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Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan [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) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost—benefits earned during the year |  | $ | 14.1 |  |  | $ | 20.6 |  |  | $ | 22.8 |  |  | $ | 2.4 |  |  | $ | 2.6 |  |  | $ | 2.7 |
Interest cost on benefits earned in prior years |  | 116.7 |  |  | 125.4 |  |  | 121.0 |  |  | 14.6 |  |  | 16.0 |  |  | 17.9 |
Expected return on plan assets |  | (146.9 | ) |  | (148.7 | ) |  | (168.3 | ) |  | — |  |  | (0.1 | ) |  | (0.1 | )
Amortization of prior service cost (credit) |  | 1.3 |  |  | 1.3 |  |  | 1.3 |  |  | (2.9 | ) |  | (1.7 | ) |  | 4.9 |
Amortization of net actuarial loss |  | 62.6 |  |  | 65.4 |  |  | 60.4 |  |  | 9.0 |  |  | 9.6 |  |  | 14.6 |
Termination benefits |  | — |  |  | 1.1 |  |  | — |  |  | — |  |  | 2.3 |  |  | — |
Total retirement benefit expense |  | $ | 47.8 |  |  | $ | 65.1 |  |  | $ | 37.2 |  |  | $ | 23.1 |  |  | $ | 28.7 |  |  | $ | 40.0 |
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
|  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate (a) |  | 4.45 | % |  | 4.65 | % |  | 4.25 | % |  | 4.35 | % |  | 4.05 - 4.50% |  |  | 4.10 | %
Rate of increase in future compensation levels |  | 0.50 - 1.00% |  |  | 3.0 - 3.50% |  |  | 3.0 - 3.50% |  |  | — |  |  | — |  |  | — |
Expected long-term rate of return on assets |  | 7.75 | % |  | 8.00 | % |  | 8.00 | % |  | 4.0 | % |  | 4.0 | % |  | 4.0 | %
(a) | Other postretirement benefits expense for 2016 was initially measured at a 4.50% discount rate. A portion of the obligation was remeasured using a 4.05% discount rate as of March 1, 2016, following a new USW labor agreement.
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
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate |  | 3.85 | % |  | 4.45 | % |  | 3.80 | % |  | 4.35 | %
Rate of increase in future compensation levels |  | 0.50 - 1.00% |  |  | 1.00 | % |  | — |  |  | — |
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, 2017 and 2016 was as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Change in benefit obligations: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 2,727.7 |  |  | $ | 2,805.9 |  |  | $ | 354.8 |  |  | $ | 400.8 |
Service cost |  | 14.1 |  |  | 20.6 |  |  | 2.4 |  |  | 2.6 |
Interest cost |  | 116.7 |  |  | 125.4 |  |  | 14.6 |  |  | 16.0 |
Benefits paid |  | (220.1 | ) |  | (255.4 | ) |  | (38.6 | ) |  | (47.7 | )
Subsidy paid |  | — |  |  | — |  |  | 0.6 |  |  | 0.8 |
Participant contributions |  | — |  |  | 0.2 |  |  | — |  |  | — |
Effect of currency rates |  | 7.4 |  |  | (17.3 | ) |  | — |  |  | — |
Net actuarial (gains) losses – discount rate change |  | 174.6 |  |  | 57.8 |  |  | 16.6 |  |  | 4.6 |
– other |  | 9.4 |  |  | (3.9 | ) |  | (0.5 | ) |  | (2.1 | )
Plan curtailments |  | — |  |  | (6.7 | ) |  | — |  |  | — |
Plan amendments |  | — |  |  | — |  |  | — |  |  | (22.5 | )
Special termination benefits |  | — |  |  | 1.1 |  |  | — |  |  | 2.3 |
Benefit obligation at end of year |  | $ | 2,829.8 |  |  | $ | 2,727.7 |  |  | $ | 349.9 |  |  | $ | 354.8 |
Schedule of changes in fair value of plan assets |
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 1,894.6 |  |  | $ | 1,962.3 |  |  | $ | 0.7 |  |  | $ | 1.8 |
Actual returns on plan assets and plan expenses |  | 304.1 |  |  | 79.7 |  |  | 0.2 |  |  | (0.8 | )
Employer contributions |  | 143.4 |  |  | 125.1 |  |  | — |  |  | — |
Participant contributions |  | — |  |  | 0.2 |  |  | — |  |  | — |
Effect of currency rates |  | 7.6 |  |  | (17.3 | ) |  | — |  |  | — |
Benefits paid |  | (220.1 | ) |  | (255.4 | ) |  | (0.3 | ) |  | (0.3 | )
Fair value of plan assets at end of year |  | $ | 2,129.6 |  |  | $ | 1,894.6 |  |  | $ | 0.6 |  |  | $ | 0.7 |
Schedule of amounts recognized in balance sheet |
Assets (liabilities) recognized in the consolidated balance sheets: |  |  |  |  |  |
|  | Pension Benefits |  | Other Postretirement Benefits
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Noncurrent assets |  | $ | 2.1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Current liabilities |  | (5.3 | ) |  | (5.2 | ) |  | (31.5 | ) |  | (36.4 | )
Noncurrent liabilities |  | (697.0 | ) |  | (827.9 | ) |  | (317.8 | ) |  | (317.7 | )
Total amount recognized |  | $ | (700.2 | ) |  | $ | (833.1 | ) |  | $ | (349.3 | ) |  | $ | (354.1 | )
Schedule of amounts recognized in other comprehensive income | Changes to accumulated other comprehensive loss related to pension and other postretirement benefit plans in 2017 and 2016 were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Beginning of year accumulated other comprehensive loss |  | $ | (1,462.7 | ) |  | $ | (1,418.2 | ) |  | $ | (74.4 | ) |  | $ | (101.4 | )
Amortization of net actuarial loss |  | 62.6 |  |  | 65.4 |  |  | 9.0 |  |  | 9.6 |
Amortization of prior service cost (credit) |  | 1.3 |  |  | 1.3 |  |  | (2.9 | ) |  | (1.7 | )
Remeasurements |  | (27.3 | ) |  | (111.2 | ) |  | (15.4 | ) |  | 19.1 |
End of year accumulated other comprehensive loss |  | $ | (1,426.1 | ) |  | $ | (1,462.7 | ) |  | $ | (83.7 | ) |  | $ | (74.4 | )
Net change in accumulated other comprehensive loss |  | $ | 36.6 |  |  | $ | (44.5 | ) |  | $ | (9.3 | ) |  | $ | 27.0 |
Schedule of net periodic benefit cost not yet recognized | Amounts included in accumulated other comprehensive loss at December 31, 2017 and 2016 were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
(In millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Prior service (cost) credit |  | $ | (1.0 | ) |  | $ | (2.3 | ) |  | $ | 11.7 |  |  | $ | 14.6 |
Net actuarial loss |  | (1,425.1 | ) |  | (1,460.4 | ) |  | (95.4 | ) |  | (89.0 | )
Accumulated other comprehensive loss |  | (1,426.1 | ) |  | (1,462.7 | ) |  | (83.7 | ) |  | (74.4 | )
Deferred tax effect |  | 525.6 |  |  | 543.4 |  |  | 29.7 |  |  | 28.2 |
Accumulated other comprehensive loss, net of tax |  | $ | (900.5 | ) |  | $ | (919.3 | ) |  | $ | (54.0 | ) |  | $ | (46.2 | )
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 2018 are:
(In millions) |  | Pension Benefits |  | Other Postretirement Benefits |  | Total
Amortization of prior service cost (credit) |  | $ | 0.4 |  |  | $ | (2.9 | ) |  | $ | (2.5 | )
Amortization of net actuarial loss |  | 65.9 |  |  | 10.6 |  |  | 76.5 |
Amortization of accumulated other comprehensive loss |  | $ | 66.3 |  |  | $ | 7.7 |  |  | $ | 74.0 |
Schedule of accumulated benefit obligations in excess of fair value of plan assets | Additional information for pension plans with accumulated benefit obligations in excess of plan assets:
|  | Pension Benefits
(In millions) |  | 2017 |  | 2016
Projected benefit obligation |  | $ | 2,737.4 |  |  | $ | 2,727.7 |
Accumulated benefit obligation |  | $ | 2,718.0 |  |  | $ | 2,710.7 |
Fair value of plan assets |  | $ | 2,035.1 |  |  | $ | 1,894.6 |
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 2027, 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 ATI Pension Plan and the U.K. defined benefit plan are made from pension plan assets.
(In millions) |  | Pension Benefits |  | Other Postretirement Benefits |  | Medicare Part D Subsidy
2018 |  | $ | 201.0 |  |  | $ | 32.1 |  |  | $ | 0.8 |
2019 |  | 194.1 |  |  | 31.2 |  |  | 0.8 |
2020 |  | 192.0 |  |  | 29.7 |  |  | 0.8 |
2021 |  | 188.8 |  |  | 28.1 |  |  | 0.7 |
2022 |  | 186.8 |  |  | 26.2 |  |  | 0.7 |
2023 - 2027 |  | 891.5 |  |  | 109.0 |  |  | 2.8 |
Schedule of effect of one-percentage-point change in assumed health care cost trend rates | A one percentage point change in assumed health care cost trend rates would have the following effects:
(In millions) |  | One Percentage Point Increase |  | One Percentage Point Decrease
Effect on total of service and interest cost components for the year ended December 31, 2017 |  | $ | 0.3 |  |  | $ | (0.3 | )
Effect on other postretirement benefit obligation at December 31, 2017 |  | $ | 5.7 |  |  | $ | (5.1 | )
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 10. The fair values at December 31, 2017 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: |  |  |  |  |  |  |  |  |  |
ATI common stock |  | $ | 71.3 |  |  | $ | — |  |  | $ | 71.3 |  |  | $ | — |  |  | $ | — |
Other U.S. equities |  | 416.0 |  |  | 267.7 |  |  | 148.3 |  |  | — |  |  | — |
International equities |  | 432.5 |  |  | 385.9 |  |  | 46.6 |  |  | — |  |  | — |
Global debt securities and cash: |  |  |  |  |  |  |  |  |  |
Fixed income and cash equivalents |  | 501.1 |  |  | 92.6 |  |  | 10.0 |  |  | 398.5 |  |  | — |
Floating rate |  | 169.9 |  |  | 122.6 |  |  | 47.3 |  |  | — |  |  | — |
Private equity |  | 137.5 |  |  | 137.5 |  |  | — |  |  | — |  |  | — |
Hedge funds |  | 307.4 |  |  | 307.4 |  |  | — |  |  | — |  |  | — |
Real estate and other |  | 93.9 |  |  | 90.7 |  |  | — |  |  | 3.2 |  |  | — |
Total assets |  | $ | 2,129.6 |  |  | $ | 1,404.4 |  |  | $ | 323.5 |  |  | $ | 401.7 |  |  | $ | — |
The fair values of the Company’s pension plan assets at December 31, 2016 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: |  |  |  |  |  |  |  |  |  |
ATI common stock |  | $ | 47.1 |  |  | $ | — |  |  | $ | 47.1 |  |  | $ | — |  |  | $ | — |
Other U.S. equities |  | 311.1 |  |  | 204.0 |  |  | 107.1 |  |  | — |  |  | — |
International equities |  | 375.7 |  |  | 339.2 |  |  | 36.5 |  |  | — |  |  | — |
Global debt securities and cash: |  |  |  |  |  |  |  |  |  |
Fixed income and cash equivalents |  | 412.2 |  |  | 82.3 |  |  | 0.5 |  |  | 329.2 |  |  | 0.2 |
Floating rate |  | 225.5 |  |  | 225.5 |  |  | — |  |  | — |  |  | — |
Private equity |  | 142.6 |  |  | 142.6 |  |  | — |  |  | — |  |  | — |
Hedge funds |  | 283.9 |  |  | 283.9 |  |  | — |  |  | — |  |  | — |
Real estate and other |  | 96.5 |  |  | 91.5 |  |  | — |  |  | 5.0 |  |  | — |
Total assets |  | $ | 1,894.6 |  |  | $ | 1,369.0 |  |  | $ | 191.2 |  |  | $ | 334.2 |  |  | $ | 0.2 |
Changes in fair value of level 3 plan investments | The fair value of Level 3 pension plan assets for the year ended December 31, 2017 was not material. Changes in the fair value of Level 3 pension plan assets for the year ended December 31, 2016 were as follows:
(In millions) |  | January 1, 2016 Balance |  | Net Realized and Unrealized Gains (Losses) |  | Net Purchases, Issuances and Settlements |  | Net Transfers Into (Out Of) Level 3 |  | December 31, 2016 Balance
Global debt securities and cash: |  |  |  |  |  |  |  |  |  |
Fixed income and cash equivalents |  | $ | 0.3 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | — |  |  | $ | 0.2 |
Floating rate debt |  | 194.3 |  |  | 4.8 |  |  | (199.1 | ) |  | — |  |  | — |
Total |  | $ | 194.6 |  |  | $ | 4.8 |  |  | $ | (199.2 | ) |  | $ | — |  |  | $ | 0.2 |
Schedule of target asset allocations for pension plans | The target asset allocations for pension plans for 2018, by major investment category, are:
Asset category |  | Target asset allocation range
Equity securities: |  |
U. S. equities |  | 18% - 40%
International equities |  | 10% - 30%
Global debt securities and cash |  | 15% - 40%
Private equity |  | 0% - 15%
Hedge funds |  | 10% - 20%
Real estate and other |  | 0% - 10%
Schedule of multiemployer plans | The Company’s participation in multiemployer plans for the years ended December 31, 2017, 2016 and 2015 is reported in the following table. The Company’s contributions to the Steelworkers Western Independent Shops Pension Plan exceed 5% of this plan’s total contributions for the plan year ended September 30, 2016, which is the most recent information available from the Plan Administrator.
|  |  |  | 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 |  |  | 2017 |  | 2016 |  |  | 2017 |  | 2016 |  | 2015 |  |
Steelworkers Western Independent Shops Pension Plan |  | 90-0169564 / 001 |  | Green |  | Green |  | N/A |  | $ | 0.6 |  |  | $ | 1.2 |  |  | $ | 0.7 |  |  | No |  | 2/29/2020
Boilermakers-Blacksmiths National Pension Trust |  | 48-6168020 / 001 |  | Yellow |  | Yellow |  | Yes |  | 2.2 |  |  | 1.8 |  |  | 1.8 |  |  | No |  | 9/30/2026
IAM National Pension Fund |  | 51-6031295 / 002 |  | Green |  | Green |  | N/A |  | 1.7 |  |  | 1.6 |  |  | 1.5 |  |  | No |  | Various between 2018-2022 (4)
Total contributions |  |  |  |  |  |  |  |  |  | $ | 4.5 |  |  | $ | 4.6 |  |  | $ | 4.0 |  |  |  |  |
(1) | The most recent Pension Protection Act Zone Status available for ATI’s fiscal years 2017 and 2016 is for plan years ending in calendar years 2016 and 2015, respectively. The zone status is based on information provided to ATI and other participating employers by each plan and is certified by the plan’s actuary. 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.
(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” zone, is pending or has been implemented as of the end of the plan year that ended in 2017.
(3) | The “Surcharge Imposed” column indicates whether ATI’s contribution rate for 2017 included an amount in addition to the contribution rate specified in the applicable collective bargaining agreement, as imposed by a plan in “critical 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 April 22, 2018 and February 27, 2022.

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation at the year end valuation date, including assumed discount rates and rate increase in compensation increase + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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