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Financial Instruments (Narrative) (Details)
€ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2021
USD ($)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features   $ 71,500,000   $ 53,400,000
Collateral posted on liability positions with credit risk-related contingent features   0    
Collateral amount that counterparties would be required to post   $ 48,000,000.0   38,100,000
Forward exchange contracts | Cash Flow Hedges        
Derivative [Line Items]        
Maximum remaining maturity of foreign currency derivatives 3 years 8 months 12 days 3 years 8 months 12 days    
Foreign currency debt | Euro Denominated        
Derivative [Line Items]        
Notional amount included in designated foreign currency denominated debt € 1,306.9 $ 1,485,900,000 € 1,297.5 $ 1,502,600,000