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Consolidated Statements of Stockholders’ Equity - USD ($)
$ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss, net
Beginning balance at Sep. 30, 2021 $ 904.0 $ 0.4 $ (69.3) $ 315.5 $ 682.5 $ (25.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 207.1       207.1  
Other comprehensive income (loss) (65.5)         (65.5)
Exercise of stock options 6.7     6.7    
Share-based compensation 17.8     17.8    
Ending balance at Sep. 30, 2022 1,070.1 0.4 (69.3) 340.0 889.6 (90.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 238.5       238.5  
Other comprehensive income (loss) 38.8         38.8
Exercise of stock options 3.7     3.7    
Share-based compensation 28.0     28.0    
Ending balance at Sep. 30, 2023 1,379.1 0.4 (69.3) 371.7 1,128.1 (51.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 260.8       260.8  
Other comprehensive income (loss) 26.6         26.6
Exercise of stock options 7.7     7.7    
Shares withheld to cover taxes on vesting of equity awards (2.3)     (2.3)    
Share-based compensation 37.2     37.2    
Ending balance at Sep. 30, 2024 $ 1,709.1 $ 0.4 $ (69.3) $ 414.3 $ 1,388.9 $ (25.2)