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Redeemable Noncontrolling Interest	9 Months Ended
Redeemable Noncontrolling Interest	Sep. 30, 2016
Noncontrolling Interest [Abstract]
Redeemable Noncontrolling Interest	Redeemable Noncontrolling Interest During the first nine months of 2016, the 15.0% redeemable noncontrolling interest in ATI Flowform Products was purchased by ATI at the $12.1 million acquisition date carrying value, resulting in no remaining redeemable noncontrolling interest held in ATI Flowform Products as of September 30, 2016.