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Share-Based Compensation (Summary of Share-Based Awards Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Payment Arrangement [Abstract]        
Share-based Payment Arrangement, Expense, Tax Benefit $ 0.0 $ 0.0 $ 0.4 $ 0.3
Number of Shares        
Nonvested, beginning of period (in shares)     34  
Granted (in shares)     219  
Vested (in shares)     (194)  
Forfeited (in shares)     0  
Nonvested, end of period (in shares) 59   59  
Weighted Average Grant Date Fair Value per Share        
Nonvested, beginning of period (in dollars per share)     $ 12.00  
Granted (in dollars per share)     9.14  
Vested (in dollars per share)     9.67  
Forfeited (in dollars per share)     0  
Nonvested, end of period (in dollars per share) $ 9.05   $ 9.05