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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, 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, 2023   16,485      
Beginning balance at Dec. 31, 2023 668.8 $ 0.0 14.9 684.5 (30.7)
Net income 17.2     17.2  
Stock-based compensation expense 2.2   2.2    
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   175      
Issuance of shares under stock plans, net (3.1)   (3.1)    
Stock Repurchased and Retired During Period, Shares   (13)      
Stock Repurchased and Retired During Period, Value (0.5)   (0.5)    
Ending balance (in shares) at Mar. 31, 2024   16,647      
Ending balance at Mar. 31, 2024 $ 684.5 $ 0.0 $ 13.5 $ 701.7 $ (30.7)