Corporate Investments and Funds Held for Clients - Schedule of Investment of Funds Held for Clients (Details) - USD ($) $ in Millions		Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Marketable Securities [Line Items]
Restricted cash and cash equivalents held to satisfy client funds obligations	[1]	$ 6,395.1	$ 1,706.8	$ 7,172.6
Total funds held for clients		43,957.8	30,985.7
Current
Marketable Securities [Line Items]
Restricted short-term and long term marketable securities held to satisfy client funds obligations		5,871.3	3,155.7
Long-term
Marketable Securities [Line Items]
Restricted short-term and long term marketable securities held to satisfy client funds obligations		$ 31,691.4	$ 26,123.2

[1] See Note 5 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.