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Debt (Tables)

3 Months Ended

Mar. 30, 2025

Debt Disclosure [Abstract]

Schedule of Debt Instruments

Debt at March 30, 2025 and December 29, 2024 was as follows (in millions): 

			March 30, 2025						December 29, 2024
ATI Inc. 7.25% Notes due 2030			$	425.0					$	425.0
ATI Inc. 5.875% Notes due 2027			350.0						350.0
ATI Inc. 5.125% Notes due 2031			350.0						350.0
ATI Inc. 4.875% Notes due 2029			325.0						325.0
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 facilities			—						—
Finance leases and other			106.7						109.5
Debt issuance costs			(13.5)						(14.2)
Debt			1,893.2						1,895.3
Short-term debt and current portion of long-term debt			179.9						180.4
Long-term debt			$	1,713.3					$	1,714.9

(a) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI.

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- Definition

The entire disclosure for long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/470/tableOfContent

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