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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Shares
Capital in Excess of Stated Value
Retained Earnings
Treasury Shares
Accumulated Other Comprehensive Income (Loss)
Equity beginning balance (in shares) at Sep. 30, 2022   68.1        
Equity beginning balance at Sep. 30, 2022   $ 0.3 $ 363.7 $ 1,020.1 $ (1,091.8) $ (144.6)
Treasury shares, beginning balance (in shares) at Sep. 30, 2022         12.8  
Total equity, beginning balance at Sep. 30, 2022 $ 147.7          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (380.1)     (380.1)    
Other comprehensive income (loss) 31.8         31.8
Share-based compensation 68.1   68.1      
Dividends declared (149.1)     (149.1)    
Treasury share purchases (in shares)         0.1  
Treasury share purchases (9.3)       $ (9.3)  
Treasury share issuances (in shares)         (1.3)  
Treasury share issuances 23.7   (78.9)   $ 102.6  
Equity ending balance (in shares) at Sep. 30, 2023   68.1        
Equity ending balance at Sep. 30, 2023   $ 0.3 352.8 490.9 $ (998.5) (112.8)
Treasury shares, ending balance (in shares) at Sep. 30, 2023         11.6  
Total equity, ending balance at Sep. 30, 2023 (267.3)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (34.9)     (34.9)    
Other comprehensive income (loss) 5.5         5.5
Share-based compensation 38.9   38.9      
Dividends declared (152.2)     (152.2)    
Treasury share purchases (in shares)         0.1  
Treasury share purchases (5.1)       $ (5.1)  
Treasury share issuances (in shares)         (0.7)  
Treasury share issuances $ 24.5   (30.0)   $ 54.5  
Equity ending balance (in shares) at Sep. 30, 2024   68.1        
Equity ending balance at Sep. 30, 2024   $ 0.3 361.7 303.8 $ (949.1) (107.3)
Treasury shares, ending balance (in shares) at Sep. 30, 2024 11.0       11.0  
Total equity, ending balance at Sep. 30, 2024 $ (390.6)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 145.2     145.2    
Other comprehensive income (loss) (2.4)         (2.4)
Share-based compensation 50.6   50.6      
Dividends declared (154.3)     (154.3)    
Treasury share purchases (in shares)         0.2  
Treasury share purchases (18.4)       $ (18.4)  
Treasury share issuances (in shares)         (0.8)  
Treasury share issuances $ 12.4   (61.0)   $ 73.4  
Equity ending balance (in shares) at Sep. 30, 2025   68.1        
Equity ending balance at Sep. 30, 2025   $ 0.3 $ 351.3 $ 294.7 $ (894.1) $ (109.7)
Treasury shares, ending balance (in shares) at Sep. 30, 2025 10.4       10.4  
Total equity, ending balance at Sep. 30, 2025 $ (357.5)