Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents	$ 2,575.2	$ 1,908.5	$ 1,949.2
Short-term marketable securities	10.4	0.0
Long-term marketable securities	23.5	13.6
Total corporate investments	$ 2,609.1	$ 1,922.1