Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 33.8	$ 37.1
Number of Options (in thousands)
Options outstanding at July 1, 2020 (shares)	3,510
Options granted (shares)	1,153
Options exercised (shares)	(156)
Options forfeited/cancelled (shares)	(8)
Options outstanding at September 30, 2020 (shares)	4,499
Weighted Average Price (in dollars)
Options outstanding at July 1, 2020 (in dollars per share)	$ 126
Options granted, weighted average price (in dollar per share)	139
Options exercised, weighted average price (in dollar per share)	95
Options forfeited/cancelled, weighted average price (in dollar per share)	144
Options outstanding at September 30, 2020 (in dollars per share)	$ 130
Number of shares/units
Risk-free interest rate	0.10%	1.40%
Dividend yield	2.60%	1.90%
Weighted average volatility factor	25.80%	19.30%
Weighted average expected life (in years)	5 years 4 months 24 days	5 years 4 months 24 days
Weighted average fair value (in dollars)	$ 21.66	$ 24.40
Time Based Restricted Stock
Number of shares/units
Restricted shares/units outstanding at July 1, 2020 (in shares/units)	905
Restricted shares/units granted (in shares/units)	636
Restricted shares/units vested (in shares/units)	(340)
Restricted shares/units forfeited (in shares/units)	(9)
Restricted shares/units outstanding at September 30, 2020 (in shares/units)	1,192
Performance Based Restricted Stock
Number of shares/units
Restricted shares/units outstanding at July 1, 2020 (in shares/units)	179
Restricted shares/units granted (in shares/units)	156
Restricted shares/units vested (in shares/units)	(70)
Restricted shares/units forfeited (in shares/units)	(2)
Restricted shares/units outstanding at September 30, 2020 (in shares/units)	263
Time Based restricted Stock Units
Number of shares/units
Restricted shares/units outstanding at July 1, 2020 (in shares/units)	180
Restricted shares/units granted (in shares/units)	103
Restricted shares/units vested (in shares/units)	(73)
Restricted shares/units forfeited (in shares/units)	(1)
Restricted shares/units outstanding at September 30, 2020 (in shares/units)	209
Performance Based Restricted Stock Units
Number of shares/units
Restricted shares/units outstanding at July 1, 2020 (in shares/units)	851
Restricted shares/units granted (in shares/units)	167
Restricted shares/units vested (in shares/units)	(279)
Restricted shares/units forfeited (in shares/units)	(5)
Restricted shares/units outstanding at September 30, 2020 (in shares/units)	734
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 3.6	$ 4.0
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	25.3	28.3
System development and programming costs
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 4.9	$ 4.8