Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Income Statement [Abstract]
Net sales	$ 1,217.0	$ 1,194.0
Cost of sales	724.3	729.6
Gross profit	492.7	464.4
Operating expenses
Distribution	24.7	21.1
Research and development	38.4	39.8
Selling	161.3	155.0
Administration	107.6	105.4
Impairment charges	0.0	12.2
Restructuring charges	1.5	38.7
Other operating loss (income)	2.9	(36.3)
Total operating expenses	336.4	335.9
Operating income	156.3	128.5
Change in financial assets	9.6	(17.1)
Interest expense, net	31.4	53.3
Other expense (income), net	4.3	(3.5)
Loss on extinguishment of debt	0.5	0.0
Income before income taxes	110.5	95.8
Income tax expense	29.7	24.2
Net income	$ 80.8	$ 71.6
Earnings per share
Basic (in dollars per share)	$ 0.57	$ 0.50
Diluted (in dollars per share)	$ 0.57	$ 0.50
Weighted-average shares outstanding
Basic (in shares)	140.8	143.4
Diluted (in shares)	141.4	143.6
Dividends declared per share (in dollars per share)	$ 0.19	$ 0.16