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Share-based Compensation (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Jun. 11, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award          
Allocated share-based compensation expense   $ 0.5 $ 1.4 $ 3.5 $ 9.1
Credits to share-based compensation related to forfeitures $ 1.8        
Share based compensation expense not yet recognized   6.2   $ 6.2  
Period in which unrecognized share based compensation will be recognized       2 years 3 months 16 days  
Corporate          
Share-based Compensation Arrangement by Share-based Payment Award          
Adjustment to share-based compensation   $ (0.9)   $ (1.8)  
Management          
Share-based Compensation Arrangement by Share-based Payment Award          
Share-based compensation, fair value of awards granted       12.5  
Director          
Share-based Compensation Arrangement by Share-based Payment Award          
Share-based compensation, fair value of restricted shares granted       $ 0.5  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award          
Share-based compensation, shares granted (shares)       190  
Share-based compensation, shares exercised (shares)       260  
Share-based compensation, stock option forfeited (shares)       200  
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)       70  
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)       30