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Fair Value Measurement (Tables)
 3 Months Ended
Dec. 31, 2017
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, 2017, September 30, 2017 and December 31, 2016:  
 
 
Asset (Liability)
 
 
Level 1
 
Level 2
 
Level 3
 
Total
December 31, 2017:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
47.9

 
$
71.7

 
$
—

 
$
119.6

Foreign currency contracts
 
$
—

 
$
11.6

 
$
—

 
$
11.6

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(31.0
)
 
$
(13.5
)
 
$
—

 
$
(44.5
)
Foreign currency contracts
 
$
—

 
$
(39.9
)
 
$
—

 
$
(39.9
)
Interest rate contracts
 
$
—

 
$
(2.1
)
 
$
—

 
$
(2.1
)
Cross-currency contracts
 
$
—

 
$
(0.9
)
 
$
—

 
$
(0.9
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
37.7

 
$
—

 
$
—

 
$
37.7

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

December 31, 2016:
 
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
62.7

 
$
61.8

 
$
—

 
$
124.5

Foreign currency contracts
 
$
—

 
$
26.0

 
$
—

 
$
26.0

Cross-currency contracts
 
$
—

 
$
3.5

 
$
—

 
$
3.5

Liabilities:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(53.1
)
 
$
(12.4
)
 
$
—

 
$
(65.5
)
Foreign currency contracts
 
$
—

 
$
(0.2
)
 
$
—

 
$
(0.2
)
Interest rate contracts
 
$
—

 
$
(2.8
)
 
$
—

 
$
(2.8
)
Non-qualified supplemental postretirement grantor trust investments (a)
 
$
34.2

 
$
—

 
$
—

 
$
34.2


(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 December 31, 2017, September 30, 2017 and December 31, 2016 were as follows:
 
December 31, 2017
 
September 30, 2017
 
December 31, 2016
Carrying amount
$
4,319.5

 
$
4,211.9

 
$
4,083.8

Estimated fair value
$
4,430.0

 
$
4,346.8

 
$
4,171.0