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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Schedule of accumulated other comprehensive income (loss) | The changes in AOCI by component, net of tax, for the fiscal years ended December 31, 2022, 2021 and 2020 were as follows (in millions):
| Post- retirement benefit plans |  | Currency translation adjustment |  | Derivatives |  |  | Deferred Tax Asset Valuation Allowance |  | Total |  |
Balance, December 31, 2019 | $ | (1,083.1) |  |  | $ | (76.6) |  |  | $ | (0.5) |  |  | $ | (41.5) |  |  | $ | (1,201.7) |  |  |
OCI before reclassifications |  | (99.3) |  |  |  | 21.1 |  |  |  | (2.0) |  |  |  | — |  |  | (80.2) |  |  |
Amounts reclassified from AOCI | (a) | 62.5 |  |  | (b) | — |  |  | (d) | 4.6 |  |  | (e) | (8.8) |  |  | 58.3 |  |  |
Net current-period OCI |  | (36.8) |  |  |  | 21.1 |  |  |  | 2.6 |  |  |  | (8.8) |  |  | (21.9) |  |  |
Balance, December 31, 2020 |  | (1,119.9) |  |  |  | (55.5) |  |  |  | 2.1 |  |  |  | (50.3) |  |  | (1,223.6) |  |  |
OCI before reclassifications |  | 118.3 |  |  |  | (9.4) |  |  |  | 11.7 |  |  |  | — |  |  | 120.6 |  |  |
Amounts reclassified from AOCI | (a) | 53.9 |  |  | (b) | — |  |  | (d) | (8.7) |  |  | (e) | 66.1 |  |  | 111.3 |  |  |
Net current-period OCI |  | 172.2 |  |  |  | (9.4) |  |  |  | 3.0 |  |  |  | 66.1 |  |  | 231.9 |  |  |
Balance, December 31, 2021 |  | (947.7) |  |  |  | (64.9) |  |  |  | 5.1 |  |  |  | 15.8 |  |  | (991.7) |  |  |
OCI before reclassifications |  | 117.9 |  |  | (25.2) |  |  |  | 41.0 |  |  |  | — |  |  | 133.7 |  |  |
Amounts reclassified from AOCI | (a) | 93.7 |  |  | (c) | 20.0 |  |  | (d) | (32.6) |  |  | (e) | 51.7 |  |  | 132.8 |  |  |
Net current-period OCI |  | 211.6 |  |  |  | (5.2) |  |  |  | 8.4 |  |  |  | 51.7 |  |  | 266.5 |  |  |
Balance, December 31, 2022 | $ | (736.1) |  |  | $ | (70.1) |  |  |  | 13.5 |  |  |  | $ | 67.5 |  |  | $ | (725.2) |  |  |
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2019 | $ | — |  |  | $ | 9.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 9.8 |  |  |
OCI before reclassifications |  | — |  |  |  | 11.4 |  |  |  | — |  |  |  | — |  |  | 11.4 |  |  |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |  |  |
Net current-period OCI |  | — |  |  |  | 11.4 |  |  |  | — |  |  |  | — |  |  | 11.4 |  |  |
Balance, December 31, 2020 |  | — |  |  |  | 21.2 |  |  |  | — |  |  |  | — |  |  | 21.2 |  |  |
OCI before reclassifications |  | — |  |  |  | 4.8 |  |  |  | — |  |  |  | — |  |  | 4.8 |  |  |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |  |  |
Net current-period OCI |  | — |  |  |  | 4.8 |  |  |  | — |  |  |  | — |  |  | 4.8 |  |  |
Balance, December 31, 2021 |  | — |  |  |  | 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, December 31, 2022 | $ | — |  |  | $ | 7.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.7 |  |  |
(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, UK 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, UK 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 2021 income tax provision includes $6.4 million of tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with certain postretirement medical benefits due to plan termination (see Notes 14 and 17).
Reclassification out of accumulated other comprehensive income | Reclassifications out of AOCI for the fiscal years ended December 31, 2022, 2021 and 2020 were as follows:
|  | Amount reclassified from AOCI (d) |  |  |
|  | Fiscal year ended |  |  |
Details about AOCI Components (In millions) |  | December 31, 2022 |  |  |  | December 31, 2021 |  | December 31, 2020 |  |  | Affected line item in the consolidated statement of operations
Postretirement benefit plans |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  | $ | 0.5 |  |  | (a) |  | $ | 1.8 |  | (a) | $ | 3.1 |  | (a) |  |
Actuarial losses |  | (76.7) |  |  | (a) |  | (89.5) |  | (a) | (85.3) |  | (a) |  |
Settlement gain (loss) |  | (29.5) |  |  | (b) |  | 21.9 |  | (a) | — |  |  |  |
|  | (105.7) |  |  | (d) |  | (65.8) |  | (d) | (82.2) |  | (d) |  | Total before tax
|  | (12.0) |  |  |  |  | (11.9) |  |  | (19.7) |  |  |  | Tax benefit (e)
|  | $ | (93.7) |  |  |  |  | $ | (53.9) |  |  | $ | (62.5) |  |  |  | Net of tax
Currency translation adjustment |  | (20.0) |  |  | (b,d) |  | — |  | (d) | — |  | (d) |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |
Nickel and other raw material contracts |  | $ | 26.9 |  |  | (c) |  | $ | 7.1 |  | (c) | $ | (0.8) |  | (c) |  |
Natural gas contracts |  | 15.1 |  |  | (c) |  | 5.3 |  | (c) | (3.7) |  | (c) |  |
Foreign exchange contracts |  | 0.9 |  |  | (c) |  | 0.1 |  | (c) | (0.1) |  | (c) |  |
Interest rate swap |  | (0.1) |  |  | (c) |  | (1.1) |  | (c) | (1.4) |  | (c) |  |
|  | 42.8 |  |  | (d) |  | 11.4 |  | (d) | (6.0) |  | (d) |  | Total before tax
|  | 10.2 |  |  |  |  | 2.7 |  |  | (1.4) |  |  |  | Tax provision (benefit) (e)
|  | $ | 32.6 |  |  |  |  | $ | 8.7 |  |  | $ | (4.6) |  |  |  | Net of tax
(a)Amounts are included in nonoperating retirement benefit expense (see Note 14). (b)Amounts in 2022 were included in loss on asset sales and sales of businesses, net, as part of the loss on sale of the Sheffield, UK 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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