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Consolidated Statements of Stockholder's Equity Consolidated Statements of Stockholder's Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock, Common
Common Stock, Value, Issued $ 0.0          
Beginning balance (in shares) at Dec. 31, 2023   16,485,000        
Beginning balance at Dec. 31, 2023 668.8   $ 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   175,000        
Issuance of shares under stock plans, net (3.1)   (3.1)      
Stock Repurchased and Retired During Period, Shares   (13,000)        
Stock Repurchased and Retired During Period, Value (0.5)   (0.5)      
Ending balance (in shares) at Mar. 31, 2024   16,647,000        
Ending balance at Mar. 31, 2024 684.5   13.5 701.7 (30.7)  
Beginning balance (in shares) at Dec. 31, 2023   16,485,000        
Beginning balance at Dec. 31, 2023 668.8   14.9 684.5 (30.7)  
Net income (8.6)          
Ending balance (in shares) at Jun. 30, 2024   16,642,000        
Ending balance at Jun. 30, 2024 $ 658.6   13.5 675.8 (30.7)  
Treasury Stock, Common, Shares 0          
Treasury Stock, Value $ 0.0          
Common Stock, Value, Issued 0.0          
Beginning balance (in shares) at Mar. 31, 2024   16,647,000        
Beginning balance at Mar. 31, 2024 684.5   13.5 701.7 (30.7)  
Net income (25.8)     (25.8)    
Stock-based compensation expense 2.8   2.8      
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture   59,000        
Issuance of shares under stock plans, net $ 0.2   0.2      
Stock Repurchased and Retired During Period, Shares (64,000)          
Stock Repurchased and Retired During Period, Value $ (3.0)   (3.0)      
Ending balance (in shares) at Jun. 30, 2024   16,642,000        
Ending balance at Jun. 30, 2024 $ 658.6   13.5 675.8 (30.7)  
Treasury Stock, Common, Shares 0          
Treasury Stock, Value $ 0.0          
Common Stock, Value, Issued   $ 0.0        
Treasury Stock, Common, Shares (122,821)          
Treasury Stock, Value $ (3.3)          
Common Stock, Value, Issued 0.0          
Beginning balance (in shares) at Dec. 31, 2024   16,568,000        
Beginning balance at Dec. 31, 2024 854.6   11.5 880.8 (34.5)  
Net income (6.3)     (6.3)    
Stock-based compensation expense $ 1.4   1.4      
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 191,000 0        
Issuance of shares under stock plans, net $ (2.3)   (7.9)     $ (5.7)
Treasury Stock, Value, Acquired, Cost Method $ (10.9)          
Treasury Stock, Value, Acquired, Cost Method (380,000)          
Stock Repurchased and Retired During Period, Value $ (10.9)   0.0      
Ending balance (in shares) at Mar. 31, 2025   16,568,000        
Ending balance at Mar. 31, 2025 836.6   5.0 874.5 (34.5)  
Beginning balance (in shares) at Dec. 31, 2024   16,568,000        
Beginning balance at Dec. 31, 2024 854.6   11.5 880.8 (34.5)  
Net income (3.6)          
Ending balance (in shares) at Jun. 30, 2025   16,568,000        
Ending balance at Jun. 30, 2025 $ 836.7   6.5 877.3 (34.4)  
Treasury Stock, Common, Shares (312,000)          
Treasury Stock, Value $ (8.5)          
Common Stock, Value, Issued   $ 0.0        
Beginning balance (in shares) at Mar. 31, 2025   16,568,000        
Beginning balance at Mar. 31, 2025 836.6   5.0 874.5 (34.5)  
Net income 2.7     2.7    
Stock-based compensation expense $ 1.6   1.6      
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 2,000 0        
Issuance of shares under stock plans, net $ 0.0   (0.1)     $ 0.0
Treasury Stock, Value, Acquired, Cost Method $ (4.2)          
Treasury Stock, Value, Acquired, Cost Method (148,000)          
Stock Repurchased and Retired During Period, Value $ (4.2)   0.0      
Ending balance (in shares) at Jun. 30, 2025   16,568,000        
Ending balance at Jun. 30, 2025 836.7   $ 6.5 $ 877.3 (34.4)  
Pension and other postretirement employee benefit plans, net of tax $ 0.1       $ 0.1  
Treasury Stock, Common, Shares (458,643)          
Treasury Stock, Value $ (12.7)          
Common Stock, Value, Issued $ 0.0 $ 0.0