Consolidated Condensed Statements Of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Income Statement [Abstract]
Sales	$ 659.3	$ 679.5	$ 2,031.1	$ 2,085.5
Cost of sales	(292.3)	(298.6)	(907.4)	(905.9)
Gross profit	367.0	380.9	1,123.7	1,179.6
Operating costs:
Selling, general and administrative expenses	(252.0)	(257.2)	(804.9)	(820.4)
Research and development expenses	(36.3)	(42.3)	(119.3)	(128.4)
Operating profit	78.7	81.4	199.5	230.8
Nonoperating income (expense):
Other income	0.2	1.5	1.6	1.9
Interest expense, net	(0.2)	0.0	(0.2)	0.0
Earnings before income taxes	78.7	82.9	200.9	232.7
Income taxes	(16.6)	(18.8)	(39.4)	(53.2)
Net earnings	$ 62.1	$ 64.1	$ 161.5	$ 179.5
Net earnings per share:
Basic (in USD per share)	$ 0.48	$ 0.50	$ 1.25	$ 1.40
Diluted (in USD per share)	$ 0.48	$ 0.50	$ 1.25	$ 1.40
Average common stock and common equivalent shares outstanding:
Basic (in shares)	130.6	127.9	128.8	127.9
Diluted (in shares)	130.6	127.9	128.8	127.9