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Acquisitions and Divestitures (Sale of Business) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Disclosures by Disposal Group [Line Items]            
Gain on sale of business   $ 67.3 $ 0.0 $ 67.3 $ 0.0  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Singapore Subsidiary            
Disclosures by Disposal Group [Line Items]            
Proceeds from divestiture of businesses   104.3        
Gain on sale of business   67.3        
Gain (loss) on sale of business, net of tax   $ 51.9        
Approximate annual sales contributed by disposal group prior to disposition $ 50.0          
Singapore Subsidiary            
Disclosures by Disposal Group [Line Items]            
Subsidiary, ownership percentage           100.00%