Corporate Investments And Funds Held For Clients - Classification of Corporate Investments on the Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 3,347.8	$ 2,913.4	$ 2,083.5
Short-term marketable securities	4,498.8	384.0
Total corporate investments	$ 7,846.6	$ 3,297.4