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Stock-Based Compensation Plans Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
MSU Expense $ 1.2 $ 1.2
Allocated Share-based Compensation Expense $ 0.1 $ 0.1
Restricted stock awards    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding on December 31, 2018 119,256  
Granted 26,826  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (7,680)  
Exchanged for common shares (47,493)  
Outstanding on December 31, 2019 90,909 119,256
Total unrecognized compensation cost $ 0.8  
Unrecognized cost, period for recognition 1 year  
Granted $ 36.68  
2009 Equity Compensation Plan | Restricted stock awards | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year  
2009 Equity Compensation Plan | Restricted stock awards | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   3 years
Selling, general and administrative expenses | Restricted stock awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 1.3 $ 1.4