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Financial Instruments (Narrative) (Details)
€ in Millions
6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2023
EUR (€)
Mar. 31, 2023
USD ($)
Jun. 30, 2022
EUR (€)
Sep. 30, 2022
USD ($)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features   $ 111,500,000   $ 114,800,000
Collateral posted on liability positions with credit risk-related contingent features   0    
Collateral amount that counterparties would be required to post   $ 37,300,000   62,800,000
Forward exchange contracts | Cash flow hedges        
Derivative [Line Items]        
Maximum remaining maturity of foreign currency derivatives 3 years 2 months 12 days 3 years 2 months 12 days    
Foreign currency debt | Euro Denominated        
Derivative [Line Items]        
Notional amount included in designated foreign currency denominated debt € 1,979.9 $ 2,146,100,000 € 1,265.4 $ 1,240,400,000