v3.26.1
Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2026
Jun. 29, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Nonoperating retirement benefit expense $ (4.3) $ (4.1) $ (8.6) $ (8.0)
Cost of sales (951.3) (897.9) (1,839.9) (1,806.5)
Interest expense, net (23.9) (25.4) (47.6) (48.4)
Income before income taxes 192.9 133.3 329.5 254.8
Income tax expense (benefit) 38.6 29.3 54.7 50.3
Net income 154.3 104.0 274.8 204.5
Reclassification out of Accumulated Other Comprehensive Income | Postretirement benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes (1.3) (1.2) (2.7) (2.4)
Income tax expense (benefit) (0.2) (0.4) (0.6) (0.7)
Net income (1.1) (0.8) (2.1) (1.7)
Reclassification out of Accumulated Other Comprehensive Income | Prior service (cost) credit        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Nonoperating retirement benefit expense 0.0 0.1 (0.1) 0.2
Reclassification out of Accumulated Other Comprehensive Income | Actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Nonoperating retirement benefit expense (1.3) (1.3) (2.6) (2.6)
Reclassification out of Accumulated Other Comprehensive Income | Currency translation adjustment        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 0.0 0.0 0.0 (5.1)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes 0.4 (1.6) 3.3 (2.6)
Income tax expense (benefit) 0.1 (0.4) 0.8 (0.6)
Net income 0.3 (1.2) 2.5 (2.0)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Nickel and other raw material contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales 1.5 (1.6) 2.0 (2.9)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Natural gas contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales (1.2) 0.0 0.9 0.2
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Foreign exchange contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales $ 0.1 $ 0.0 $ 0.4 $ 0.1