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Fair Value Measurement (Tables)
 6 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Financial Assets and Financial Liabilities that are Measured at Fair Value on a Recurring Basis
The following table presents on a gross basis our financial assets and liabilities including both current and noncurrent portions, that are measured at fair value on a recurring basis within the fair value hierarchy, as of March 31, 2016, September 30, 2015 and March 31, 2015:  
 
 
Asset (Liability)
 
 
Level 1
 
Level 2
 
Level 3
 
Total
March 31, 2016:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
20.3

 
$
16.7

 
$
—

 
$
37.0

Foreign currency contracts
 
$
—

 
$
11.6

 
$
—

 
$
11.6

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(59.0
)
 
$
(48.4
)
 
$
—

 
$
(107.4
)
Foreign currency contracts
 
$
—

 
$
(5.0
)
 
$
—

 
$
(5.0
)
Interest rate contracts
 
$
—

 
$
(3.4
)
 
$
—

 
$
(3.4
)
Cross-currency swaps
 
$
—

 
$
(1.3
)
 
$
—

 
$
(1.3
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
31.8

 
$
—

 
$
—

 
$
31.8

September 30, 2015:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
17.4

 
$
11.6

 
$
—

 
$
29.0

Foreign currency contracts
 
$
—

 
$
29.1

 
$
—

 
$
29.1

Cross-currency swaps
 
$
—

 
$
0.4

 
$
—

 
$
0.4

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(70.0
)
 
$
(99.0
)
 
$
—

 
$
(169.0
)
Foreign currency contracts
 
$
—

 
$
(0.1
)
 
$
—

 
$
(0.1
)
Interest rate contracts
 
$
—

 
$
(10.8
)
 
$
—

 
$
(10.8
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
30.3

 
$
—

 
$
—

 
$
30.3

March 31, 2015:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
13.9

 
$
8.3

 
$
—

 
$
22.2

Foreign currency contracts
 
$
—

 
$
35.8

 
$
—

 
$
35.8

Interest rate contracts
 
$
—

 
$
0.1

 
$
—

 
$
0.1

Cross-currency swaps
 
$
—

 
$
9.7

 
$
—

 
$
9.7

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(64.0
)
 
$
(104.3
)
 
$
—

 
$
(168.3
)
Interest rate contracts
 
$
—

 
$
(12.5
)
 
$
—

 
$
(12.5
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
31.8

 
$
—

 
$
—

 
$
31.8



(a)
Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans.