Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 201.7	$ 175.3	$ 130.8
Income tax benefit	49.1	43.0	32.2
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	19.7	17.9	13.7
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	155.7	133.9	99.1
System development and programming costs
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 26.3	$ 23.5	$ 18.0