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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Management evaluated all activity of the Company and concluded that no subsequent events have occurred that would require recognition in the Consolidated Financial Statements or disclosure in the Notes to the Consolidated Financial Statements, except as noted below: See Note N for details of both the issuance and early redemption of debt and changes to the Company's credit facilities. See Note R for updates on the Arconic Inc. Separation Transaction.