Segment Information - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Sales	$ 740.1	$ 362.0	$ 1,449.3	$ 909.2
Operating profit (loss)	98.5	(107.9)	206.8	(132.9)
Other income	0.3	0.1	0.6	0.2
Interest expense, net	(13.6)	(14.5)	(31.6)	(17.8)
Income (loss) before income taxes	85.2	(122.3)	175.8	(150.5)
Identifiable assets	6,481.3		6,481.3		$ 6,876.0
Other
Segment Reporting Information [Line Items]
Operating profit (loss)	(32.6)	(34.9)	(63.4)	(48.4)
Identifiable assets	588.4		588.4		924.5
Specialty Products & Technologies
Segment Reporting Information [Line Items]
Sales	386.2	184.6	752.7	457.2
Specialty Products & Technologies | Operating segments
Segment Reporting Information [Line Items]
Sales	386.2	184.6	752.7	457.2
Operating profit (loss)	74.1	(19.2)	154.6	(11.4)
Identifiable assets	3,692.3		3,692.3		3,773.3
Equipment & Consumables
Segment Reporting Information [Line Items]
Sales	353.9	177.4	696.6	452.0
Equipment & Consumables | Operating segments
Segment Reporting Information [Line Items]
Sales	353.9	177.4	696.6	452.0
Operating profit (loss)	57.0	$ (53.8)	115.6	$ (73.1)
Identifiable assets	$ 2,200.6		$ 2,200.6		$ 2,178.2