Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization to net income of net prior service credits	$ (0.1)	$ (0.1)	$ (0.4)	$ (0.4)
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses	1.3	1.5	3.9	4.5
Income before income taxes	114.9	99.0	311.1	287.1
Income tax provision	28.3	4.9	70.5	12.9
Sales	1,051.2	1,025.6	3,189.4	3,109.7
Cost of sales	826.4	831.0	2,539.8	2,512.8
Reclassification out of Accumulated Other Comprehensive Income [Member] | Post- retirement benefit plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization to net income of net prior service credits	0.1	0.1	0.4	0.4
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses	(1.3)	(1.5)	(3.9)	(4.5)
Income before income taxes	(1.2)	(1.4)	(3.5)	(4.1)
Income tax provision	(0.3)	(0.4)	(0.8)	(1.0)
Net income (loss)	(0.9)	(1.0)	(2.7)	(3.1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(3.7)	(1.8)	(8.0)	(0.1)
Income tax provision	(0.9)	(0.4)	(1.9)	0.0
Net income (loss)	(2.8)	(1.4)	(6.1)	(0.1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Nickel and other raw material contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales	(1.9)	(0.5)	(3.3)	4.6
Cost of sales	(1.9)	(0.5)	(3.3)	4.6
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Natural gas contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(1.8)	(1.8)	(6.5)	(6.0)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Foreign Exchange
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	0.0	0.2	0.2	0.3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	$ 0.0	$ 0.3	$ 1.6	$ 1.0