Debt (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Schedule of Debt Instruments

Debt at September 30, 2016 and December 31, 2015 was as follows (in millions):

	September 30, 2016			December 31, 2015
Allegheny Technologies 5.875% Notes due 2023 (a)	$	500.0		$	500.0
Allegheny Technologies 5.95% Notes due 2021	500.0			500.0
Allegheny Technologies 9.375% Notes due 2019	350.0			350.0
Allegheny Technologies 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 facilities	3.8			1.4
Industrial revenue bonds, due through 2020, and other	2.5			3.8
Debt issuance costs	(18.0		)	(9.5		)
Total debt	1,875.8			1,495.7
Short-term debt and current portion of long-term debt	5.4			3.9
Total long-term debt	$	1,870.4		$	1,491.8

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