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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2020
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:
 
 
Asset (Liability)
 
 
Level 1
 
Level 2
 
Level 3
 
Total
March 31, 2020:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
36.4

 
$
11.9

 
$
—

 
$
48.3

Foreign currency contracts
 
$
—

 
$
58.0

 
$
—

 
$
58.0

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(92.2
)
 
$
(221.6
)
 
$
—

 
$
(313.8
)
Foreign currency contracts
 
$
—

 
$
(6.8
)
 
$
—

 
$
(6.8
)
Interest rate contracts
 
$
—

 
$
(54.1
)
 
$
—

 
$
(54.1
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
38.6

 
$
—

 
$
—

 
$
38.6

September 30, 2019:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
32.0

 
$
10.1

 
$
—

 
$
42.1

Foreign currency contracts
 
$
—

 
$
59.0

 
$
—

 
$
59.0

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(62.3
)
 
$
(112.7
)
 
$
—

 
$
(175.0
)
Foreign currency contracts
 
$
—

 
$
(4.3
)
 
$
—

 
$
(4.3
)
Interest rate contracts
 
$
—

 
$
(12.3
)
 
$
—

 
$
(12.3
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
39.7

 
$
—

 
$
—

 
$
39.7

March 31, 2019:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
33.3

 
$
27.7

 
$
—

 
$
61.0

Foreign currency contracts
 
$
—

 
$
29.8

 
$
—

 
$
29.8

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(17.0
)
 
$
(55.7
)
 
$
—

 
$
(72.7
)
Foreign currency contracts
 
$
—

 
$
(4.9
)
 
$
—

 
$
(4.9
)
Interest rate contracts
 
$
—

 
$
(5.7
)
 
$
—

 
$
(5.7
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
40.2

 
$
—

 
$
—

 
$
40.2


(a)
Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans (see Note 12)
Schedule of Carrying Amount and Estimated Fair Value of Long-term Debt The carrying amounts and estimated fair values of our long-term debt (including current maturities but excluding unamortized debt issuance costs) were as follows:
 
March 31, 2020
 
September 30, 2019
 
March 31, 2019
Carrying amount
$
5,878.6

 
$
5,856.6

 
$
4,341.2

Estimated fair value
$
5,735.7

 
$
6,189.3

 
$
4,380.4