Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 1,405.0	$ 1,292.9	$ 2,836.0	$ 2,576.2
Recurring revenues
Disaggregation of Revenue [Line Items]
Revenues	898.8	840.4	1,770.0	1,646.2
Event-driven revenues
Disaggregation of Revenue [Line Items]
Revenues	55.2	37.6	142.1	100.2
Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	450.9	414.9	923.9	829.7
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	1,405.0	1,292.9	2,836.0	2,576.2
Operating Segments | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	999.5	919.4	2,028.2	1,840.0
Operating Segments | Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	405.4	373.5	807.9	736.2
Operating Segments | Distribution revenues | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	450.9	414.9	923.9	829.7
Operating Segments | Total ICS Recurring revenues | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	493.4	466.9	962.2	910.1
Operating Segments | Regulatory | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	194.7	180.7	374.1	351.5
Operating Segments | Data-driven fund solutions | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	105.3	96.4	207.1	188.9
Operating Segments | Issuer | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	30.6	26.5	59.2	50.4
Operating Segments | Customer communications | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	162.7	163.4	321.8	319.3
Operating Segments | Total ICS Event-driven revenues | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	55.2	37.6	142.1	100.2
Operating Segments | Equity and other | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	22.1	25.2	62.9	54.7
Operating Segments | Mutual funds | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	33.1	12.4	79.2	45.6
Operating Segments | Total GTO Recurring revenues | Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	405.4	373.5	807.9	736.2
Operating Segments | Capital markets | Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	262.4	235.3	510.9	462.0
Operating Segments | Wealth and investment management | Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	$ 143.0	$ 138.2	$ 296.9	$ 274.2