Share-Based Compensation (Details 8) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Additional disclosures
Compensation cost	$ 13.1	$ 13.3	$ 14.4
Director's Plan
Share-based compensation disclosures
Percentage of Director's annual retainer paid in stock instead of cash	50.00%
Percentage of units vests following the grant date	25.00%
Stock vesting period with reference to service term	3 months
Percentage of Director's committee chair fees paid in stock instead of cash	100.00%
Number of Units
Balance at the beginning of the period (in shares)	221,410	195,701	162,864
Granted (in shares)	21,710	22,660	29,822
Dividend equivalents (in shares)	3,399	3,049	3,015
Balance at the end of the period (in shares)	246,519	221,410	195,701
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 27.10	$ 25.81	$ 22.66
Granted (in dollars per share)	$ 53.53	$ 47.89	$ 36.45
Balance at the end of the period (in dollars per share)	$ 30.06	$ 27.10	$ 25.81
Additional disclosures
Shares vesting period	1 year
Compensation cost	1.2	1.1	1.0
Unvested stock option cost	$ 0.3
Unvested stock option weighted average remaining life	3 months 18 days
Director's Plan | Minimum
Share-based compensation disclosures
Percentage of Director's annual retainer paid in stock instead of cash	50.00%