Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2026	Mar. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating retirement benefit expense	$ (4.3)	$ (3.9)
Cost of sales	(888.6)	(908.6)
Interest expense, net	(23.7)	(23.0)
Income before income taxes	136.6	121.5
Income tax expense (benefit)	16.1	21.0
Net income	120.5	100.5
Reclassification out of Accumulated Other Comprehensive Income | Postretirement benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(1.4)	(1.2)
Income tax expense (benefit)	(0.4)	(0.3)
Net income	(1.0)	(0.9)
Reclassification out of Accumulated Other Comprehensive Income | Prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating retirement benefit expense	(0.1)	0.1
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)
Reclassification out of Accumulated Other Comprehensive Income | Currency translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	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	2.9	(1.0)
Income tax expense (benefit)	0.7	(0.2)
Net income	2.2	(0.8)
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	0.5	(1.3)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Natural gas contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	2.1	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	0.3	0.1
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Interest rate swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ 0.0	$ 0.0