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Share-Based Compensation - Expense (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Sep. 30, 2015
Sep. 30, 2015
Unearned non-cash share-based compensation        
Weighted average period for recognition of share-based compensation expense       2 years 1 month 6 days
Unearned non-cash share-based compensation expense expected to be recognized     $ 6.7 $ 6.7
Estimated forfeiture rate (as a percent)       2.00%
Compensation expense     $ 0.3 $ 0.6
Restricted Stock Units (RSUs)        
Unearned non-cash share-based compensation        
Granted (in shares)   7,000,000    
Vesting period 4 years