
Disaggregation of Revenue [Line Items]
Revenues	37.6	64.7	100.2	141.0
Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	919.4	892.7	1,840.0	1,746.1
Investor Communication Solutions | Regulatory
Disaggregation of Revenue [Line Items]
Revenues	180.7	166.2	351.5	331.7
Investor Communication Solutions | Data-driven fund solutions
Disaggregation of Revenue [Line Items]
Revenues	96.4	88.5	188.9	171.8
Investor Communication Solutions | Issuer
Disaggregation of Revenue [Line Items]
Revenues	26.5	23.7	50.4	44.2
Investor Communication Solutions | Customer communications
Disaggregation of Revenue [Line Items]
Revenues	163.4	148.1	319.3	289.0
Investor Communication Solutions | Total ICS Recurring revenues
Disaggregation of Revenue [Line Items]
Revenues	466.9	426.5	910.1	836.7
Investor Communication Solutions | Equity and other
Disaggregation of Revenue [Line Items]
Revenues	25.2	24.6	54.7	52.2
Investor Communication Solutions | Mutual funds
Disaggregation of Revenue [Line Items]
Revenues	12.4	40.1	45.6	88.9
Investor Communication Solutions | Total ICS Event-driven revenues
Disaggregation of Revenue [Line Items]
Revenues	37.6	64.7	100.2	141.0
Investor Communication Solutions | Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	414.9	401.4	829.7	768.4
Global Technology and Operations | Capital markets
Disaggregation of Revenue [Line Items]
Revenues	235.3	221.0	462.0	429.6
Global Technology and Operations | Wealth and investment management
Disaggregation of Revenue [Line Items]
Revenues	138.2	145.9	274.2	276.8
Global Technology and Operations | Total GTO Recurring revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 373.5	$ 366.9	$ 736.2	$ 706.4