Corporate Investments and Funds Held For Clients (Expected Maturities Of Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Jun. 30, 2020
Corporate Investments And Funds Held For Clients [Abstract]
One year or less	$ 3,916.0
One year to two years	4,603.5
Two years to three years	3,008.1
Three years to four years	2,797.0
After four years	8,946.6
Total available-for-sale securities	$ 23,271.2	$ 21,576.6