Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Narrative (Details)

v3.20.4
Employee Benefit Plans - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
h
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Requisite service years 1 year    
Hours of service (in hours) | h 1,000    
Matched contribution 6.00%    
Employer contribution amount $ 0.5 $ 0.3 $ 0.1
Requisite service period 1 year    
Discount rate 2.75% 3.25% 4.25%
Projected benefit obligation $ 1.0    
Reclassification adjustment from AOCI, net of tax 0.2 $ 0.2 $ 0.2
Reclassification adjustment from AOCI, tax $ 0.1 $ 0.1 $ 0.1
Expected return on Pension Plan assets 7.00% 7.00% 7.00%
Inflation rate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected return on Pension Plan assets 2.50%    
Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected return on Pension Plan assets 2.50%    
Allocation of expected return on plan assets (in percentage) 66.66667%    
Fixed income securities | Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation (in percentage) 30.00%    
Fixed income securities | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation (in percentage) 80.00%    
Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected return on Pension Plan assets 8.50%    
Allocation of expected return on plan assets (in percentage) 33.33333%    
Equity securities | Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation (in percentage) 20.00%    
Equity securities | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation (in percentage) 60.00%