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Incentive and Deferred Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Annual Incentive Plan      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Accrued bonuses   $ 2.6  
Payments to employees $ 1.1    
401(k) Plan      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Retirement plan, employer matching contribution, percent of match   100.00% 100.00%
Retirement plan, employer matching contribution, percent of employees' gross pay (up to)   10.00% 10.00%
Retirement plan, cost recognized   $ 1.1 $ 2.2
Percent of employee contributions vesting immediately   100.00% 100.00%
Retirement plan, employer matching contribution, vesting period   4 years