Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents		$ 1,908.5	$ 1,949.2	$ 2,170.0
Marketable Securities, Current		0.0	10.5
Long-term marketable securities	[1]	13.6	261.4
Total corporate investments		$ 1,922.1	$ 2,221.1

[1] Long-term marketable securities are included within Other assets on the Consolidated Balance Sheets.