Fair Value Measurement (Tables)

12 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

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, 2014 and 2013:

	Asset (Liability)
	Level 1			Level 2			Level 3		Total
September 30, 2014:
Derivative instruments:
Assets:
Commodity contracts	$	10.6		$	19.8		$	—	$	30.4
Foreign currency contracts	$	—		$	12.8		$	—	$	12.8
Cross-currency swaps	$	—		$	2.1		$	—	$	2.1
Interest rate contracts	$	—		$	0.1		$	—	$	0.1
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
September 30, 2013 (b):
Derivative instruments:
Assets:
Commodity contracts	$	2.6		$	22.8		$	—	$	25.4
Foreign currency contracts	$	—		$	0.9		$	—	$	0.9
Liabilities:
Commodity contracts	$	(8.8	)	$	(9.3	)	$	—	$	(18.1	)
Foreign currency contracts	$	—		$	(7.2	)	$	—	$	(7.2	)
Interest rate contracts	$	—		$	(31.0	)	$	—	$	(31.0	)
Cross-currency swaps	$	—		$	(1.2	)	$	—	$	(1.2	)
Non-qualified supplemental postretirement grantor trust investments (a)	$	27.1		$	—		$	—	$	27.1

(a) Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans (see Note 8).

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