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Financial Instruments (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
EUR (€)
Mar. 31, 2016
USD ($)
Sep. 30, 2015
EUR (€)
Sep. 30, 2015
USD ($)
Derivative [Line Items]        
Net liability position of derivatives with credit risk-related contingent features   $ 7.9   $ 0.2
Collateral posted on liability positions with credit risk-related contingent features   0.0    
Collateral amount that counterparties would be required to post   267.0   226.9
Foreign Currency Debt [Member] | Euro Denominated Member [Member]        
Derivative [Line Items]        
Notional Amount included in designated foreign currency denominated debt € 543.8 $ 618.9 € 687.7 $ 768.4
Forward Exchange Contracts [Member]        
Derivative [Line Items]        
Maximum Remaining Maturity of Foreign Currency Derivatives 2 years 8 months 2 years 8 months