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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, 2019   16,515      
Beginning balance at Dec. 31, 2019 $ 432.0 $ 0.0 $ 9.8 $ 481.7 $ (59.5)
Net income 10.3     10.3  
Stock-based compensation expense 1.3   1.3    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   54      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture (0.7)   (0.7)    
Pension and other postretirement employee benefit plans, net of tax 1.8       1.8
Ending balance (in shares) at Mar. 31, 2020   16,569      
Ending balance at Mar. 31, 2020 444.8 $ 0.0 10.4 492.1 (57.7)
Beginning balance (in shares) at Dec. 31, 2019   16,515      
Beginning balance at Dec. 31, 2019 432.0 $ 0.0 9.8 481.7 (59.5)
Net income 54.5        
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 0.0        
Ending balance (in shares) at Sep. 30, 2020   16,571      
Ending balance at Sep. 30, 2020 496.2 $ 0.0 13.9 536.3 (54.0)
Beginning balance (in shares) at Mar. 31, 2020   16,569      
Beginning balance at Mar. 31, 2020 444.8 $ 0.0 10.4 492.1 (57.7)
Net income 22.8     22.8  
Stock-based compensation expense 1.4   1.4    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   2      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 0.0        
Pension and other postretirement employee benefit plans, net of tax 1.8       1.8
Ending balance (in shares) at Jun. 30, 2020   16,571      
Ending balance at Jun. 30, 2020 470.8 $ 0.0 11.8 514.8 (55.8)
Net income 21.4     21.4  
Stock-based compensation expense 2.2   2.2    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   1      
Pension and other postretirement employee benefit plans, net of tax 1.8       1.8
Ending balance (in shares) at Sep. 30, 2020   16,571      
Ending balance at Sep. 30, 2020 496.2 $ 0.0 13.9 536.3 (54.0)
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, 2020   16,572      
Beginning balance at Dec. 31, 2020 521.1 $ 0.0 16.6 558.8 (54.3)
Net income (37.6)        
Ending balance (in shares) at Sep. 30, 2021   16,687      
Ending balance at Sep. 30, 2021 491.6 $ 0.0 21.7 521.2 (51.3)
Beginning balance (in shares) at Mar. 31, 2021   16,678      
Beginning balance at Mar. 31, 2021 536.1 $ 0.0 17.6 570.9 (52.4)
Net income (51.6)     (51.6)  
Stock-based compensation expense 1.9   1.9    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   7      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture (0.1)   (0.1)    
Pension and other postretirement employee benefit plans, net of tax 1.9       1.9
Ending balance (in shares) at Jun. 30, 2021   16,685      
Ending balance at Jun. 30, 2021 488.1 $ 0.0 19.3 519.2 (50.5)
Net income 1.9     1.9  
Stock-based compensation expense 2.4   2.4    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   1      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture 0.0   0.0    
Pension and other postretirement employee benefit plans, net of tax (0.8)       (0.8)
Ending balance (in shares) at Sep. 30, 2021   16,687      
Ending balance at Sep. 30, 2021 $ 491.6 $ 0.0 $ 21.7 $ 521.2 $ (51.3)