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Financial Instruments (Narrative) (Details)
€ in Millions
9 Months Ended
Jun. 30, 2026
EUR (€)
Jun. 30, 2026
USD ($)
Sep. 30, 2025
EUR (€)
Sep. 30, 2025
USD ($)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features   $ 119,800,000   $ 43,300,000
Collateral posted on liability positions with credit risk-related contingent features   0    
Collateral amount that counterparties would be required to post   282,300,000   174,000,000.0
Forward exchange contracts | Cash flow hedges        
Derivative [Line Items]        
Maximum remaining maturity of foreign currency derivatives 2 years 2 months 12 days      
Foreign currency debt | Euro Denominated        
Derivative [Line Items]        
Notional amount included in designated foreign currency denominated debt € 3,117.2 $ 3,560,400,000 € 3,188.1 $ 3,741,500,000