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Consolidated Statements of Stockholder's Equity Consolidated Statements of Stockholder's Equity - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2020   16,572      
Beginning balance at Dec. 31, 2020 $ 521.1 $ 0.0 $ 16.6 $ 558.8 $ (54.3)
Net income 12.1     12.1  
Stock-based compensation expense 2.0   2.0    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   105      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture (1.1)   (1.1)    
Pension and other postretirement employee benefit plans, net of tax 1.9       1.9
Ending balance (in shares) at Mar. 31, 2021   16,678      
Ending balance at Mar. 31, 2021 536.1 $ 0.0 17.6 570.9 (52.4)
Beginning balance (in shares) at Dec. 31, 2021   16,692      
Beginning balance at Dec. 31, 2021 511.7 $ 0.0 23.6 530.7 (42.6)
Net income 16.6        
Stock-based compensation expense 2.0   2.0    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   119      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture (1.5)   (1.5)    
Pension and other postretirement employee benefit plans, net of tax 1.1       1.1
Ending balance (in shares) at Mar. 31, 2022   16,811      
Ending balance at Mar. 31, 2022 $ 530.0 $ 0.0 $ 24.1 $ 547.3 $ (41.4)