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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 29, 2024
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) The changes in AOCI by component, net of tax, for the fiscal years ended December 29, 2024, December 31, 2023 and January 1, 2023 were as follows (in millions):
| Post- retirement benefit plans |  | Currency translation adjustment |  | Derivatives |  |  | Deferred Tax Asset Valuation Allowance Revised |  | Total
Balance, January 2, 2022 | $ | (86.6) |  |  | $ | (64.9) |  |  | $ | 5.1 |  |  | $ | 5.1 |  |  | $ | (141.3) |
OCI before reclassifications |  | 41.3 |  |  |  | (25.2) |  |  |  | 41.0 |  |  |  | — |  |  | 57.1 |
Amounts reclassified from AOCI | (a) | 10.6 |  |  | (c) | 20.0 |  |  | (d) | (32.6) |  |  | (e) | 18.8 |  |  | 16.8 |
Net current-period OCI |  | 51.9 |  |  |  | (5.2) |  |  |  | 8.4 |  |  |  | 18.8 |  |  | 73.9 |
Balance, January 1, 2023 |  | (34.7) |  |  |  | (70.1) |  |  |  | 13.5 |  |  |  | 23.9 |  |  | (67.4) |
OCI before reclassifications |  | (2.9) |  |  |  | 1.7 |  |  |  | (21.8) |  |  |  | — |  |  | (23.0) |
Amounts reclassified from AOCI | (a) | 5.1 |  |  | (b) | — |  |  | (d) | 1.9 |  |  | (e) | 0.2 |  |  | 7.2 |
Net current-period OCI |  | 2.2 |  |  |  | 1.7 |  |  |  | (19.9) |  |  |  | 0.2 |  |  | (15.8) |
Balance, December 31, 2023 |  | (32.5) |  |  |  | (68.4) |  |  |  | (6.4) |  |  |  | 24.1 |  |  | (83.2) |
OCI before reclassifications |  | (1.6) |  |  |  | (11.4) |  |  |  | (4.5) |  |  |  | — |  |  | (17.5) |
Amounts reclassified from AOCI | (a) | 3.6 |  |  | (b) | — |  |  | (d) | 8.4 |  |  | (e) | (0.8) |  |  | 11.2 |
Net current-period OCI |  | 2.0 |  |  |  | (11.4) |  |  |  | 3.9 |  |  |  | (0.8) |  |  | (6.3) |
Balance, December 29, 2024 | $ | (30.5) |  |  | $ | (79.8) |  |  | $ | (2.5) |  |  | $ | 23.3 |  |  | $ | (89.5) |
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, January 2, 2022 | $ | — |  |  | $ | 26.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 26.0 |
OCI before reclassifications |  | — |  |  |  | (18.3) |  |  |  | — |  |  |  | — |  |  | (18.3) |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (18.3) |  |  |  | — |  |  |  | — |  |  | (18.3) |
Balance, January 1, 2023 |  | — |  |  |  | 7.7 |  |  |  | — |  |  |  | — |  |  | 7.7 |
OCI before reclassifications |  | — |  |  |  | (0.4) |  |  |  | — |  |  |  | — |  |  | (0.4) |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (0.4) |  |  |  | — |  |  |  | — |  |  | (0.4) |
Balance, December 31, 2023 |  | — |  |  |  | 7.3 |  |  |  | — |  |  |  | — |  |  | 7.3 |
OCI before reclassifications |  | — |  |  |  | (1.6) |  |  |  | — |  |  |  | — |  |  | (1.6) |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (1.6) |  |  |  | — |  |  |  | — |  |  | (1.6) |
Balance, December 29, 2024 | $ | — |  |  | $ | 5.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 5.7 |
(a)Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 14) and/or loss on asset sales and sales of businesses, net, as part of the loss on sale of the Sheffield, U.K. operations (see Note 6). (b)No amounts were reclassified to earnings. (c)Amounts were included in loss on asset sales and sales of businesses, net, as part of the loss on sale of the Sheffield, U.K. operations (see Note 6). (d)Amounts related to derivatives are included in sales, cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 12). (e)Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates. The income tax provision for the fiscal year ended December 29, 2024 includes $0.8 million of a tax benefit for the recognition of a stranded deferred tax valuation allowance that was associated with the Company’s interest rate swap due to its maturity. Other comprehensive income (loss) amounts (OCI) reported above by category are net of applicable income tax expense (benefit) for each year presented. Income tax expense (benefit) on OCI items is recorded as a change in a deferred tax asset or liability. Amounts recognized in OCI include the impact of any deferred tax asset valuation allowances, when applicable. Foreign currency translation adjustments, including those pertaining to noncontrolling interests, are generally not adjusted for income taxes as they relate to indefinite investments in non-U.S. subsidiaries. Reclassifications out of AOCI for the fiscal years ended December 29, 2024, December 31, 2023 and January 1, 2023 were as follows:
|  | Amount reclassified from AOCI (d) |  |  |
|  | Fiscal year ended |  |  |
Details about AOCI Components (In millions) |  | December 29, 2024 |  |  |  | December 31, 2023 |  | January 1, 2023 |  |  | Affected line item in the consolidated statement of operations
Postretirement benefit plans Revised |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  | $ | 0.5 |  |  | (a) |  | $ | 0.6 |  | (a) | $ | 0.5 |  | (a) |  |
Actuarial losses |  | (5.2) |  |  | (a) |  | (6.0) |  | (a) | (13.2) |  | (a) |  |
Settlement loss |  | — |  |  | (a) |  | (1.1) |  | (a) | (0.7) |  | (b) |  |
|  | (4.7) |  |  | (d) |  | (6.5) |  | (d) | (13.4) |  | (d) |  | Total before tax
|  | (1.1) |  |  |  |  | (1.4) |  |  | (2.8) |  |  |  | Tax benefit (e)
|  | $ | (3.6) |  |  |  |  | $ | (5.1) |  |  | $ | (10.6) |  |  |  | Net of tax
Currency translation adjustment |  | — |  |  | (d) |  | — |  | (d) | (20.0) |  | (b,d) |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |
Nickel and other raw material contracts |  | $ | (4.8) |  |  | (c) |  | $ | 3.3 |  | (c) | $ | 26.9 |  | (c) |  |
Natural gas contracts |  | (8.0) |  |  | (c) |  | (7.5) |  | (c) | 15.1 |  | (c) |  |
Foreign exchange contracts |  | 0.2 |  |  | (c) |  | 0.3 |  | (c) | 0.9 |  | (c) |  |
Interest rate swap |  | 1.6 |  |  | (c) |  | 1.4 |  | (c) | (0.1) |  | (c) |  |
|  | (11.0) |  |  | (d) |  | (2.5) |  | (d) | 42.8 |  | (d) |  | Total before tax
|  | (2.6) |  |  |  |  | (0.6) |  |  | 10.2 |  |  |  | Tax provision (benefit) (e)
|  | $ | (8.4) |  |  |  |  | $ | (1.9) |  |  | $ | 32.6 |  |  |  | Net of tax
(a)Amounts are included in nonoperating retirement benefit expense (see Note 14). (b)A mounts in 2022 were included in loss on asset sales and sales of businesses, net, as part of the loss on sale of the Sheffield, U.K. operations (see Note 6). (c)Amounts related to derivatives, with the exception of the interest rate swap, are included in sales or cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the interest rate swap are included in interest expense in the same period as the interest expense on the ABL Term Loan is recognized in earnings (see Note 12). (d)For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations. (e)These amounts exclude the impact of any deferred tax asset valuation allowances, when applicable, including recognition of stranded balances (see Note 17 for further explanation).

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