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Derivatives - Schedule Of Commodity Swap Contracts (Details) - Cash Flow Hedging - Designated as Hedge $ in Millions | 12 Months Ended
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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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- Details
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