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Share-based Compensation (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award        
Allocated share-based compensation expense $ 0.2 $ 1.7 $ 3.4 $ 8.0
Credits to share-based compensation related to forfeitures 1.8   1.8  
Share based compensation expense not yet recognized $ 8.9   $ 8.9  
Period in which unrecognized share based compensation will be recognized     2 years 175 days  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation, shares granted (shares)     200  
Share-based compensation, shares exercised (shares)     60  
Share-based compensation, stock option forfeited (shares)     150  
Share-based compensation, vesting period     4 years  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation, restricted shares granted (shares)     100  
Share-based compensation, vesting period     3 years  
Share-based compensation, shares forfeited other than options (shares)     50  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation, restricted shares granted (shares)     20  
Share-based compensation, shares vested other than options (shares)     140  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation, restricted shares granted (shares)     20  
Share-based compensation, vesting period     3 years  
Share-based compensation, shares forfeited other than options (shares)     40  
Management        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation, fair value of awards granted     $ 12.1  
Director        
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation, fair value of restricted shares granted     $ 0.4