Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 743.3	$ 782.0	$ 1,527.9	$ 1,527.2
Costs and expenses
Cost of sales	460.6	463.6	953.2	927.5
Selling, general and administrative expenses	172.9	186.5	360.9	370.5
Total costs and expenses	633.5	650.1	1,314.1	1,298.0
Operating income	109.8	131.9	213.8	229.2
Interest and debt expense, net	(3.7)	(5.4)	(7.8)	(10.8)
Non-service retirement benefit income	3.2	2.0	5.7	4.2
Other expense, net	(1.4)	(0.6)	(2.8)	(1.8)
Income before income taxes	107.9	127.9	208.9	220.8
Provision for income taxes	14.2	23.3	33.0	40.9
Net income	$ 93.7	$ 104.6	$ 175.9	$ 179.9
Basic earnings per common share (in USD per share)	$ 2.55	$ 2.89	$ 4.81	$ 4.97
Weighted average common shares outstanding (in shares)	36.7	36.2	36.6	36.2
Diluted earnings per common share (in USD per share)	$ 2.48	$ 2.80	$ 4.65	$ 4.82
Weighted average diluted common shares outstanding (in shares)	37.8	37.4	37.8	37.3