Corporate Investments And Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions		Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2016	[1]
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents		$ 2,170.0	$ 2,780.4	[1]	$ 3,191.1
Marketable Securities, Current	[2]	3.3	3.2
Long-term marketable securities	[3]	7.2	7.6
Total corporate investments		$ 2,180.5	$ 2,791.2

[1] See Note 1 for a summary of adjustments.

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

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