Stock-Based Compensation (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Stock-Based Compensation (Additional Textual) [Abstract]
Maximum period of achievement of performance goals to earn performance units	3 years
Minimum performance period of individual required to earn performance units	3 years
Stock Option [Member]
Stock-Based Compensation (Textual) [Abstract]
Compensation expense related to stock option	$ 3.0	$ 2.8
Unrecognized compensation cost	4.6
Unrecognized compensation costs, weighted average period	2 years 10 months 24 days
Weighted average fair value of options granted	$ 13.79	$ 13.52
Fair value of options vested	4.5	4.5
Tax benefits resulting from stock-based compensation deductions in excess of amounts reported for financial reporting purposes	3.4	0.7
Cash received from the exercise of capital stock option	8.7	1.7
Tax benefit from the exercise of capital stock option	1.8	0.3
Total Intrinsic value of options exercised	6.3	1.1
Restricted Stock Units - Time Vesting Performance Vesting [Member]
Stock-Based Compensation (Textual) [Abstract]
Compensation expense related to stock option	5.7	7.1
Unrecognized compensation cost	$ 23.0
Unrecognized compensation costs, weighted average period	2 years 9 months 18 days