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Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Common Stock
Treasury Stock
APIC
Retained Earnings
AOCI
Beginning balance (in shares) at Dec. 31, 2023   46,767,164        
Beginning balance at Dec. 31, 2023 $ 828.9 $ 0.5 $ (2,957.8) $ 508.1 $ 3,278.1 $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 66.0       66.0  
Cash dividends declared (8.8)       (8.8)  
Dividend equivalent units accrued 0.0     0.1 (0.1)  
Purchase of treasury stock (86.9)   (86.9)      
Issuance of treasury stock (0.1)   11.0 (11.1)    
Amounts related to share-based compensation (23.1)     (23.1)    
Share-based compensation expense 5.6     5.6    
Ending balance (in shares) at Mar. 31, 2024   46,767,164        
Ending balance at Mar. 31, 2024 $ 781.6 $ 0.5 (3,033.7) 479.6 3,335.2 0.0
Beginning balance (in shares) at Dec. 31, 2024 46,767,164 46,767,164        
Beginning balance at Dec. 31, 2024 $ 840.1 $ 0.5 (3,391.3) 487.5 3,743.4 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 53.2       53.2  
Cash dividends declared (9.8)       (9.8)  
Dividend equivalent units accrued 0.0     0.1 (0.1)  
Purchase of treasury stock (151.2)   (151.2)      
Issuance of treasury stock 0.0   8.4 (8.4)    
Amounts related to share-based compensation (18.6)     (18.6)    
Share-based compensation expense $ 5.9     5.9    
Ending balance (in shares) at Mar. 31, 2025 46,767,164 46,767,164        
Ending balance at Mar. 31, 2025 $ 719.6 $ 0.5 $ (3,534.1) $ 466.5 $ 3,786.7 $ 0.0