Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization to net income of net prior service credits	$ (0.2)	$ (0.1)	$ (0.4)	$ (0.4)
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses	1.2	1.3	3.8	3.9
Income tax provision	31.0	28.3	81.3	70.5
Reclassification adjustment included in net income	0.0	0.0	5.1	0.0
Sales	1,125.5	1,051.2	3,410.3	3,189.4
Cost of sales	870.2	826.4	2,676.7	2,539.8
Interest expense	26.1	28.0	74.5	83.0
Reclassification out of Accumulated Other Comprehensive Income | Post- retirement benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization to net income of net prior service credits	0.2	0.1	0.4	0.4
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses	1.2	1.3	3.8	3.9
Income before income taxes	(1.0)	(1.2)	(3.4)	(3.5)
Income tax provision	(0.1)	(0.3)	(0.8)	(0.8)
Net income (loss)	(0.9)	(0.9)	(2.6)	(2.7)
Reclassification out of Accumulated Other Comprehensive Income | Currency translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment included in net income	0.0	0.0	(5.1)	0.0
Reclassification out of Accumulated Other Comprehensive Income | Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(1.8)	(3.7)	(4.4)	(8.0)
Income tax provision	(0.4)	(0.9)	(1.0)	(1.9)
Net income (loss)	(1.4)	(2.8)	(3.4)	(6.1)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Nickel and other raw material contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales	(1.4)	(1.9)	(4.3)	(3.3)
Cost of sales	(1.4)	(1.9)	(4.3)	(3.3)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Natural gas contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(0.4)	(1.8)	(0.2)	(6.5)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Foreign Exchange
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	0.0	0.0	0.1	0.2
Reclassification out of Accumulated Other Comprehensive Income | Derivatives | Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 0.0	$ 0.0	$ 0.0	$ 1.6