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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  
Performance share, restricted stock unit, and stock option awards (in shares)   54      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 1.3   1.3    
Stock-based compensation expense (0.7)   (0.7)    
Pension and other postretirement employee benefit plans, net of tax 1.8       1.8
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)
Pension and OPEB, Tax 0.6        
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 33.1        
Beginning balance (in shares) at Jun. 30, 2020   16,571      
Beginning balance at Jun. 30, 2020 470.8 $ 0.0 11.8 514.9 (55.8)
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  
Performance share, restricted stock unit, and stock option awards (in shares)   2      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 1.4   1.4    
Pension and other postretirement employee benefit plans, net of tax 1.8       1.8
Beginning balance (in shares) at Jun. 30, 2020   16,571      
Beginning balance at Jun. 30, 2020 470.8 $ 0.0 11.8 514.9 (55.8)
Pension and OPEB, Tax 0.6        
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  
Performance share, restricted stock unit, and stock option awards (in shares)   105      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 2.0   2.0    
Stock-based compensation expense (1.1)   (1.1)    
Pension and other postretirement employee benefit plans, net of tax 1.9       1.9
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)
Pension and OPEB, Tax 0.7        
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 (39.6)        
Beginning balance (in shares) at Jun. 30, 2021   16,685      
Beginning balance at Jun. 30, 2021 488.1 $ 0.0 19.3 519.2 (50.5)
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)  
Performance share, restricted stock unit, and stock option awards (in shares)   7      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 1.9   1.9    
Stock-based compensation expense (0.1)   (0.1)    
Pension and other postretirement employee benefit plans, net of tax 1.9       1.9
Beginning balance (in shares) at Jun. 30, 2021   16,685      
Beginning balance at Jun. 30, 2021 488.1 $ 0.0 $ 19.3 $ 519.2 $ (50.5)
Pension and OPEB, Tax $ 0.7