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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Common Stock
Additional Paid In Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2023   33,587,701        
Accumulated gain at beginning of period at Dec. 31, 2023 $ 670.3 $ 0.3 $ 244.7 $ 693.8 $ (302.2) $ 33.7
Beginning balance, treasury stock (in shares) at Dec. 31, 2023         (5,220,363)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 189.7     189.7    
Issuance of common stock awards to employees (in shares)   121,775        
Surrender of common stock awards (in shares)         (36,691)  
Surrender of common stock awards (8.0)       $ (8.0)  
Share-based compensation expense 11.7   11.7      
Share-based compensation issued to directors (in shares)   4,186        
Share-based compensation issued to directors 0.6   0.6      
Dividends declared $ (75.1)     (75.1)    
Common stock repurchase, inclusive of excise tax obligation (in shares) (315,000)       (314,864)  
Common stock repurchase, inclusive of excise tax obligation $ (66.9)       $ (66.9)  
Other comprehensive loss, net of tax (5.9)         (5.9)
Ending balance (in shares) at Sep. 30, 2024   33,713,662        
Accumulated gain at end of period at Sep. 30, 2024 716.4 $ 0.3 257.0 808.4 $ (377.1) 27.8
Ending balance, treasury stock (in shares) at Sep. 30, 2024         (5,571,918)  
Beginning balance (in shares) at Jun. 30, 2024   33,706,380        
Accumulated gain at beginning of period at Jun. 30, 2024 685.3 $ 0.3 252.9 749.6 $ (355.9) 38.4
Beginning balance, treasury stock (in shares) at Jun. 30, 2024         (5,471,918)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 68.6     68.6    
Issuance of common stock awards to employees (in shares)   7,282        
Share-based compensation expense 3.9   3.9      
Share-based compensation issued to directors 0.2   0.2      
Dividends declared $ (9.8)     (9.8)    
Common stock repurchase, inclusive of excise tax obligation (in shares) (100,000)       (100,000)  
Common stock repurchase, inclusive of excise tax obligation $ (21.2)       $ (21.2)  
Other comprehensive loss, net of tax (10.6)         (10.6)
Ending balance (in shares) at Sep. 30, 2024   33,713,662        
Accumulated gain at end of period at Sep. 30, 2024 $ 716.4 $ 0.3 257.0 808.4 $ (377.1) 27.8
Ending balance, treasury stock (in shares) at Sep. 30, 2024         (5,571,918)  
Beginning balance (in shares) at Dec. 31, 2024 33,713,662 33,713,662        
Accumulated gain at beginning of period at Dec. 31, 2024 $ 705.3 $ 0.3 261.3 865.5 $ (456.8) 35.0
Beginning balance, treasury stock (in shares) at Dec. 31, 2024 (5,955,171)       (5,955,171)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 188.8     188.8    
Issuance of common stock awards to employees (in shares)   91,467        
Surrender of common stock awards (in shares)         (56,797)  
Surrender of common stock awards (9.1)       $ (9.1)  
Share-based compensation expense 14.7   14.7      
Share-based compensation issued to directors (in shares)   5,425        
Share-based compensation issued to directors 0.7   0.7      
Issuance of award previously classified as liability awards (in shares)   26,803        
Issuance of awards previously classified as liability awards 3.4   3.4      
Dividends declared $ (77.5)     (77.5)    
Common stock repurchase, inclusive of excise tax obligation (in shares) (700,000)       (700,000)  
Common stock repurchase, inclusive of excise tax obligation $ (136.1)       $ (136.1)  
Other comprehensive loss, net of tax $ (11.6)         (11.6)
Ending balance (in shares) at Sep. 30, 2025 33,837,357 33,837,357        
Accumulated gain at end of period at Sep. 30, 2025 $ 678.6 $ 0.3 280.1 976.8 $ (602.0) 23.4
Ending balance, treasury stock (in shares) at Sep. 30, 2025 (6,711,968)       (6,711,968)  
Beginning balance (in shares) at Jun. 30, 2025   33,835,259        
Accumulated gain at beginning of period at Jun. 30, 2025 $ 664.5 $ 0.3 275.4 912.5 $ (549.3) 25.6
Beginning balance, treasury stock (in shares) at Jun. 30, 2025         (6,508,388)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 74.4     74.4    
Issuance of common stock awards to employees (in shares)   2,098        
Surrender of common stock awards (in shares)         (3,580)  
Surrender of common stock awards (0.7)       $ (0.7)  
Share-based compensation expense 4.4   4.4      
Share-based compensation issued to directors 0.3   0.3      
Dividends declared $ (10.1)     (10.1)    
Common stock repurchase, inclusive of excise tax obligation (in shares) (200,000)       (200,000)  
Common stock repurchase, inclusive of excise tax obligation $ (52.0)       $ (52.0)  
Other comprehensive loss, net of tax $ (2.2)         (2.2)
Ending balance (in shares) at Sep. 30, 2025 33,837,357 33,837,357        
Accumulated gain at end of period at Sep. 30, 2025 $ 678.6 $ 0.3 $ 280.1 $ 976.8 $ (602.0) $ 23.4
Ending balance, treasury stock (in shares) at Sep. 30, 2025 (6,711,968)       (6,711,968)