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Financial Instruments (Narrative) (Details)
€ in Millions
9 Months Ended 12 Months Ended
Jun. 30, 2022
EUR (€)
Jun. 30, 2022
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2021
USD ($)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features   $ 86,900,000   $ 53,400,000
Collateral posted on liability positions with credit risk-related contingent features   0    
Collateral amount that counterparties would be required to post   $ 68,300,000   38,100,000
Forward exchange contracts | Cash Flow Hedges        
Derivative [Line Items]        
Maximum remaining maturity of foreign currency derivatives 4 years 4 years    
Foreign currency debt | Euro Denominated        
Derivative [Line Items]        
Notional amount included in designated foreign currency denominated debt € 1,278.1 $ 1,339,600,000 € 1,297.5 $ 1,502,600,000