Gross Amounts of Recognized Assets and Liabilities (Detail) $ in Millions	Sep. 30, 2015 USD ($)
Fair Value of Derivatives, Asset
Derivative assets as classified in the unaudited condensed consolidated balance sheet	$ 0.6
Derivative assets, effect of counterparty netting arrangements	(0.6)
Fair Value of Derivatives, Liability
Derivative liabilities as classified in the unaudited condensed consolidated balance sheet	(1.4)
Derivative liabilities, effect of counterparty netting arrangements	0.6
Net derivatives as classified in the condensed consolidated balance sheet	(0.8)
Metal
Fair Value of Derivatives, Asset
Derivative assets as classified in the unaudited condensed consolidated balance sheet	0.6
Fair Value of Derivatives, Liability
Derivative liabilities as classified in the unaudited condensed consolidated balance sheet	(1.1)
Natural Gas
Fair Value of Derivatives, Liability
Derivative liabilities as classified in the unaudited condensed consolidated balance sheet	$ (0.3)

Derivative fair value Of derivative assets, counterparty netting.

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- Definition

Derivative fair value Of derivative liability, counterparty netting.

+ References

No definition available.

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- References

No definition available.

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section 55

-Paragraph 7

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

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-Section 50

-Paragraph 4D

-Subparagraph (c)(2)

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4D

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

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Fair value, after effects of master netting arrangements, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (a)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Paragraph 3

-Subparagraph (e)

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- References

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