Corporate Investments and Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 1,828.4	$ 1,436.3	$ 1,634.2
Short-term marketable securities	26.3	47.0
Long-term marketable securities	0.0	122.1
Total corporate investments	$ 1,854.7	$ 1,605.4