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Share and Incentive-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended 9 Months Ended
Oct. 31, 2016
Jun. 30, 2018
Sep. 30, 2018
Oct. 01, 2016
Share and Incentive Based Compensation Arrangement        
Shares authorized for issuance       4,600,000
Performance units weighted average grant date fair value $ 100      
Performance units weighted average grant date fair value aggregate intrinsic value     $ 4.8  
Restricted Stock        
Share and Incentive Based Compensation Arrangement        
Compensation yet not yet recognized     $ 5.6  
Compensation yet not yet recognized period     2 years 4 months 24 days  
Aggregate intrinsic value of vested awards     $ 15.9  
Restricted Stock | Minimum        
Share and Incentive Based Compensation Arrangement        
Vesting period     1 year  
Restricted Stock | Maximum        
Share and Incentive Based Compensation Arrangement        
Vesting period   3 years    
Performance Share Units        
Share and Incentive Based Compensation Arrangement        
Aggregate intrinsic value of vested awards     $ 2.7