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Debt (Tables)
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Debt Instruments
Debt at September 30, 2019 and December 31, 2018 was as follows (in millions): 
 
September 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 2024
100.0

 
100.0

U.S. revolving credit facility

 

Foreign credit facilities
5.1

 

Other
19.5

 
15.0

Debt issuance costs
(8.3
)
 
(10.4
)
Total debt
1,553.8

 
1,542.1

Short-term debt and current portion of long-term debt
12.1

 
6.6

Total long-term debt
$
1,541.7

 
$
1,535.5

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