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Consolidated Statements of Shareholder's Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Shares
Additional Paid-in Capital
Retained Earnings (Deficit)
Treasury Shares
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2022 $ 686.5   $ 847.0 $ (123.1) $ (52.1) $ 14.7
Beginning balance (in shares) at Dec. 31, 2022   44,064,891        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 14.4     14.4    
Other comprehensive income (loss) (0.6)         (0.6)
Stock-based compensation expense 2.6   2.6      
Stock option activity 1.3   1.3      
Stock option activity (in shares)   101,130        
Purchase of treasury shares, including excise tax (9.4)       (9.4)  
Purchase of treasury shares, including excise tax (in Shares)   (514,086)        
Issuance of treasury shares     (11.4)   11.4  
Issuance of treasury shares (in shares)   555,062        
Shares surrendered for taxes (3.4)       (3.4)  
Shares surrendered for taxes (in shares)   (176,720)        
Ending balance at Mar. 31, 2023 691.4   839.5 (108.7) (53.5) 14.1
Ending balance (in shares) at Mar. 31, 2023   44,030,277        
Beginning balance at Dec. 31, 2022 686.5   847.0 (123.1) (52.1) 14.7
Beginning balance (in shares) at Dec. 31, 2022   44,064,891        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 68.1          
Other comprehensive income (loss) (3.0)          
Ending balance at Sep. 30, 2023 730.3   842.2 (55.0) (68.6) 11.7
Ending balance (in shares) at Sep. 30, 2023   43,248,998        
Beginning balance at Mar. 31, 2023 691.4   839.5 (108.7) (53.5) 14.1
Beginning balance (in shares) at Mar. 31, 2023   44,030,277        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 28.9     28.9    
Other comprehensive income (loss) (0.6)         (0.6)
Stock-based compensation expense 2.9   2.9      
Stock option activity 0.6   0.6      
Stock option activity (in shares)   76,030        
Purchase of treasury shares, including excise tax (11.4)       (11.4)  
Purchase of treasury shares, including excise tax (in Shares)   (650,271)        
Issuance of treasury shares     (1.8)   1.8  
Issuance of treasury shares (in shares)   29,356        
Ending balance at Jun. 30, 2023 711.8   841.2 (79.8) (63.1) 13.5
Ending balance (in shares) at Jun. 30, 2023   43,485,392        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 24.8     24.8    
Other comprehensive income (loss) (1.8)         (1.8)
Stock-based compensation expense 3.0   3.0      
Stock option activity 0.5   0.5      
Stock option activity (in shares)   61,075        
Purchase of treasury shares, including excise tax (8.0)   (0.3)   (7.7)  
Purchase of treasury shares, including excise tax (in Shares)   (352,860)        
Issuance of treasury shares     (2.2)   2.2  
Issuance of treasury shares (in shares)   56,131        
Shares surrendered for taxes (in shares)   (740)        
Ending balance at Sep. 30, 2023 730.3   842.2 (55.0) (68.6) 11.7
Ending balance (in shares) at Sep. 30, 2023   43,248,998        
Beginning balance at Dec. 31, 2023 731.6   844.2 (53.7) (71.3) 12.4
Beginning balance (in shares) at Dec. 31, 2023   43,136,311        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 24.0     24.0    
Other comprehensive income (loss) (1.1)         (1.1)
Stock-based compensation expense 3.5   3.5      
Stock option activity 1.1   1.1      
Stock option activity (in shares)   104,360        
Purchase of treasury shares, including excise tax (4.4)       (4.4)  
Purchase of treasury shares, including excise tax (in Shares)   (211,571)        
Issuance of treasury shares     (13.8)   13.8  
Issuance of treasury shares (in shares)   1,707,603        
Shares surrendered for taxes (15.4)       (15.4)  
Shares surrendered for taxes (in shares)   (739,352)        
Ending balance at Mar. 31, 2024 739.3   835.0 (29.7) (77.3) 11.3
Ending balance (in shares) at Mar. 31, 2024   43,997,621        
Beginning balance at Dec. 31, 2023 731.6   844.2 (53.7) (71.3) 12.4
Beginning balance (in shares) at Dec. 31, 2023   43,136,311        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 22.7          
Other comprehensive income (loss) (4.0)          
Ending balance at Sep. 30, 2024 712.7   840.4 (31.0) (105.1) 8.4
Ending balance (in shares) at Sep. 30, 2024   42,494,100        
Beginning balance at Mar. 31, 2024 739.3   835.0 (29.7) (77.3) 11.3
Beginning balance (in shares) at Mar. 31, 2024   43,997,621        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 4.6     4.6    
Other comprehensive income (loss) (1.7)         (1.7)
Stock-based compensation expense 3.5   3.5      
Stock option activity 0.2   0.2      
Stock option activity (in shares)   21,954        
Purchase of treasury shares, including excise tax (9.6)       (9.6)  
Purchase of treasury shares, including excise tax (in Shares)   (439,031)        
Issuance of treasury shares     (1.5)   1.5  
Issuance of treasury shares (in shares)   59,179        
Shares surrendered for taxes (in shares)   (3,518)        
Ending balance at Jun. 30, 2024 736.3   837.2 (25.1) (85.4) 9.6
Ending balance (in shares) at Jun. 30, 2024   43,636,205        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) (5.9)     (5.9)    
Other comprehensive income (loss) (1.2)         (1.2)
Stock-based compensation expense 3.5   3.5      
Stock option activity 0.1   0.1      
Stock option activity (in shares)   7,968        
Purchase of treasury shares, including excise tax (20.1)       (20.1)  
Purchase of treasury shares, including excise tax (in Shares)   (1,159,488)        
Issuance of treasury shares     (0.4)   0.4  
Issuance of treasury shares (in shares)   13,348        
Shares surrendered for taxes (in shares)   (3,933)        
Ending balance at Sep. 30, 2024 $ 712.7   $ 840.4 $ (31.0) $ (105.1) $ 8.4
Ending balance (in shares) at Sep. 30, 2024   42,494,100