Corporate Investments and Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 1,634.2	$ 2,575.2	$ 1,891.5
Short-term marketable securities	27.6	10.4
Long-term marketable securities	0.0	23.5
Total corporate investments	$ 1,661.8	$ 2,609.1