Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Debt Instruments

Debt at March 31, 2019 and December 31, 2018 was as follows (in millions):

	March 31, 2019			December 31, 2018
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 4.75% Convertible Senior Notes due 2022	287.5			287.5
Allegheny Ludlum 6.95% Debentures due 2025	150.0			150.0
Term Loan due 2022	100.0			100.0
U.S. revolving credit facility	—			—
Foreign credit facilities	—			—
Other	14.8			15.0
Debt issuance costs	(9.7		)	(10.4		)
Total debt	1,542.6			1,542.1
Short-term debt and current portion of long-term debt	6.4			6.6
Total long-term debt	$	1,536.2		$	1,535.5

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