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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders' Equity Attributable to Parent, Total $ 511.7   $ 23.6 $ 530.7 $ (42.6)  
Shares, Outstanding, Beginning Balance at Dec. 31, 2021   16,692,000        
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2021 511.7   23.6 530.7 (42.6)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 46.0     46.0    
APIC, Share-based Payment Arrangement, Increase for Cost Recognition     11.7      
Performance share and restricted stock unit awards (in shares)   220,000        
Performance share and restricted stock unit awards (1.8)   (1.8)      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 9.3       (9.3)  
Stock Repurchased and Retired During Period, Value $ (5.0)   (5.0)      
Number of shares repurchased (in shares) (150,000)          
Shares, Outstanding, Ending Balance at Dec. 31, 2022   16,762,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders' Equity Attributable to Parent, Total $ 572.1   28.5 576.8 (33.3)  
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2022 572.1   28.5 576.8 (33.3)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 107.7     107.7    
APIC, Share-based Payment Arrangement, Increase for Cost Recognition     9.0      
Performance share and restricted stock unit awards (in shares)   266,000        
Performance share and restricted stock unit awards (4.7)   (4.7)      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 2.6       (2.6)  
Stock Repurchased and Retired During Period, Value $ (17.9)   (17.9)      
Number of shares repurchased (in shares) (543,000)          
Shares, Outstanding, Ending Balance at Dec. 31, 2023   16,485,000        
Common Stock, Value, Issued, Ending Balance at Dec. 31, 2023 $ 0.0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Treasury Stock, Common, Shares 0          
Treasury Stock, Value $ 0.0          
Stockholders' Equity Attributable to Parent, Total 668.8   14.9 684.5 (30.7)  
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2023 668.8   14.9 684.5 (30.7)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 196.3     196.3    
APIC, Share-based Payment Arrangement, Increase for Cost Recognition     6.0      
Performance share and restricted stock unit awards (in shares)   247,000        
Performance share and restricted stock unit awards (2.7)   (2.7)      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (3.8)       3.8  
Treasury Stock, Shares, Acquired           (123,000)
Treasury Stock, Value, Acquired, Cost Method           $ (3.3)
Stock Repurchased and Retired During Period, Value $ (10.0)   (6.7)      
Number of shares repurchased (in shares) (164,000)          
Shares, Outstanding, Ending Balance at Dec. 31, 2024   16,568,000        
Common Stock, Value, Issued, Ending Balance at Dec. 31, 2024 $ 0.0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Treasury Stock, Common, Shares (122,821)          
Treasury Stock, Value $ (3.3)          
Stockholders' Equity Attributable to Parent, Total $ 854.6   $ 11.5 $ 880.8 $ (34.5)