Fair Value Measurement (Tables)

12 Months Ended

Sep. 30, 2017

Financial Assets and Liabilities 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 described in Note 2, as of September 30, 2017 and 2016:



	Asset (Liability)
	Level 1			Level 2			Level 3		Total
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	)
Cross-currency swaps	$	—		$	(2.9	)	$	—	$	(2.9	)
Interest rate contracts	$	—		$	(2.3	)	$	—	$	(2.3	)

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

September 30, 2016
Derivative instruments:
Assets:
Commodity contracts	$	28.9		$	26.0		$	—	$	54.9
Foreign currency contracts	$	—		$	17.8		$	—	$	17.8
Liabilities:
Commodity contracts	$	(76.8	)	$	(21.8	)	$	—	$	(98.6	)
Foreign currency contracts	$	—		$	(2.4	)	$	—	$	(2.4	)
Interest rate contracts	$	—		$	(3.9	)	$	—	$	(3.9	)
Cross-currency swaps	$	—		$	(0.5	)	$	—	$	(0.5	)

Non-qualified supplemental postretirement grantor trust investments (a)	$	33.0		$	—		$	—	$	33.0


(a)	Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans (see Note 7).

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 September 30, 2017 and 2016 were as follows:



	2017		2016
Carrying amount	$	4,211.9	$	3,832.3
Estimated fair value	$	4,346.8	$	4,052.3