Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Total pretax stock-based compensation expense	$ 27.2	$ 22.8	$ 45.7	$ 36.7
Operating Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense	4.5	4.6	7.5	6.6
Selling, General And Administrative Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense	19.0	14.1	31.7	23.8
System Development And Programming Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation expense	$ 3.7	$ 4.1	$ 6.5	$ 6.3