Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	[1]	$ 1,149.0	$ 1,186.4	$ 2,323.5	$ 2,403.4
Cost of sales		718.2	715.4	1,443.9	1,439.7
Gross profit		430.8	471.0	879.6	963.7
Operating expenses
Distribution		23.7	23.8	47.1	48.5
Research and development		43.9	91.9	84.0	130.3
Selling		140.1	155.2	288.7	316.5
Administration		127.2	96.8	252.3	204.5
Impairment charges		27.8	1.7	31.9	1.7
Restructuring		12.2	3.7	21.5	5.2
Other operating expense (income)		0.9	3.2	(3.2)	6.1
Total operating expenses		375.8	376.3	722.3	712.8
Operating income		55.0	94.7	157.3	250.9
Change in financial assets		(5.5)	(0.6)	(15.9)	9.0
Interest expense, net		31.2	32.1	59.8	63.5
Other (income) expense, net		2.3	7.9	5.5	12.1
Loss on extinguishment of debt		0.0	0.0	0.0	0.5
Income before income taxes		27.0	55.3	107.9	165.8
Income tax expense		18.0	19.1	35.0	48.8
Net income		$ 9.0	$ 36.2	$ 72.9	$ 117.0
Earnings per share
Basic (in dollars per share)		$ 0.07	$ 0.26	$ 0.54	$ 0.84
Diluted (in dollars per share)		$ 0.07	$ 0.26	$ 0.54	$ 0.84
Weighted-average shares outstanding
Basic (in shares)		136.0	138.1	136.0	139.5
Diluted (in shares)		136.5	138.7	136.3	140.0

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