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Share-based Compensation (Details) - Jun. 30, 2015
shares in Millions, $ in Millions
USD ($)
item
shares
Stock-based Compensation  
Number of share-based employee compensation plans | item 4
Aggregate number of shares authorized for issuance 8.1
Shares for future issuances 2.5
Maximum  
Other disclosures  
Share-based compensation awards vesting period 3 years
Share-based compensation awards maximum contractual term 10 years
Restricted stock  
Other disclosures  
Total unrecognized compensation cost related to non-vested share-based compensation awards granted under the Plans | $ $ 10.4
Weighted average period during which the cost is expected to be recognized 2 years