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Fair Value Measurement (Tables)
 3 Months Ended
Dec. 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 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 December 31, 2014, September 30, 2014 and December 31, 2013:  
 
 
Asset (Liability)
 
 
Level 1
 
Level 2
 
Level 3
 
Total
December 31, 2014:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
14.1

 
$
26.1

 
$
—

 
$
40.2

Foreign currency contracts
 
$
—

 
$
18.7

 
$
—

 
$
18.7

Interest rate contracts
 
$
—

 
$
0.1

 
$
—

 
$
0.1

Cross-currency swaps
 
$
—

 
$
4.3

 
$
—

 
$
4.3

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(69.4
)
 
$
(228.5
)
 
$
—

 
$
(297.9
)
Interest rate contracts
 
$
—

 
$
(17.0
)
 
$
—

 
$
(17.0
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
31.4

 
$
—

 
$
—

 
$
31.4

September 30, 2014:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
10.6

 
$
19.8

 
$
—

 
$
30.4

Foreign currency contracts
 
$
—

 
$
12.8

 
$
—

 
$
12.8

Interest rate contracts
 
$
—

 
$
0.1

 
$
—

 
$
0.1

Cross-currency swaps
 
$
—

 
$
2.1

 
$
—

 
$
2.1

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(21.2
)
 
$
(32.9
)
 
$
—

 
$
(54.1
)
Foreign currency contracts
 
$
—

 
$
(0.1
)
 
$
—

 
$
(0.1
)
Interest rate contracts
 
$
—

 
$
(21.0
)
 
$
—

 
$
(21.0
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
30.0

 
$
—

 
$
—

 
$
30.0

December 31, 2013 (b):
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
9.8

 
$
49.6

 
$
—

 
$
59.4

Foreign currency contracts
 
$
—

 
$
0.4

 
$
—

 
$
0.4

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(6.1
)
 
$
(4.6
)
 
$
—

 
$
(10.7
)
Foreign currency contracts
 
$
—

 
$
(7.2
)
 
$
—

 
$
(7.2
)
Interest rate contracts
 
$
—

 
$
(29.2
)
 
$
—

 
$
(29.2
)
Cross-currency swaps
 
$
—

 
$
(2.1
)
 
$
—

 
$
(2.1
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
30.3

 
$
—

 
$
—

 
$
30.3



(a)
Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans.
(b)
Certain immaterial amounts have been revised to correct the classification of derivatives.