Fair Value Measurement (Tables)

9 Months Ended

Jun. 30, 2015

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, 2015, September 30, 2014 and June 30, 2014:

	Asset (Liability)
	Level 1			Level 2			Level 3		Total
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
September 30, 2014:
Derivative instruments:
Assets:
Commodity contracts	$	10.6		$	19.8		$	—	$	30.4
Foreign currency contracts	$	—		$	12.8		$	—	$	12.8
Interest rate contracts	$	—		$	0.1		$	—	$	0.1
Cross-currency swaps	$	—		$	2.1		$	—	$	2.1
Liabilities:
Commodity contracts	$	(21.2	)	$	(32.9	)	$	—	$	(54.1	)
Foreign currency contracts	$	—		$	(0.1	)	$	—	$	(0.1	)
Interest rate contracts	$	—		$	(21.0	)	$	—	$	(21.0	)
Non-qualified supplemental postretirement grantor trust investments (a)	$	30.0		$	—		$	—	$	30.0
June 30, 2014 (b):
Derivative instruments:
Assets:
Commodity contracts	$	17.9		$	15.1		$	—	$	33.0
Foreign currency contracts	$	—		$	0.8		$	—	$	0.8
Liabilities:
Commodity contracts	$	(15.6	)	$	(15.3	)	$	—	$	(30.9	)
Foreign currency contracts	$	—		$	(5.1	)	$	—	$	(5.1	)
Interest rate contracts	$	—		$	(25.2	)	$	—	$	(25.2	)
Cross-currency swaps	$	—		$	(2.0	)	$	—	$	(2.0	)
Non-qualified supplemental postretirement grantor trust investments (a)	$	30.4		$	—		$	—	$	30.4

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

(b) Certain immaterial amounts have been revised to correct the classification of derivatives.