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Share-Based Compensation (Details 7) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Share-based compensation disclosures      
Compensation cost $ 10.0 $ 11.4 $ 13.1
Total Stockholder Return Awards      
Share-based compensation disclosures      
TSR measurement period 3 years    
Shares vesting period 3 years    
Compensation cost $ 0.8 $ 3.9 $ 3.7
Total Stockholder Return Awards | Minimum      
Share-based compensation disclosures      
Target shares awarded percentage 0.00%    
Total Stockholder Return Awards | Maximum      
Share-based compensation disclosures      
Target shares awarded percentage 200.00%