Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 29, 2018		Sep. 30, 2017	Sep. 29, 2018		Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,133.1	[1]	$ 1,231.3	$ 3,536.5	[1]	$ 3,663.1
Cost of sales	708.3		733.5	2,148.0		2,196.4
Gross profit	424.8		497.8	1,388.5		1,466.7
Operating expenses
Distribution	22.5		21.5	71.0		64.2
Research and development	43.7		38.4	174.0		120.8
Selling	134.7		143.5	451.2		454.1
Administration	105.6		123.3	310.0		326.9
Impairment charges	221.8		7.8	223.5		47.4
Restructuring charges	18.0		3.8	23.2		54.7
Other operating expense (income)	0.5		(2.9)	6.6		(41.0)
Total operating expenses	546.8		335.4	1,259.5		1,027.1
Operating income (loss)	(122.0)		162.4	129.0		439.6
Change in financial assets	(74.9)		2.6	(65.9)		24.2
Interest expense, net	31.7		34.7	95.2		133.1
Other (income) expense, net	0.2		(3.6)	12.3		(1.1)
Loss on extinguishment of debt	0.0		0.0	0.5		135.2
Income (loss) before income taxes	(79.0)		128.7	86.9		148.2
Income tax expense (benefit)	(11.5)		84.2	37.3		101.8
Net income (loss)	$ (67.5)		$ 44.5	$ 49.6		$ 46.4
Earnings (loss) per share
Basic (in dollars per share)	$ (0.49)		$ 0.31	$ 0.36		$ 0.33
Diluted (in dollars per share)	$ (0.49)		$ 0.31	$ 0.36		$ 0.32
Weighted-average shares outstanding
Basic (in shares)	137.4		141.3	138.5		142.5
Diluted (in shares)	137.4		141.7	139.0		142.8
Dividends declared per share (in dollars per share)	$ 0.19		$ 0.16	$ 0.57		$ 0.48

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