Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Net sales	[1]	$ 1,213.7	$ 1,191.1	$ 3,773.8	$ 3,514.6
Cost of sales		785.6	778.3	2,427.8	2,222.1
Gross profit		428.1	412.8	1,346.0	1,292.5
Operating expenses
Distribution		26.1	23.4	73.8	70.5
Research and development		42.6	44.0	131.6	128.0
Selling		138.5	134.1	413.9	422.8
Administration		116.4	131.9	357.8	384.2
Impairment charges		202.4	10.9	202.4	42.9
Restructuring		0.8	5.2	1.9	26.7
Other operating expense (income)		(3.2)	8.9	(3.0)	5.7
Total operating expenses		523.6	358.4	1,178.4	1,080.8
Operating income (loss)		(95.5)	54.4	167.6	211.7
Change in financial assets		(22.2)	(2.6)	(25.9)	(18.5)
Interest expense, net		34.0	30.5	97.6	90.4
Other (income) expense, net		0.4	(71.0)	17.1	(65.6)
Loss on extinguishment of debt		20.0	0.2	20.0	0.2
Income (loss) before income taxes		(127.7)	97.3	58.8	205.2
Income tax expense		26.9	5.1	46.4	40.1
Net income (loss)		$ (154.6)	$ 92.2	$ 12.4	$ 165.1
Earnings (loss) per share
Basic (in dollars per share)		$ (1.13)	$ 0.68	$ 0.09	$ 1.21
Diluted (in dollars per share)		$ (1.13)	$ 0.67	$ 0.09	$ 1.21
Weighted-average shares outstanding
Basic (in shares)		136.5	136.0	136.3	136.0
Diluted (in shares)		136.5	136.8	137.5	136.4

[1] Derived from the location of the entity that sells to a third party.