Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 55.6	$ 47.1	$ 97.9	$ 80.9
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	5.2	4.8	9.9	8.4
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	42.7	35.6	74.1	60.9
System development and programming costs
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 7.7	$ 6.7	$ 13.9	$ 11.6