Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 33.4	$ 45.2	$ 106.7	$ 122.2
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	3.0	4.1	10.5	12.9
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	26.1	36.1	82.3	94.6
System development and programming costs
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 4.3	$ 5.0	$ 13.9	$ 14.7