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Debt (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Debt Instruments
Debt at March 31, 2021 and December 31, 2020 was as follows (in millions): 
March 31,
2021
December 31,
2020
Allegheny Technologies 5.875% Notes due 2023 (a)
$500.0 $500.0 
Allegheny Technologies 5.875% Notes due 2027
350.0 350.0 
Allegheny Technologies 3.5% Convertible Senior Notes due 2025
291.4 291.4 
Allegheny Technologies 4.75% Convertible Senior Notes due 2022
84.2 84.2 
Allegheny Ludlum 6.95% Debentures due 2025 (b)
150.0 150.0 
Term Loan due 2024200.0 200.0 
U.S. revolving credit facility— — 
Foreign credit facilities2.2 5.5 
Finance leases and other51.4 48.0 
Debt issuance costs(15.1)(14.5)
Equity component of convertible debt— (46.8)
Total debt1,614.1 1,567.8 
Short-term debt and current portion of long-term debt15.7 17.8 
Total long-term debt$1,598.4 $1,550.0 
 
(a) Bearing interest at 7.875% effective February 15, 2016.
(b) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed
by ATI.