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Subsequent Event -(Notes)	6 Months Ended
Subsequent Event -(Notes)	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In July 2019, the Company completed the sale of the remaining portion of its oil and gas rights in Eddy County, NM discussed in Note 7. ATI expects to report a pre-tax gain of approximately $62 million in the third quarter of 2019 on this transaction.