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Financial Instruments (Narrative) (Details)
€ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features $ 29,900,000   $ 30,100,000  
Collateral posted on liability positions with credit risk-related contingent features 0      
Collateral amount that counterparties would be required to post $ 128,200,000   157,100,000  
Forward Exchange Contracts | Cash Flow Hedges        
Derivative [Line Items]        
Maximum remaining maturity of foreign currency derivatives 1 year 10 months 24 days 1 year 10 months 24 days    
Foreign Currency Debt | Euro Denominated        
Derivative [Line Items]        
Notional amount included in designated foreign currency denominated debt $ 1,068,800,000 € 953.2 $ 1,036,900,000 € 951.3