Corporate Investments and Funds Held For Clients (Expected Maturities Of Available-For-Sale Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Jun. 30, 2021
Corporate Investments And Funds Held For Clients [Abstract]
One year or less	$ 4,369.1
One year to two years	3,331.9
Two years to three years	2,834.6
Three years to four years	5,597.8
After four years	10,987.5
Total available-for-sale securities	$ 27,120.9	$ 24,371.7