Fair Value Measurements

9 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 11 — Fair Value Measurements

Recurring Fair Value Measurements

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, 2016, September 30, 2015 and June 30, 2015:

	Asset (Liability)
	Level 1			Level 2			Level 3		Total
June 30, 2016:
Derivative instruments:
Assets:
Commodity contracts	$	39.9		$	30.3		$	—	$	70.2
Foreign currency contracts	$	—		$	18.6		$	—	$	18.6
Cross-currency swaps	$	—		$	0.3		$	—	$	0.3
Liabilities:
Commodity contracts	$	(47.1	)	$	(24.3	)	$	—	$	(71.4	)
Foreign currency contracts	$	—		$	(0.8	)	$	—	$	(0.8	)
Interest rate contracts	$	—		$	(3.8	)	$	—	$	(3.8	)
Non-qualified supplemental postretirement grantor trust investments (a)	$	32.0		$	—		$	—	$	32.0
September 30, 2015:
Derivative instruments:
Assets:
Commodity contracts	$	17.4		$	11.6		$	—	$	29.0
Foreign currency contracts	$	—		$	29.1		$	—	$	29.1
Cross-currency swaps	$	—		$	0.4		$	—	$	0.4
Liabilities:
Commodity contracts	$	(70.0	)	$	(99.0	)	$	—	$	(169.0	)
Foreign currency contracts	$	—		$	(0.1	)	$	—	$	(0.1	)
Interest rate contracts	$	—		$	(10.8	)	$	—	$	(10.8	)
Non-qualified supplemental postretirement grantor trust investments (a)	$	30.3		$	—		$	—	$	30.3
June 30, 2015:
Derivative instruments:
Assets:
Commodity contracts	$	13.6		$	8.2		$	—	$	21.8
Foreign currency contracts	$	—		$	29.1		$	—	$	29.1
Interest rate contracts	$	—		$	1.0		$	—	$	1.0
Cross-currency swaps	$	—		$	8.2		$	—	$	8.2
Liabilities:
Commodity contracts	$	(58.6	)	$	(94.0	)	$	—	$	(152.6	)
Foreign currency contracts	$	—		$	(0.1	)	$	—	$	(0.1	)
Interest rate contracts	$	—		$	(2.0	)	$	—	$	(2.0	)
Non-qualified supplemental postretirement grantor trust investments (a)	$	31.8		$	—		$	—	$	31.8

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

The fair values of our Level 1 exchange-traded commodity futures and option contracts and non-exchange-traded commodity futures and forward contracts are based upon actively quoted market prices for identical assets and liabilities. The remainder of our derivative instruments are designated as Level 2. The fair values of certain non-exchange traded commodity derivatives designated as Level 2 are based upon indicative price quotations available through brokers, industry price publications or recent market transactions and related market indicators. For commodity option contracts designated as Level 2 that are not traded on an exchange, we use a Black Scholes option pricing model that considers time value and volatility of the underlying commodity. The fair values of our Level 2 interest rate contracts, foreign currency contracts and cross-currency contracts are based upon third-party quotes or indicative values based on recent market transactions. The fair values of investments held in grantor trusts are derived from quoted market prices as substantially all of the investments in these trusts have active markets. There were no transfers between Level 1 and Level 2 during the periods presented.

Other Financial Instruments

The carrying amounts of other financial instruments included in current assets and current liabilities (except for current maturities of long-term debt) approximate their fair values because of their short-term nature. At June 30, 2016, the carrying amount and estimated fair value of our long-term debt (including current maturities) were $4,156.9 and $4,312.0, respectively. At June 30, 2015, the carrying amount and estimated fair value of our long-term debt (including current maturities) were $3,711.6 and $3,887.0, respectively. We estimate the fair value of long-term debt by using current market rates and by discounting future cash flows using rates available for similar type debt (Level 2).

Financial instruments other than derivative instruments, such as short-term investments and trade accounts receivable, could expose us to concentrations of credit risk. We limit credit risk from short-term investments by investing only in investment-grade commercial paper, money market mutual funds, securities guaranteed by the U.S. Government or its agencies and FDIC insured bank deposits. The credit risk arising from concentrations of trade accounts receivable is limited because we have a large customer base that extends across many different U.S. markets and a number of foreign countries. For information regarding concentrations of credit risk associated with our derivative instruments, see Note 12. Our investment in a private equity partnership is measured at fair value on a non-recurring basis. Generally this measurement uses Level 3 fair value inputs because the investment does not have a readily available market value.