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v3.25.0.1

Summary of Significant Accounting Policies - Change in Accounting Principle (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loss (gain) on asset sales and sales of businesses, net | $ (57.1) | $ 0.4 | $ 105.4 |
Operating Income (Loss) | 608.9 | 466.4 | 316.1 |
Nonoperating retirement benefit income (expense) | (29.0) | (79.7) | 138.4 |
Income tax provision (benefit) | 103.4 | (128.2) | 15.5 |
Net income | 382.7 | 423.4 | 339.1 |
Net loss (gain) from sales of businesses | (52.9) | 0.6 | 112.2 |
Net income attributable to ATI | $ 367.8 | $ 410.8 | $ 323.5 |
Basic net income (loss) attributable to ATI per common share (in dollars per share) | $ 2.82 | $ 3.21 | $ 2.54 |
Diluted net income (loss) attributable to ATI per common share (in dollars per share) | $ 2.55 | $ 2.81 | $ 2.23 |
Amortization of net actuarial loss | $ 5.2 | $ 6.0 | $ 13.2 |
Settlement loss (gain) included in net income (loss) | 0.0 | 1.1 | 0.7 |
Income taxes on postretirement benefit plans | 0.5 | 0.3 | 0.0 |
Total | 2.0 | 2.4 | 68.1 |
Other Comprehensive Income (Loss), Net of Tax | (7.9) | (16.2) | 55.6 |
Retained earnings (loss) | 64.3 | (70.1) |  |
Accumulated other comprehensive loss, net of tax | (89.5) | (83.2) | (67.4) | $ (141.3)
Deferred taxes | 86.4 | (138.2) | (0.1) |
Retirement benefits | 4.4 | 53.8 | (159.2) |
Stockholders' equity, including portion attributable to noncontrolling interest | 1,955.2 | 1,480.5 | 1,157.2 | 832.7
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net income | 367.8 | 410.8 | 323.5 |
Stockholders' equity, including portion attributable to noncontrolling interest | 64.3 | (70.1) | (480.9) | (777.7)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (6.3) | (15.8) | 73.9 |
Stockholders' equity, including portion attributable to noncontrolling interest | $ (89.5) | $ (83.2) | $ (67.4) | $ (141.3)

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