Corporate Investments And Funds Held For Clients (Schedule Of Investment Of Funds Held For Clients) (Details) - USD ($) $ in Millions		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Marketable Securities [Line Items]
Restricted cash and cash equivalents held to satisfy client funds obligations	[1]	$ 5,145.1	$ 4,847.0	$ 4,372.1
Total funds held for clients		26,708.1	29,434.2
Current [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Restricted		5,541.2	5,013.9
Non-current [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Restricted		$ 16,021.8	$ 19,573.3

[1] See Note 4 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.