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Derivatives (Schedule Of Fair Value Of Outstanding Derivative Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets $ 9.5 $ 8.9
Derivative liabilities 2.3 0.8
Commodity Swaps [Member] | Accounts Payable [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 0.2 0.4
Interest Rate Swaps [Member] | Other Receivables [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets   1.8
Interest Rate Swaps [Member] | Deferred Charges And Other [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets   1.0
Interest Rate Swaps [Member] | Accrued Interest [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities   (0.3)
Foreign Exchange Contracts [Member] | Other Receivables [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 7.8 5.5
Foreign Exchange Contracts [Member] | Other Receivables [Member] | Not Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 1.2 0.4
Foreign Exchange Contracts [Member] | Deferred Charges And Other [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 0.5 0.2
Foreign Exchange Contracts [Member] | Accounts Payable [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 0.2 0.3
Foreign Exchange Contracts [Member] | Accounts Payable [Member] | Not Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 1.9 0.2
Foreign Exchange Contracts [Member] | Other Long-term Liabilities [Member] | Designated as Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities   $ 0.2