Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 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%
Shares repurchased	2.0	1.4	8.2	3.8
Total stock-based compensation expense	$ 20.4	$ 21.8	$ 66.1	$ 58.5
Total stock-based compensation - related tax benefits	7.5	8.2	24.4	21.8
Compensation expense recognition			Compensation expense is recognized on a straight-line basis over the vesting period
Employer contributions			81.3
Expected future employer contribution	2.7		2.7
Stock Options Granted Prior To July 2008 [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock options - term for stock options granted, in years			10 years
Vesting term options granted			5 years
Stock Options Granted After July 2008 [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock options - term for stock options granted, in years			10 years
Vesting term options granted			4 years
Performance-Based Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
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%
Weighted-average remaining requisite vesting period			18 months
Subsequent service period			6 months
Performance period			1 year
Non-Vested Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost	10.6		10.6
Weighted-average remaining requisite vesting period			1 year 10 months 24 days
Non-Vested Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost	$ 51.2		$ 51.2
Weighted-average remaining requisite vesting period			1 year 4 months 24 days
Time-Based Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Straight-line basis over the restriction period of time based restricted stock			5 years