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Condensed 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, 2023 $ 1,379.1 $ 0.5 $ (69.3) $ 371.6 $ 1,128.1 $ (51.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 122.2       122.2  
Other comprehensive gain (loss), net of tax 22.2         22.2
Exercise of stock options 3.5     3.5    
Shares withheld to cover taxes on vesting of equity awards (1.2)     (1.2)    
Share-based compensation 16.8     16.8    
Ending balance at Mar. 31, 2024 1,542.6 0.5 (69.3) 390.7 1,250.3 (29.6)
Beginning balance at Dec. 31, 2023 1,482.8 0.5 (69.3) 378.6 1,197.2 (24.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 53.1       53.1  
Other comprehensive gain (loss), net of tax (5.4)         (5.4)
Exercise of stock options 3.0     3.0    
Shares withheld to cover taxes on vesting of equity awards (0.1)     (0.1)    
Share-based compensation 9.2     9.2    
Ending balance at Mar. 31, 2024 1,542.6 0.5 (69.3) 390.7 1,250.3 (29.6)
Beginning balance at Sep. 30, 2024 1,709.1 0.5 (69.3) 414.2 1,388.9 (25.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 156.8       156.8  
Other comprehensive gain (loss), net of tax (6.6)         (6.6)
Exercise of stock options 4.8     4.8    
Shares withheld to cover taxes on vesting of equity awards (4.1)     (4.1)    
Share-based compensation 22.0     22.0    
Ending balance at Mar. 31, 2025 1,882.0 0.5 (69.3) 436.9 1,545.7 (31.8)
Beginning balance at Dec. 31, 2024 1,777.4 0.5 (69.3) 422.6 1,474.0 (50.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 71.7       71.7  
Other comprehensive gain (loss), net of tax 18.6         18.6
Exercise of stock options 4.0     4.0    
Shares withheld to cover taxes on vesting of equity awards (0.4)     (0.4)    
Share-based compensation 10.7     10.7    
Ending balance at Mar. 31, 2025 $ 1,882.0 $ 0.5 $ (69.3) $ 436.9 $ 1,545.7 $ (31.8)