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Fair Value Measurement (Tables)
 6 Months Ended
Mar. 31, 2014
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 March 31, 2014, September 30, 2013 and March 31, 2013:
 
 
 
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
March 31, 2014:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
11.5

 
$
11.4

 
$
—

 
$
22.9

Foreign currency contracts
 
$
—

 
$
0.1

 
$
—

 
$
0.1

Liabilities:
 
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(4.0
)
 
$
(17.1
)
 
$
—

 
$
(21.1
)
Foreign currency contracts
 
$
—

 
$
(5.6
)
 
$
—

 
$
(5.6
)
Interest rate contracts
 
$
—

 
$
(27.8
)
 
$
—

 
$
(27.8
)
Cross-currency swaps
 
$
—

 
$
(2.2
)
 
$
—

 
$
(2.2
)
September 30, 2013:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
2.1

 
$
21.2

 
$
—

 
$
23.3

Foreign currency contracts
 
$
—

 
$
0.9

 
$
—

 
$
0.9

Liabilities:
 
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(9.7
)
 
$
(6.3
)
 
$
—

 
$
(16.0
)
Foreign currency contracts
 
$
—

 
$
(7.2
)
 
$
—

 
$
(7.2
)
Interest rate contracts
 
$
—

 
$
(31.0
)
 
$
—

 
$
(31.0
)
Cross-currency swaps
 
$
—

 
$
(1.2
)
 
$
—

 
$
(1.2
)
March 31, 2013:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
7.9

 
$
5.7

 
$
—

 
$
13.6

Foreign currency contracts
 
$
—

 
$
1.5

 
$
—

 
$
1.5

Interest rate contracts
 
$
—

 
$
4.2

 
$
—

 
$
4.2

Liabilities:
 
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(2.7
)
 
$
(12.6
)
 
$
—

 
$
(15.3
)
Foreign currency contracts
 
$
—

 
$
(0.5
)
 
$
—

 
$
(0.5
)
Interest rate contracts
 
$
—

 
$
(60.5
)
 
$
—

 
$
(60.5
)
Offsetting Derivative Assets and Liabilities
Cash collateral paid by us to our derivative counterparties is reflected in the table below to offset derivative liabilities. Cash collateral received by us from our derivative counterparties is reflected in the table below to offset derivative assets. Certain other accounts receivable and accounts payable balances recognized on our Condensed Consolidated Balance Sheets with our derivative counterparties are not included in the table below but could reduce our net exposure to such counterparties because such balances are subject to master netting or similar arrangements.
Offsetting Derivative Assets and Liabilities
 
 
 
 
 
Gross Amounts Recognized
Gross Amounts Offset in the Balance Sheet
Net Amounts Presented in the Balance Sheet
March 31, 2014:
 
 
 
Derivative assets
$
31.6

$
(8.6
)
$
23.0

Derivative (liabilities)
$
(65.3
)
$
8.6

$
(56.7
)
 
 
 
 
September 30, 2013:
 
 
 
Derivative assets
$
26.3

$
(2.1
)
$
24.2

Derivative (liabilities)
$
(57.5
)
$
2.1

$
(55.4
)
 
 
 
 
March 31, 2013:
 
 
 
Derivative assets
$
30.1

$
(10.8
)
$
19.3

Derivative (liabilities)
$
(87.1
)
$
10.8

$
(76.3
)