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Debt (Tables)
 12 Months Ended
Dec. 29, 2024
Debt Disclosure [Abstract]  
Schedule of debt
Debt at December 29, 2024 and December 31, 2023 was as follows:
Fiscal Year
(In millions)20242023
ATI Inc. 7.25% Notes due 2030
$425.0 $425.0 
ATI Inc. 5.875% Senior Notes due 2027
350.0 350.0 
ATI Inc. 5.125% Senior Notes due 2031
350.0 350.0 
ATI Inc. 4.875% Notes due 2029
325.0 325.0 
ATI Inc. 3.5% Convertible Senior Notes due 2025
— 291.4 
Allegheny Ludlum 6.95% Debentures due 2025 (a)
150.0 150.0 
ABL Term Loan 200.0 200.0 
U.S. revolving credit facility— — 
Foreign credit agreements— 5.0 
Finance leases and other109.5 102.8 
Debt issuance costs(14.2)(19.6)
Total short-term and long-term debt1,895.3 2,179.6 
Short-term debt and current portion of long-term debt180.4 31.9 
Total long-term debt$1,714.9 $2,147.7 
(a)The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI.
Interest Income and Interest Expense Disclosure Interest expense on the 2025 Convertible Notes was as follows:
Fiscal Year
(in millions)202420232022
Contractual coupon rate$7.2 $10.2 $10.2 
Amortization of debt issuance costs1.3 1.9 1.8 
   Total interest expense$8.5 $12.1 $12.0 
Interest expense on the 2022 Convertible Notes was as follows:
Fiscal Year
(in millions)2022
Contractual coupon rate$2.0 
Amortization of debt issuance costs0.3 
   Total interest expense$2.3