Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of debt

Debt at December 31, 2016 and 2015 was as follows:

(In millions)	2016			2015
Allegheny Technologies $500 million 5.875% Senior Notes due 2023 (a)	$	500.0		$	500.0
Allegheny Technologies $500 million 5.95% Senior Notes due 2021	500.0			500.0
Allegheny Technologies $350 million 9.375% Senior Notes due 2019	350.0			350.0
Allegheny Technologies $287.5 million 4.75% Convertible Senior Notes due 2022	287.5			—
Allegheny Ludlum 6.95% Debentures due 2025	150.0			150.0
Term Loan due 2017	100.0			—
U.S. revolving credit facility	—			—
Foreign credit agreements	4.4			1.4
Industrial revenue bonds, due through 2020, and other	2.2			3.8
Debt issuance costs	(17.1		)	(9.5		)
Total short-term and long-term debt	1,877.0			1,495.7
Short-term debt and current portion of long-term debt	105.1			3.9
Total long-term debt	$	1,771.9		$	1,491.8

(a) Bearing interest at 7.875% effective February 15, 2016.