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Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Schedule of defined benefit plans | The components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following:
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Service cost—benefits earned during the year |  | $ | 11.9 |  |  | $ | 15.1 |  |  | $ | 12.7 |  |  | $ | 1.1 |  |  | $ | 1.5 |  |  | $ | 2.3 |
Interest cost on benefits earned in prior years |  | 69.7 |  |  | 68.4 |  |  | 86.3 |  |  | 7.7 |  |  | 8.0 |  |  | 10.7 |
Expected return on plan assets |  | (128.2) |  |  | (136.4) |  |  | (134.5) |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) |  | 0.4 |  |  | 0.6 |  |  | 0.7 |  |  | (0.9) |  |  | (2.4) |  |  | (3.8) |
Amortization of net actuarial loss |  | 63.5 |  |  | 75.6 |  |  | 74.5 |  |  | 13.2 |  |  | 13.9 |  |  | 10.8 |
Settlement loss (gain) |  | 29.5 |  |  | — |  |  | — |  |  | — |  |  | (64.9) |  |  | — |
Curtailment gain |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.2) |
Termination benefits |  | — |  |  | — |  |  | 10.9 |  |  | — |  |  | — |  |  | 6.7 |
Total retirement benefit expense (income) |  | $ | 46.8 |  |  | $ | 23.3 |  |  | $ | 50.6 |  |  | $ | 21.1 |  |  | $ | (43.9) |  |  | $ | 26.5 |
Schedule of assumptions used | Actuarial assumptions used to develop the components of defined benefit pension expense and other postretirement benefit expense were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
|  | 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Discount rate |  | 2.95 | % |  | 2.60 | % |  | 3.40 | % |  | 2.80 | % |  | 2.45 | % |  | 3.25 | %
Rate of increase in future compensation levels |  | 2.00% - 3.00% |  | 1.00 | % |  | 1.00 | % |  | — |  |  | — |  |  | — |
Weighted average expected long-term rate of return on assets |  | 6.43 | % |  | 6.71 | % |  | 7.16 | % |  | — | % |  | — | % |  | — | %
Schedule of assumptions used for year end valuation | Actuarial assumptions used for the valuation of defined benefit pension and other postretirement benefit obligations at the end of the respective periods were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Discount rate |  | 5.55 | % |  | 2.95 | % |  | 5.45 | % |  | 2.80 | %
Rate of increase in future compensation levels |  | 3.00 | % |  | 2.00% - 3.00% |  | — |  |  | — |
Schedule of changes in projected benefit obligations | A reconciliation of the funded status for the Company’s defined benefit pension and other postretirement benefit plans at December 31, 2022 and 2021 was as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Change in benefit obligations: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 2,517.0 |  |  | $ | 2,720.1 |  |  | $ | 287.3 |  |  | $ | 357.6 |
Service cost |  | 11.9 |  |  | 15.1 |  |  | 1.1 |  |  | 1.5 |
Interest cost |  | 69.7 |  |  | 68.4 |  |  | 7.7 |  |  | 8.0 |
Benefits paid |  | (155.6) |  |  | (235.0) |  |  | (29.7) |  |  | (28.9) |
Subsidy received |  | — |  |  | — |  |  | 0.3 |  |  | 0.4 |
Divestiture |  | (75.8) |  |  | — |  |  | — |  |  | — |
Effect of currency rates |  | (3.2) |  |  | (1.3) |  |  | — |  |  | — |
Net actuarial (gains) losses – discount rate change |  | (556.8) |  |  | (104.0) |  |  | (48.2) |  |  | (9.0) |
– other |  | 11.1 |  |  | 53.7 |  |  | (5.8) |  |  | 0.7 |
Settlement gain |  | — |  |  | — |  |  | — |  |  | (43.0) |
Benefit obligation at end of year |  | $ | 1,818.3 |  |  | $ | 2,517.0 |  |  | $ | 212.7 |  |  | $ | 287.3 |
Schedule of changes in fair value of plan assets |
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 2,120.9 |  |  | $ | 2,046.4 |  |  | $ | — |  |  | $ | — |
Actual returns on plan assets and plan expenses |  | (317.0) |  |  | 233.8 |  |  | — |  |  | — |
Employer contributions |  | 57.4 |  |  | 77.3 |  |  | — |  |  | — |
Divestiture |  | (101.8) |  |  | — |  |  | — |  |  | — |
Effect of currency rates |  | (4.4) |  |  | (1.6) |  |  | — |  |  | — |
Benefits paid |  | (155.6) |  |  | (235.0) |  |  | — |  |  | — |
Fair value of plan assets at end of year |  | $ | 1,599.5 |  |  | $ | 2,120.9 |  |  | $ | — |  |  | $ | — |
Schedule of amounts recognized in balance sheet |
Assets (liabilities) recognized in the consolidated balance sheets: |  |  |  |  |  |
|  | Pension Benefits |  | Other Postretirement Benefits
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Noncurrent assets |  | $ | 12.5 |  |  | $ | 25.0 |  |  | $ | — |  |  | $ | — |
Current liabilities |  | (5.7) |  |  | (5.7) |  |  | (27.8) |  |  | (29.2) |
Noncurrent liabilities |  | (225.6) |  |  | (415.4) |  |  | (184.9) |  |  | (258.1) |
Total amount recognized |  | $ | (218.8) |  |  | $ | (396.1) |  |  | $ | (212.7) |  |  | $ | (287.3) |
Schedule of amounts recognized in other comprehensive income | Changes to accumulated other comprehensive loss related to pension and other postretirement benefit plans in 2022 and 2021 were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Beginning of year accumulated other comprehensive loss |  | $ | (1,376.5) |  |  | $ | (1,600.3) |  |  | $ | (121.2) |  |  | $ | (119.1) |
Amortization of net actuarial loss |  | 63.5 |  |  | 75.6 |  |  | 13.2 |  |  | 13.9 |
Amortization of prior service cost (credit) |  | 0.4 |  |  | 0.6 |  |  | (0.9) |  |  | (2.4) |
Settlement loss (gain) |  | 29.5 |  |  | — |  |  | — |  |  | (21.9) |
Remeasurements |  | 101.9 |  |  | 147.6 |  |  | 53.1 |  |  | 8.3 |
End of year accumulated other comprehensive loss |  | $ | (1,181.2) |  |  | $ | (1,376.5) |  |  | $ | (55.8) |  |  | $ | (121.2) |
Net change in accumulated other comprehensive loss |  | $ | 195.3 |  |  | $ | 223.8 |  |  | $ | 65.4 |  |  | $ | (2.1) |
Schedule of net periodic benefit cost not yet recognized | Amounts included in accumulated other comprehensive loss at December 31, 2022 and 2021 were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Prior service (cost) credit |  | $ | (8.8) |  |  | $ | (9.9) |  |  | $ | 2.5 |  |  | $ | 3.4 |
Net actuarial loss |  | (1,172.4) |  |  | (1,366.6) |  |  | (58.3) |  |  | (124.6) |
Accumulated other comprehensive loss |  | (1,181.2) |  |  | (1,376.5) |  |  | (55.8) |  |  | (121.2) |
Deferred tax effect |  | 473.1 |  |  | 507.6 |  |  | 27.8 |  |  | 42.4 |
Accumulated other comprehensive loss, net of tax |  | $ | (708.1) |  |  | $ | (868.9) |  |  | $ | (28.0) |  |  | $ | (78.8) |
Schedule of amounts in accumulated other comprehensive income to be recognized | Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost in 2023 are:
(In millions) |  | Pension Benefits |  | Other Postretirement Benefits |  | Total
Amortization of prior service cost (credit) |  | $ | 0.4 |  |  | $ | (0.9) |  |  | $ | (0.5) |
Amortization of net actuarial loss |  | 57.7 |  |  | 6.0 |  |  | 63.7 |
Amortization of accumulated other comprehensive loss |  | $ | 58.1 |  |  | $ | 5.1 |  |  | $ | 63.2 |
Schedule of accumulated benefit obligations in excess of fair value of plan assets | Additional information for pension plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets:
|  | Pension Benefits
(In millions) |  | 2022 |  | 2021
Projected benefit obligation |  | $ | 1,727.3 |  |  | $ | 2,417.0 |
Accumulated benefit obligation |  | $ | 1,716.8 |  |  | $ | 2,398.0 |
Fair value of plan assets |  | $ | 1,496.0 |  |  | $ | 1,995.9 |
Schedule of expected benefit payments | The following table summarizes expected benefit payments from the Company’s various pension and other postretirement defined benefit plans through 2032, and also includes estimated Medicare Part D subsidies projected to be received during this period based on currently available information. Pension benefit payments for the U.S. qualified defined benefit pension plans are made from pension plan assets.
(In millions) |  | Pension Benefits |  | Other Postretirement Benefits |  | Medicare Part D Subsidy
2023 |  | $ | 157.5 |  |  | $ | 27.8 |  |  | $ | — |
2024 |  | 155.0 |  |  | 26.0 |  |  | — |
2025 |  | 152.3 |  |  | 24.0 |  |  | — |
2026 |  | 149.6 |  |  | 22.1 |  |  | — |
2027 |  | 146.8 |  |  | 20.4 |  |  | — |
2028-2032 |  | 684.0 |  |  | 77.5 |  |  | — |
Schedule of allocation of plan assets | The fair values of the Company’s pension plan assets are determined using net asset value (NAV) as a practical expedient, or by information categorized in the fair value hierarchy level based on the inputs used to determine fair value, as further discussed in Note 13. The fair values at December 31, 2022 were as follows:
(In millions) |  |  |  |  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Observable Inputs |  | Significant Unobservable Inputs
Asset category |  | Total |  | NAV |  | (Level 1) |  | (Level 2) |  | (Level 3)
Equity securities: |  |  |  |  |  |  |  |  |  |
U.S. equities |  | $ | 363.1 |  |  | $ | 202.6 |  |  | $ | 160.5 |  |  | $ | — |  |  | $ | — |
International equities |  | 299.7 |  |  | 284.8 |  |  | 14.9 |  |  | — |  |  | — |
Fixed income and cash equivalents |  | 455.4 |  |  | 330.8 |  |  | 13.8 |  |  | 110.8 |  |  | — |
Private equity |  | 224.3 |  |  | 224.3 |  |  | — |  |  | — |  |  | — |
Alternative investments- hedge funds, real estate and other |  | 257.0 |  |  | 257.0 |  |  | — |  |  | — |  |  | — |
Total assets |  | $ | 1,599.5 |  |  | $ | 1,299.5 |  |  | $ | 189.2 |  |  | $ | 110.8 |  |  | $ | — |
The fair values of the Company’s pension plan assets at December 31, 2021 were as follows:
(In millions) |  |  |  |  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Observable Inputs |  | Significant Unobservable Inputs
Asset category |  | Total |  | NAV |  | (Level 1) |  | (Level 2) |  | (Level 3)
Equity securities: |  |  |  |  |  |  |  |  |  |
U.S. equities |  | $ | 509.8 |  |  | $ | 281.4 |  |  | $ | 228.4 |  |  | $ | — |  |  | $ | — |
International equities |  | 408.8 |  |  | 396.6 |  |  | 12.2 |  |  | — |  |  | — |
Fixed income and cash equivalents |  | 707.7 |  |  | 482.3 |  |  | 24.5 |  |  | 200.9 |  |  | — |
Private equity |  | 176.7 |  |  | 176.7 |  |  | — |  |  | — |  |  | — |
Alternative investments- hedge funds, real estate and other |  | 317.9 |  |  | 317.9 |  |  | — |  |  | — |  |  | — |
Total assets |  | $ | 2,120.9 |  |  | $ | 1,654.9 |  |  | $ | 265.1 |  |  | $ | 200.9 |  |  | $ | — |
Schedule of target asset allocations for pension plans | The target asset allocations for ATI Pension Plan for 2023, by major investment category, are:
Asset category |  | Target asset allocation range
Equities |  | 30% - 70%
Fixed income and cash equivalents |  | 15% - 40%
Private equity |  | 0% - 30%
Alternative investments- hedge funds, real estate and other |  | 10% - 30%
Schedule of multiemployer plans | The Company’s participation in multiemployer plans for the years ended December 31, 2022, 2021 and 2020 is reported in the following table.
|  |  |  | Pension Protection Act Zone Status (1) |  | FIP / RP Status Pending / Implemented (2) |  | in millions |  |  |  | Expiration Dates of Collective Bargaining Agreements
|  | EIN / Pension Plan Number |  |  |  | Company Contributions |  | Surcharge Imposed (3) |
Pension Fund |  |  | 2022 |  | 2021 |  |  | 2022 |  | 2021 |  | 2020 |  |
Steelworkers Western Independent Shops Pension Plan |  | 90-0169564 / 001 |  | Green |  | Green |  | N/A |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.7 |  |  | No |  | 2/28/2025
Boilermakers-Blacksmiths National Pension Trust |  | 48-6168020 / 001 |  | Green |  | Yellow |  | Yes |  | 2.3 |  |  | 2.0 |  |  | 2.1 |  |  | No |  | 9/30/2026
IAM National Pension Fund |  | 51-6031295 / 002 |  | Red |  | Red |  | Yes |  | 1.9 |  |  | 1.9 |  |  | 2.0 |  |  | Yes |  | Various between 2023-2028 (4)
Total contributions |  |  |  |  |  |  |  |  |  | $ | 4.3 |  |  | $ | 4.0 |  |  | $ | 4.8 |  |  |  |  |
(1)The most recent Pension Protection Act Zone Status is based on information provided to ATI and other participating employers by each plan, as certified by the plan’s actuary. A plan in the “deep red” zone had been determined to be in “critical and declining status”, based on criteria established by the Internal Revenue Code (Code), and is in critical status (as defined by the “red” zone) and is projected to become insolvent (run out of money to pay benefits) within 15 years (or within 20 years if a special rule applies). A plan in the “red” zone had been determined to be in “critical status”, based on criteria established by the Code, and is generally less than 65% funded. A plan in the “yellow” zone has been determined to be in “endangered status”, based on criteria established under the Code, and is generally less than 80% funded. A plan in the “green” zone has been determined to be neither in “critical status” nor in “endangered status”, and is generally at least 80% funded. Additionally, a plan may voluntarily place itself into a rehabilitation plan. In April 2019, the Company received notification from the IAM National Pension Fund (IAM Fund) that its’ actuary certified the IAM Fund as “endangered status” for the plan year beginning January 1, 2019, and that the IAM Fund was voluntarily placing itself in “red” zone status and implementing a rehabilitation plan. In April 2020, 2021 and 2022, the Company received notification from the IAM Fund that it was certified by its actuary as being in “red” zone status for the plan years beginning January 1, 2020 and 2021. A contribution surcharge was imposed as of June 1, 2019 in addition to the contribution rate specified in the applicable collective bargaining agreements. The contribution surcharge remains in effect, and ends when an employer begins contributing under a collective bargaining agreement that includes terms consistent with the rehabilitation plan. In April 2019, the Company received notifications from the Boilermakers-Blacksmiths National Pension Trust (Blacksmiths Trust) that it was certified by its actuary as being in “red” zone status for the plan year beginning January 1, 2019. A rehabilitation plan has been adopted for the Blacksmiths Trust, and the Company and the Blacksmiths union agreed to adopt the rehabilitation plan in 2019 prior to a contribution surcharge being imposed. In April 2020 and 2021, the funding status improved for the Blacksmiths Trust as it was certified by its actuary as being in the “yellow” zone for the plan years beginning January 1, 2020 and 2021. In April 2022, the funding status further improved to being in the "green" zone for the plan year beginning January 1, 2022. (2)The “FIP / RP Status Pending / Implemented” column indicates whether a Funding Improvement Plan, as required under the Code by plans in the “yellow” zone, or a Rehabilitation Plan, as required under the Code to be adopted by plans in the “red” or “deep red” zones, is pending or has been implemented as of the end of the plan year that ended in 2022. (3)The “Surcharge Imposed” column indicates whether ATI’s contribution rate for 2022 included an amount in addition to the contribution rate specified in the applicable collective bargaining agreement, as imposed by a plan in “critical status” or “critical and declining status”, in accordance with the requirements of the Code. (4)The Company is party to five separate bargaining agreements that require contributions to this plan. Expiration dates of these collective bargaining agreements range between November 13, 2023 and July 14, 2028.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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