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Financial Instruments (Narrative) (Details)
€ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
EUR (€)
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Derivative [Line Items]          
Net liability position of derivatives with credit risk-related contingent features   $ 105,000,000.0     $ 114,800,000
Collateral posted on liability positions with credit risk-related contingent features   0      
Collateral amount that counterparties would be required to post   $ 36,300,000     $ 62,800,000
Forward exchange contracts | Cash flow hedges          
Derivative [Line Items]          
Maximum remaining maturity of foreign currency derivatives 3 years 6 months 3 years 6 months      
Foreign currency debt | Euro Denominated          
Derivative [Line Items]          
Notional amount included in designated foreign currency denominated debt € 1,280.5 $ 1,370,700,000 € 1,265.4 $ 1,240,400,000