Discontinued Operations - Results of Discontinued Operations (Details) - Discontinued Operations, Disposed of by Sale - RX - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 204.5	$ 270.4	$ 404.5	$ 528.1
Cost of sales	119.9	180.6	258.2	346.4
Gross profit	84.6	89.8	146.3	181.7
Distribution	2.8	3.8	6.1	7.8
Research and development	17.3	16.4	30.6	30.1
Selling	8.8	7.4	16.2	14.7
Administration	12.4	8.1	30.6	14.5
Restructuring	0.0	0.4	0.0	0.4
Other operating expense (income)	0.5	(0.9)	(0.4)	0.2
Total operating expenses	41.8	35.2	83.1	67.7
Operating income (loss)	42.8	54.6	63.2	114.0
Interest expense, net	0.2	1.1	0.8	2.5
Other (income) expense, net	(0.2)	(2.9)	(1.7)	(2.1)
Income before income taxes	42.8	56.4	64.1	113.6
Income tax expense (benefit)	(11.4)	8.2	(25.4)	16.7
Income from discontinued operations, net of tax	$ 54.2	$ 48.2	$ 89.5	$ 96.9