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Summary of Performance Based Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Award [Line Items]        
Percentage of total units vested     100.00%  
Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Performance vesting period     3 years  
Balance at Beginning of Period (in shares)     246,052  
Granted (in shares)     88,538  
Vested (in shares)     (104,770)  
Forfeited (in shares)     0  
Balance at End of Period (in shares) 229,820   229,820  
Share-based compensation expense $ 1.3 $ 1.1 $ 3.7 $ 3.2
Share-based compensation not yet recognized $ 9.4   $ 9.4  
Share-based compensation not yet recognized, period for recognition     2 years  
2017 Grant | Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Percentage of total units vested     199.00%  
Balance at Beginning of Period (in shares)     104,770  
Vested (in shares)     (104,770)  
Balance at End of Period (in shares) 0   0  
Weighted average grant date fair value (in dollars per share) $ 31.64   $ 31.64  
2018 Grant | Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Percentage of total units vested     161.00%  
Balance at Beginning of Period (in shares)     60,040  
Balance at End of Period (in shares) 60,040   60,040  
Weighted average grant date fair value (in dollars per share) $ 64.60   $ 64.60  
2019 Grant | Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Percentage of total units vested     135.00%  
Balance at Beginning of Period (in shares)     81,242  
Balance at End of Period (in shares) 81,242   81,242  
Weighted average grant date fair value (in dollars per share) $ 56.49   $ 56.49  
2020 Grant | Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Percentage of total units vested     152.00%  
Granted (in shares)     88,538  
Balance at End of Period (in shares) 88,538   88,538  
Weighted average grant date fair value (in dollars per share) $ 59.81   $ 59.81  
Minimum | Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Percentage of total units vested     0.00%  
Maximum | Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Percentage of total units vested     200.00%  
Maximum | 2017 Grant | Performance Based Shares        
Share-based Compensation Arrangement by Award [Line Items]        
Vested (in shares)     (208,867)