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Financial Instruments (Narrative) (Details)
€ in Millions
3 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Sep. 30, 2017
USD ($)
Derivative [Line Items]          
Cash flow hedges net losses expected to be reclassified in next twelve months $ (14,000,000)        
Net liability position of derivatives with credit risk-related contingent features 78,700,000       $ 34,600,000
Collateral posted on liability positions with credit risk-related contingent features 0        
Collateral amount that counterparties would be required to post $ 100,600,000       $ 138,500,000
Forward Exchange Contracts | Cash Flow Hedges          
Derivative [Line Items]          
Maximum remaining maturity of foreign currency derivatives 1 year 6 months 1 year 6 months      
Foreign Currency Debt | Euro Denominated          
Derivative [Line Items]          
Notional amount included in designated foreign currency denominated debt $ 1,091,200,000 € 909.0 $ 1,077,700,000 € 912.2