|
Derivative Financial Instruments and Hedging Gain(Loss) recognized in earnings from derivative instruments (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Sep. 30, 2012
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Sep. 30, 2011
|
Sep. 30, 2010
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ (2.0) | $ (13.6) | $ (0.9) |
|
Participation in Ralcorp derivative program costs [Member] | Cost of Sales [Member]
|
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | (2.0) | (13.6) | (0.9) |
|
Commodity Contract [Member] | Cost of Sales [Member]
|
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | 0 | 0 | 0 |
|
Future [Member] | Cost of Sales [Member]
|
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| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 0.3 | $ 0 | $ 0 |