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Fair Value Measurement (Tables)
 9 Months Ended
Jun. 30, 2018
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, 2018, September 30, 2017 and June 30, 2017:  
 
 
Asset (Liability)
 
 
Level 1
 
Level 2
 
Level 3
 
Total
June 30, 2018:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
58.5

 
$
70.0

 
$
—

 
$
128.5

Foreign currency contracts
 
$
—

 
$
18.4

 
$
—

 
$
18.4

Cross-currency contracts
 
$
—

 
$
0.7

 
$
—

 
$
0.7

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(25.3
)
 
$
(8.9
)
 
$
—

 
$
(34.2
)
Foreign currency contracts
 
$
—

 
$
(17.9
)
 
$
—

 
$
(17.9
)
Interest rate contracts
 
$
—

 
$
(1.5
)
 
$
—

 
$
(1.5
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
38.4

 
$
—

 
$
—

 
$
38.4

September 30, 2017:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
27.2

 
$
76.9

 
$
—

 
$
104.1

Foreign currency contracts
 
$
—

 
$
12.2

 
$
—

 
$
12.2

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(27.7
)
 
$
(11.4
)
 
$
—

 
$
(39.1
)
Foreign currency contracts
 
$
—

 
$
(38.2
)
 
$
—

 
$
(38.2
)
Interest rate contracts
 
$
—

 
$
(2.3
)
 
$
—

 
$
(2.3
)
Cross-currency contracts
 
$
—

 
$
(2.9
)
 
$
—

 
$
(2.9
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
35.6

 
$
—

 
$
—

 
$
35.6

June 30, 2017:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
29.3

 
$
10.5

 
$
—

 
$
39.8

Foreign currency contracts
 
$
—

 
$
11.3

 
$
—

 
$
11.3

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(25.6
)
 
$
(17.3
)
 
$
—

 
$
(42.9
)
Foreign currency contracts
 
$
—

 
$
(24.3
)
 
$
—

 
$
(24.3
)
Interest rate contracts
 
$
—

 
$
(2.2
)
 
$
—

 
$
(2.2
)
Cross-currency contracts
 
$
—

 
$
(0.9
)
 
$
—

 
$
(0.9
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
35.8

 
$
—

 
$
—

 
$
35.8


(a)
Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans.
Schedule of Carrying Amount and Estimated Fair Value of Long-term Debt
The carrying amount and estimated fair value of our long-term debt (including current maturities but excluding unamortized debt issuance costs) at June 30, 2018, September 30, 2017 and June 30, 2017 were as follows:
 
June 30, 2018
 
September 30, 2017
 
June 30, 2017
Carrying amount
$
4,210.9

 
$
4,211.9

 
$
4,175.3

Estimated fair value
$
4,143.1

 
$
4,346.8

 
$
4,267.0