Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Debt Instruments

Debt at June 30, 2019 and December 31, 2018 was as follows (in millions): 

	June 30, 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	5.4			—
Other	14.7			15.0
Debt issuance costs	(9.0		)	(10.4		)
Total debt	1,548.6			1,542.1
Short-term debt and current portion of long-term debt	11.5			6.6
Total long-term debt	$	1,537.1		$	1,535.5

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