Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense	$ 138.9	$ 137.6	$ 143.2
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	49.9	49.6	51.1
Operating Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense	21.5	23.1	27.0
Selling, General and Administrative Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense	99.2	97.4	95.8
System Development And Programming Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense	$ 18.2	$ 17.1	$ 20.4