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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Summary of the Effect of Change in the Accounting Principle on the Consolidated Financial Statements
The following table reflects the effect of the change in the accounting principle on the consolidated financial statements:

For the Fiscal Year Ending December 31, 2023As Computed Under Previous PolicyAs Reported under New PolicyEffect of Accounting Change
(dollars in millions, except per share data)
Statement of Operations
Nonoperating retirement benefit expense$(1,036.6)$(79.7)$956.9 
Income (loss) before income taxes$(661.7)$295.2 $956.9 
Income tax benefit$(342.5)$(128.2)$214.3 
Net income (loss)$(319.2)$423.4 $742.6 
Net income (loss) attributable to ATI$(331.8)$410.8 $742.6 
Basic net income (loss) per common share$(2.59)$3.21 $5.80 
Diluted net income (loss) per common share$(2.59)$2.81 $5.40 
Statement of Comprehensive Income (Loss)
Net income (loss)$(319.2)$423.4 $742.6 
Postretirement benefit plans
Actuarial gain/ loss
Amortization of net actuarial loss$55.7 $6.0 $(49.7)
Net loss arising during the period$(71.4)$(3.8)$67.6 
Settlement loss included in net income (loss)$975.9 $1.1 $(974.8)
Income taxes on postretirement benefits$214.6 $0.3 $(214.3)
Total$745.0 $2.4 $(742.6)
Other comprehensive income (loss), net of tax$726.4 $(16.2)$(742.6)
Balance Sheet
Retained loss$(154.9)$(70.1)$84.8 
Accumulated other comprehensive income (loss), net of tax$1.6 $(83.2)$(84.8)
Statement of Cash Flows
Operating Activities:
Net income (loss)$(319.2)$423.4 $742.6 
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Deferred taxes$(352.5)$(138.2)$214.3 
Change in operating assets and liabilities:
Retirement benefits$1,010.7 $53.8 $(956.9)
Statements of Changes in Consolidated Equity
Retained Loss
Net income (loss)$(331.8)$410.8 $742.6 
Balance, December 31, 2023$(154.9)$(70.1)$84.8 
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income (loss)$726.8 $(15.8)$(742.6)
Balance, December 31, 2023$1.6 $(83.2)$(84.8)
Total Equity
Net income (loss)$(319.2)$423.4 $742.6 
Other comprehensive income (loss)$726.4 $(16.2)$(742.6)
For the Fiscal Year Ending January 1, 2023As Computed Under Previous PolicyAs Reported under New PolicyEffect of Accounting Change
(dollars in millions, except per share data)
Statement of Operations
Loss on asset sales and sales of businesses, net$134.2 $105.4 $(28.8)
Operating income$287.3 $316.1 $28.8 
Nonoperating retirement benefit income (expense)$(25.4)$138.4 $163.8 
Income before income taxes$162.0 $354.6 $192.6 
Net income$146.5 $339.1 $192.6 
Net income attributable to ATI$130.9 $323.5 $192.6 
Basic net income per common share$1.03 $2.54 $1.51 
Diluted net income per common share$0.96 $2.23 $1.27 
Statement of Comprehensive Income (Loss)
Net income$146.5 $339.1 $192.6 
Postretirement benefit plans
Actuarial gain/loss
Amortization of net actuarial loss$76.7 $13.2 $(63.5)
Net gain arising during the period$155.0 $54.7 $(100.3)
Settlement loss included in net income$29.5 $0.7 $(28.8)
Total$260.7 $68.1 $(192.6)
Other comprehensive income, net of tax$248.2 $55.6 $(192.6)
Balance Sheet
Retained earnings (loss)$176.9 $(480.9)$(657.8)
Accumulated other comprehensive loss, net of tax$(725.2)$(67.4)$657.8 
Statement of Cash Flows
Operating Activities:
Net income$146.5 $339.1 $192.6 
Adjustments to reconcile net income to net cash provided by operating activities:
Net loss from sales of businesses$141.0 $112.2 $(28.8)
Change in operating assets and liabilities:
Retirement benefits$4.6 $(159.2)$(163.8)
Statements of Changes in Consolidated Equity
Retained Earnings (Loss)
Net income$130.9 $323.5 $192.6 
Balance, January 1, 2023$176.9 $(480.9)$(657.8)
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income$266.5 $73.9 $(192.6)
Balance, January 1, 2023$(725.2)$(67.4)$657.8 
Total Equity
Net income$146.5 $339.1 $192.6 
Other comprehensive income$248.2 $55.6 $(192.6)
For the Fiscal Year Ending January 2, 2022As Computed Under Previous PolicyAs Reported under New PolicyEffect of Accounting Change
(dollars in millions, except per share data)
Statement of Operations
Nonoperating retirement benefit income$37.2 $260.0 $222.8 
Income before income taxes$10.6 $233.4 $222.8 
Net income (loss)$(16.2)$206.6 $222.8 
Net income (loss) attributable to ATI$(38.2)$184.6 $222.8 
Basic net income (loss) per common share$(0.30)$1.45 $1.75 
Diluted net income (loss) per common share$(0.30)$1.32 $1.62 
Statement of Comprehensive Income (Loss)
Net income (loss)$(16.2)$206.6 $222.8 
Postretirement benefit plans
Actuarial gain/loss
Amortization of net actuarial loss$89.5 $13.9 $(75.6)
Net gain arising during the period$155.9 $8.7 $(147.2)
Total$237.2 $14.4 $(222.8)
Other comprehensive income, net of tax$236.7 $13.9 $(222.8)
Balance Sheet
Retained earnings (loss)$72.7 $(777.7)$(850.4)
Accumulated other comprehensive loss, net of tax$(991.7)$(141.3)$850.4 
Statement of Cash Flows
Operating Activities:
Net income (loss)$(16.2)$206.6 $222.8 
Change in operating assets and liabilities:
Retirement benefits$(39.1)$(261.9)$(222.8)
Statements of Changes in Consolidated Equity
Retained Earnings (Loss)
Net income (loss)$(38.2)$184.6 $222.8 
Cumulative effect of change in accounting principle$— $(1,073.2)$(1,073.2)
Balance, January 2, 2022$72.7 $(777.7)$(850.4)
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income$231.9 $9.1 $(222.8)
Cumulative effect of change in accounting principle$— $1,073.2 $1,073.2 
Balance, January 2, 2022$(991.7)$(141.3)$850.4 
Total Equity
Net income (loss)$(16.2)$206.6 $222.8 
Other comprehensive income$236.7 $13.9 $(222.8)
Below reflects the quarterly impact of the change in accounting principle on our quarterly financial data presented:
(dollars in millions, except per share data)As Computed Under Previous PolicyAs Reported Under New PolicyEffect of Accounting Change
Three months ended April 2, 2023
Net income$72.2 $86.6 $14.4 
Net income attributable to ATI$70.1 $84.5 $14.4 
Basic income attributable to ATI per common share*$0.55 $0.66 $0.11 
Diluted income attributable to ATI per common share*$0.48 $0.58 $0.10 
Three months ended July 2, 2023
Net income$79.1 $93.5 $14.4 
Net income attributable to ATI$76.0 $90.4 $14.4 
Basic income attributable to ATI per common share*$0.59 $0.70 $0.11 
Diluted income attributable to ATI per common share*$0.52 $0.62 $0.10 
Three months ended October 1, 2023
Net income$79.6 $94.1 $14.5 
Net income attributable to ATI$75.7 $90.2 $14.5 
Basic income attributable to ATI per common share*$0.59 $0.70 $0.11 
Diluted income attributable to ATI per common share*$0.52 $0.62 $0.10 
Three months ended December 31, 2023
Net income (loss)$(550.1)$149.2 $699.3 
Net income (loss) attributable to ATI$(553.6)$145.7 $699.3 
Basic income (loss) attributable to ATI per common share*$(4.35)$1.15 $5.50 
Diluted income (loss) attributable to ATI per common share*$(4.35)$0.99 $5.34 
(dollars in millions, except per share data)As Computed Under Previous PolicyAs Reported Under New PolicyEffect of Accounting Change
Three months ended April 3, 2022
Net income$35.2 $51.2 $16.0 
Net income attributable to ATI$30.9 $46.9 $16.0 
Basic income attributable to ATI per common share*$0.24 $0.37 $0.13 
Diluted income attributable to ATI per common share*$0.23 $0.33 $0.10 
Three months ended July 3, 2022
Operating income (loss)$(11.6)$17.2 $28.8 
Net income (loss)$(34.3)$10.4 $44.7 
Net income (loss) attributable to ATI$(38.0)$6.7 $44.7 
Basic income (loss) attributable to ATI per common share*$(0.31)$0.05 $0.36 
Diluted income (loss) attributable to ATI per common share*$(0.31)$0.05 $0.36 
Three months ended October 2, 2022
Net income$64.4 $80.2 $15.8 
Net income attributable to ATI$61.1 $76.9 $15.8 
Basic income attributable to ATI per common share*$0.47 $0.59 $0.12 
Diluted income attributable to ATI per common share*$0.42 $0.53 $0.11 
Three months ended January 1, 2023
Net income$81.2 $197.3 $116.1 
Net income attributable to ATI$76.9 $193.0 $116.1 
Basic income attributable to ATI per common share*$0.60 $1.49 $0.89 
Diluted income attributable to ATI per common share*$0.53 $1.30 $0.77 
* The sum of quarterly earnings per share may not equal the annual earnings per share due to changes in the weighted-average shares between periods and the dilutive effect of dilutive share equivalents.