Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 1,589.2	$ 1,405.0	$ 3,012.1	$ 2,836.0
Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	1,149.2	999.5	2,164.8	2,028.2
Total ICS Recurring revenues | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	540.2	493.4	1,033.2	962.2
Regulatory | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	210.5	194.7	400.4	374.1
Data-driven fund solutions | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	114.5	105.3	222.5	207.1
Issuer | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	36.0	30.6	66.9	59.2
Customer communications | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	179.2	162.7	343.4	321.8
Total ICS Event-driven revenues | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	124.6	55.2	187.6	142.1
Equity and other | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	24.6	22.1	45.8	62.9
Mutual funds | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	99.9	33.1	141.9	79.2
Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	484.5	450.9	944.0	923.9
Distribution revenues | Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	484.5	450.9	944.0	923.9
Total GTO Recurring revenues | Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	440.0	405.4	847.2	807.9
Capital markets | Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	279.4	262.4	540.4	510.9
Wealth and investment management | Global Technology and Operations
Disaggregation of Revenue [Line Items]
Revenues	160.6	143.0	306.8	296.9
Recurring revenues
Disaggregation of Revenue [Line Items]
Revenues	980.2	898.8	1,880.5	1,770.0
Event-driven revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 124.6	$ 55.2	$ 187.6	$ 142.1