Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of debt

Debt at December 31, 2019 and 2018 was as follows: 

(In millions)	2019			2018
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
Allegheny Technologies $350 million 5.875% Senior Notes due 2027	350.0			—
Allegheny Technologies $287.5 million 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 2024	100.0			100.0
U.S. revolving credit facility	—			—
Foreign credit agreements	4.9			—
Finance leases and other	18.8			15.0
Debt issuance costs	(12.3		)	(10.4		)
Total short-term and long-term debt	1,398.9			1,542.1
Short-term debt and current portion of long-term debt	11.5			6.6
Total long-term debt	$	1,387.4		$	1,535.5

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