Corporate Investments and Funds Held For Clients (Schedule Of Investment Of Funds Held For Clients) (Details) - USD ($) $ in Millions	Mar. 31, 2020		Jun. 30, 2019	Mar. 31, 2019	[1]
Debt Securities, Available-for-sale [Line Items]
Restricted cash and cash equivalents held to satisfy client funds obligations	$ 6,814.0	[1]	$ 4,847.0	$ 12,385.3
Total funds held for clients	30,834.4		29,434.2
Current
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, restricted	5,799.0		5,013.9
Non-current
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, restricted	$ 18,221.4		$ 19,573.3

[1] See Note 6 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.