Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Purchase price of common stock as percentage of market value			95.00%
Minimum percentage that will ultimately vest under performance-based restricted stock awards based on performance target	0.00%
Maximum percentage that will ultimately vest under performance-based restricted stock awards based on performance target	150.00%
Shares repurchased	2.0	0.9	5.4	6.2
Stock-based compensation expense	$ 24.3	$ 27.1	$ 41.9	$ 45.5
Total stock-based compensation - related tax benefits	9.2	10.0	15.7	16.8
Stock Options Granted Prior To July 2008 [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting term options granted			5 years
Stock options - term for stock options granted, in years			10 years
Stock Options Granted After July 2008 [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting term options granted			4 years
Stock options - term for stock options granted, in years			10 years
Non-Vested Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost	4.9		4.9
Weighted-average remaining requisite vesting period			1 year 8 months 5 days
Non-Vested Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost	$ 93.9		$ 93.9
Weighted-average remaining requisite vesting period			1 year 8 months 5 days