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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, 2021   16,692      
Beginning balance at Dec. 31, 2021 $ 511.7 $ 0.0 $ 23.6 $ 530.7 $ (42.6)
Net income 16.6     16.6  
Stock-based compensation expense 2.0   2.0    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   119      
Issuance of shares under stock plans, net (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)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent 0.4        
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 31.3        
Ending balance (in shares) at Jun. 30, 2022   16,770      
Ending balance at Jun. 30, 2022 544.7 $ 0.0 23.0 562.0 (40.3)
Beginning balance (in shares) at Mar. 31, 2022   16,811      
Beginning balance at Mar. 31, 2022 530.0 $ 0.0 24.1 547.3 (41.4)
Net income 14.7     14.7  
Stock-based compensation expense 3.8   3.8    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   78      
Issuance of shares under stock plans, net (1.0)   (1.0)    
Pension and other postretirement employee benefit plans, net of tax $ 1.1       1.1
Stock Repurchased and Retired During Period, Shares (119)        
Stock Repurchased and Retired During Period, Value $ (3.9)   (3.9)    
Ending balance (in shares) at Jun. 30, 2022   16,770      
Ending balance at Jun. 30, 2022 544.7 $ 0.0 23.0 562.0 (40.3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent 0.4        
Beginning balance (in shares) at Dec. 31, 2022   16,762      
Beginning balance at Dec. 31, 2022 572.1 $ 0.0 28.5 576.8 (33.3)
Net income 23.8     23.8  
Stock-based compensation expense 2.2   2.2    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   242      
Issuance of shares under stock plans, net (4.2)   (4.2)    
Pension and other postretirement employee benefit plans, net of tax (0.1)       (0.1)
Stock Repurchased and Retired During Period, Shares   (51)      
Stock Repurchased and Retired During Period, Value (1.7)   (1.7)    
Ending balance (in shares) at Mar. 31, 2023   16,953      
Ending balance at Mar. 31, 2023 592.0 $ 0.0 24.7 600.6 (33.4)
Beginning balance (in shares) at Dec. 31, 2022   16,762      
Beginning balance at Dec. 31, 2022 572.1 $ 0.0 28.5 576.8 (33.3)
Net income 53.5        
Ending balance (in shares) at Jun. 30, 2023   16,708      
Ending balance at Jun. 30, 2023 614.5 $ 0.0 17.7 630.3 (33.4)
Beginning balance (in shares) at Mar. 31, 2023   16,953      
Beginning balance at Mar. 31, 2023 592.0 $ 0.0 24.7 600.6 (33.4)
Net income 29.7     29.7  
Stock-based compensation expense 1.7   1.7    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   18      
Issuance of shares under stock plans, net (0.4)   (0.4)    
Pension and other postretirement employee benefit plans, net of tax (0.1)       (0.1)
Stock Repurchased and Retired During Period, Shares   (263)      
Stock Repurchased and Retired During Period, Value (8.4)   (8.4)    
Ending balance (in shares) at Jun. 30, 2023   16,708      
Ending balance at Jun. 30, 2023 $ 614.5 $ 0.0 $ 17.7 $ 630.3 $ (33.4)