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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 423.4 $ 339.1 $ 206.6
Currency translation adjustment      
Unrealized net change arising during the period 1.3 (43.5) (4.6)
Reclassification adjustment included in net income 0.0 20.0 0.0
Total 1.3 (23.5) (4.6)
Derivatives      
Net derivatives gain (loss) on hedge transactions (28.5) 53.8 15.5
Reclassification to net income of net realized loss (gain) 2.5 (42.8) (11.4)
Income taxes on derivative transactions (6.1) 0.0 0.0
Total (19.9) 11.0 4.1
Postretirement benefit plans- Actuarial gain/loss      
Amortization of net actuarial loss 6.0 13.2 13.9
Net gain (loss) arising during the period (3.8) 54.7 8.7
Postretirement benefit plans- Prior Service Cost      
Amortization to net income (loss) of net prior service credits (0.6) (0.5) (1.8)
Settlement loss (gain) included in net income (loss) 1.1 0.7 (21.9)
Income taxes on postretirement benefit plans 0.3 0.0 (15.5)
Total 2.4 68.1 14.4
Other comprehensive income (loss), net of tax (16.2) 55.6 13.9
Comprehensive income 407.2 394.7 220.5
Less: Comprehensive income (loss) attributable to noncontrolling interests 12.2 (2.7) 26.8
Comprehensive income attributable to ATI $ 395.0 $ 397.4 $ 193.7