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Fair Value Measurement (Tables)
 12 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Abstract]  
Financial assets and financial liabilities that are measured at fair value on a recurring basis
The following table presents our financial assets and financial liabilities that are measured at fair value on a recurring basis for each of the fair value hierarchy levels, including both current and noncurrent portions, as of September 30, 2012 and 2011:

 
Asset (Liability)
 
Quoted Prices
in Active
Markets for
Identical Assets
and Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Unobservable
Inputs
(Level 3)
 
Total
September 30, 2012:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
8.6

 
$
4.5

 
$
—

 
$
13.1

Foreign currency contracts
$
—

 
$
1.8

 
$
—

 
$
1.8

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
(7.8
)
 
$
(53.2
)
 
$
—

 
$
(61.0
)
Interest rate contracts
$
—

 
$
(71.9
)
 
$
—

 
$
(71.9
)
 
 
 
 
 
 
 
 
September 30, 2011:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
3.5

 
$
3.3

 
$
—

 
$
6.8

Foreign currency contracts
$
—

 
$
5.3

 
$
—

 
$
5.3

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
(28.1
)
 
$
(16.1
)
 
$
—

 
$
(44.2
)
Foreign currency contracts
$
—

 
$
(3.3
)
 
$
—

 
$
(3.3
)
Interest rate contracts
$
—

 
$
(44.4
)
 
$
—

 
$
(44.4
)