Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 47.1	$ 36.2	$ 80.9	$ 73.3
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	4.8	3.4	8.4	7.4
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	35.6	28.0	60.9	56.3
System development and programming costs
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 6.7	$ 4.8	$ 11.6	$ 9.6