Annual report pursuant to Section 13 and 15(d)

Pension and Other Postretirement Benefits - Narrative (Details)

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Pension and Other Postretirement Benefits - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
h
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Matched contribution 6.00%    
Employer contribution amount $ 0.6 $ 0.5 $ 0.3
Hours of service (in hours) | h 1,000    
Requisite service period 1 year    
Discount rate 3.00% 2.75% 3.25%
Projected benefit obligation $ (0.7)    
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%