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Taxes on Income - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Examination [Line Items]      
Net operating loss and state credit carry-forwards $ 328.3 $ 325.8  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 111.2 132.8 $ 132.2
Foreign tax credit carry-forwards 70.4 81.6  
Increase (decrease) in valuation allowance 6.6    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 111.2 132.8 $ 132.2
Accrued interest on uncertain tax positions 25.8 23.7  
Accrued penalties on uncertain tax positions 1.7 $ 1.6  
Estimated decrease in unrecognized tax benefits within the next twelve months 12.0    
Transition Tax, Liability, to be Paid, Year One 231.6    
Domestic Tax Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Net operating loss and state credit carry-forwards 9.5    
Foreign Tax Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Net operating loss and state credit carry-forwards 121.4    
State [Member]      
Income Tax Examination [Line Items]      
Net operating loss and state credit carry-forwards $ 118.3