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Fair Value Measurement (Tables)
 9 Months Ended
Jun. 30, 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 June 30, 2016, September 30, 2015 and June 30, 2015:  
 
 
Asset (Liability)
 
 
Level 1
 
Level 2
 
Level 3
 
Total
June 30, 2016:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
39.9

 
$
30.3

 
$
—

 
$
70.2

Foreign currency contracts
 
$
—

 
$
18.6

 
$
—

 
$
18.6

Cross-currency swaps
 
$
—

 
$
0.3

 
$
—

 
$
0.3

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(47.1
)
 
$
(24.3
)
 
$
—

 
$
(71.4
)
Foreign currency contracts
 
$
—

 
$
(0.8
)
 
$
—

 
$
(0.8
)
Interest rate contracts
 
$
—

 
$
(3.8
)
 
$
—

 
$
(3.8
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
32.0

 
$
—

 
$
—

 
$
32.0

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

June 30, 2015:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
13.6

 
$
8.2

 
$
—

 
$
21.8

Foreign currency contracts
 
$
—

 
$
29.1

 
$
—

 
$
29.1

Interest rate contracts
 
$
—

 
$
1.0

 
$
—

 
$
1.0

Cross-currency swaps
 
$
—

 
$
8.2

 
$
—

 
$
8.2

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(58.6
)
 
$
(94.0
)
 
$
—

 
$
(152.6
)
Foreign currency contracts
 
$
—

 
$
(0.1
)
 
$
—

 
$
(0.1
)
Interest rate contracts
 
$
—

 
$
(2.0
)
 
$
—

 
$
(2.0
)
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.