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Derivatives - Schedule Of Commodity Swap Contracts (Details) - Cash Flow Hedging - Designated as Hedge $ in Millions	12 Months Ended
	Sep. 30, 2020 USD ($) t	Sep. 30, 2019 USD ($) t
Brass swap contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional | t	949.0	904.9
Contract Value | $	$ 4.4	$ 4.4
Zinc swap contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional | t	1,552.0	0
Contract Value | $	$ 3.4	$ 0.0

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Nominal mass used to calculate payments on a derivative instrument.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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