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Financial Instruments (Narrative) (Details)
€ in Millions
9 Months Ended 12 Months Ended
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2020
USD ($)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features   $ 81,000,000.0   $ 30,000,000.0
Collateral posted on liability positions with credit risk-related contingent features   0    
Collateral amount that counterparties would be required to post   $ 20,800,000   76,500,000
Forward exchange contracts | Cash Flow Hedges        
Derivative [Line Items]        
Maximum remaining maturity of foreign currency derivatives 2 years 1 month 6 days 2 years 1 month 6 days    
Foreign currency debt | Euro Denominated        
Derivative [Line Items]        
Notional amount included in designated foreign currency denominated debt € 1,302.2 $ 1,544,200,000 € 1,288.7 $ 1,510,800,000