Segment Information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 26, 2025	Sep. 27, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Sales	$ 669.9	$ 601.0	$ 1,968.9	$ 1,857.7
Operating profit (loss)	57.5	20.9	142.8	(1,084.3)
Nonoperating other income, net	1.4	0.6	3.1	(0.4)
Interest expense, net	(9.0)	(11.9)	(26.3)	(36.5)
Income (loss) before income taxes	49.9	9.6	119.6	(1,121.2)
Depreciation and amortization	29.2	29.2	86.9	95.3
Capital expenditures, gross	11.3	8.3	29.7	26.3
Identifiable assets	5,642.5		5,642.5		$ 5,350.5
Operating segments
Segment Reporting Information [Line Items]
Sales	669.9	601.0	1,968.9	1,857.7
Expenses	580.3	550.1	1,728.4	1,694.5
Operating profit (loss)	89.6	50.9	240.5	163.2
Corporate and other
Segment Reporting Information [Line Items]
Operating profit (loss)	(32.1)	(30.0)	(97.7)	(1,247.5)
Depreciation and amortization	0.4	0.4	1.2	1.7
Capital expenditures, gross	0.5	1.4	0.6	3.0
Identifiable assets	1,174.3		1,174.3		1,112.1
Specialty Products & Technologies
Segment Reporting Information [Line Items]
Sales	431.5	381.7	1,276.9	1,205.5
Specialty Products & Technologies | Operating segments
Segment Reporting Information [Line Items]
Sales	431.5	381.7	1,276.9	1,205.5
Expenses	383.4	369.4	1,145.9	1,143.0
Operating profit (loss)	48.1	12.3	131.0	62.5
Depreciation and amortization	21.8	21.7	64.4	64.8
Capital expenditures, gross	6.6	4.8	17.0	16.6
Identifiable assets	2,548.6		2,548.6		2,354.2
Equipment & Consumables
Segment Reporting Information [Line Items]
Sales	238.4	219.3	692.0	652.2
Equipment & Consumables | Operating segments
Segment Reporting Information [Line Items]
Sales	238.4	219.3	692.0	652.2
Expenses	196.9	180.7	582.5	551.5
Operating profit (loss)	41.5	38.6	109.5	100.7
Depreciation and amortization	7.0	7.1	21.3	28.8
Capital expenditures, gross	4.2	$ 2.1	12.1	$ 6.7
Identifiable assets	$ 1,919.6		$ 1,919.6		$ 1,884.2