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Financial Instruments (Narrative) (Details) lb in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) lb	Dec. 31, 2022 USD ($) lb
Derivative [Line Items]
Weight of aluminum that hedged future purchase of aluminum to meet fixed-price forward sales contract obligations, lbs | lb	5.6	20.3
Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar	$ 139.0
Amounts of unrealized after-tax gains on derivative instruments	0.8
Aluminum Futures Contracts
Derivative [Line Items]
Derivative, Notional Amount, Net	$ 7.7	$ 30.7

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Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480870/815-30-50-1

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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Nominal mass used to calculate payments on a derivative instrument.

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