Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents		$ 1,949.2	$ 2,170.0	$ 2,780.4
Marketable Securities, Current	[1]	10.5	3.3
Long-term marketable securities	[2]	261.4	7.2
Total corporate investments		$ 2,221.1	$ 2,180.5

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

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