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Benefit Plans - Deferred Compensation Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Interest rate earned on deferred amounts, prime rate first business day of year   4.75%   5.50%
Deferred compensation obligation $ 4.7   $ 4.4  
Annual Salary | Management        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Maximum percentage of compensation allowed to be deferred 80.00%      
Deferred Bonus | Management        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Maximum percentage of compensation allowed to be deferred 100.00%