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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)
Parent
Non-controlling Interest
Equity beginning balance (in shares) at Sep. 30, 2020   68.1            
Equity beginning balance at Sep. 30, 2020   $ 0.3 $ 482.2 $ 1,235.6 $ (921.8) $ (99.1) $ 697.2  
Treasury shares, beginning balance (in shares) at Sep. 30, 2020         12.4      
Noncontrolling interest, beginning balance at Sep. 30, 2020               $ 5.7
Total equity, beginning balance at Sep. 30, 2020 $ 702.9              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) 513.4     512.5     512.5 0.9
Other comprehensive income (loss) 32.8         32.8 32.8  
Share-based compensation 40.6   40.6       40.6  
Dividends declared (143.0)     (143.0)     (143.0)  
Treasury share purchases (in shares)         0.7      
Treasury share purchases (129.3)       $ (129.3)   (129.3)  
Treasury share issuances (in shares)         (0.5)      
Treasury share issuances 16.1   (32.6)   $ 48.7   16.1  
Equity ending balance (in shares) at Sep. 30, 2021   68.1            
Equity ending balance at Sep. 30, 2021   $ 0.3 476.7 1,605.1 $ (1,002.4) (66.4) 1,013.3  
Treasury shares, ending balance (in shares) at Sep. 30, 2021         12.6      
Noncontrolling interest, ending balance at Sep. 30, 2021               0.0
Total equity, ending balance at Sep. 30, 2021 1,013.3              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Acquisition of remaining noncontrolling interest in Gavita (20.1)   (13.4)       (13.4) (6.7)
Net income (loss) (437.5)     (437.5)     (437.5)  
Other comprehensive income (loss) (78.2)         (78.2) (78.2)  
Share-based compensation 30.3   30.3       30.3  
Dividends declared (147.5)     (147.5)     (147.5)  
Treasury share purchases (in shares)         1.7      
Treasury share purchases (257.9)       $ (257.9)   (257.9)  
Treasury share issuances (in shares)         (1.5)      
Treasury share issuances 25.1   (143.3)   $ 168.4   25.1  
Equity ending balance (in shares) at Sep. 30, 2022   68.1            
Equity ending balance at Sep. 30, 2022   $ 0.3 363.7 1,020.1 $ (1,091.8) (144.6) 147.7  
Treasury shares, ending balance (in shares) at Sep. 30, 2022         12.8      
Noncontrolling interest, ending balance at Sep. 30, 2022               0.0
Total equity, ending balance at Sep. 30, 2022 147.7              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income (loss) (380.1)     (380.1)     (380.1) 0.0
Other comprehensive income (loss) 31.8         31.8 31.8  
Share-based compensation 68.1   68.1       68.1  
Dividends declared (149.1)     (149.1)     (149.1)  
Treasury share purchases (in shares)         0.1      
Treasury share purchases (9.3)       $ (9.3)   (9.3)  
Treasury share issuances (in shares)         (1.3)      
Treasury share issuances 23.7   (78.9)   $ 102.6   23.7  
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) $ (267.3)  
Treasury shares, ending balance (in shares) at Sep. 30, 2023         11.6      
Noncontrolling interest, ending balance at Sep. 30, 2023               $ 0.0
Total equity, ending balance at Sep. 30, 2023 $ (267.3)