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Subsequent Event	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On July 12, 2018, the Company acquired the assets of Addaero Manufacturing (Addaero) for $10 million of cash consideration. Addaero is a leader in metal alloy-based additive manufacturing for the aerospace and defense industries, located in New Britain, CT. Management expects the acquisition to expand the Company’s capabilities to provide comprehensive customer solutions ranging from the design of parts for additive manufacturing to the production of ready-to-install components. The acquisition of Addaero is another building block in the strategy to enhance ATI’s full specialty materials capabilities to provide end customers with finished products, and the business will be reported as part of the High Performance Materials and Components segment from the date of the acquisition.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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