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Financial Instruments (Narrative) (Details)
€ in Millions
12 Months Ended
Sep. 30, 2024
EUR (€)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
EUR (€)
Sep. 30, 2023
USD ($)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features   $ 47,300,000   $ 94,200,000
Collateral posted on liability positions with credit risk-related contingent features   0    
Collateral amount that counterparties would be required to post   $ 57,200,000   345,000,000.0
Forward exchange contracts | Cash flow hedges        
Derivative [Line Items]        
Maximum remaining maturity of foreign currency derivatives 2 years 6 months 2 years 6 months    
Foreign currency debt | Euro Denominated        
Derivative [Line Items]        
Notional amount included in designated foreign currency denominated debt € 1,905.7 $ 2,121,900,000 € 1,938.6 $ 2,049,700,000