Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Statement [Abstract]
Net sales	$ 725.3	$ 662.2	$ 2,153.4	$ 1,899.4
Costs and expenses
Cost of sales	446.2	408.6	1,331.4	1,186.8
Selling, general and administrative expenses	173.6	164.1	516.6	485.5
Total costs and expenses	619.8	572.7	1,848.0	1,672.3
Operating income	105.5	89.5	305.4	227.1
Interest and debt expense, net	(6.0)	(8.2)	(19.8)	(25.5)
Non-service retirement benefit income	3.4	3.4	10.1	10.1
Other expense, net	(2.7)	(3.0)	(8.9)	(13.0)
Income before income taxes	100.2	81.7	286.8	198.7
Provision for income taxes	9.9	12.7	44.1	39.1
Net income	$ 90.3	$ 69.0	$ 242.7	$ 159.6
Basic earnings per common share:
Basic earnings per common share (in USD per share)	$ 2.52	$ 1.95	$ 6.80	$ 4.53
Weighted average basic common shares outstanding (in shares)	35.9	35.3	35.7	35.2
Diluted earnings per common share:
Diluted earnings per common share (in USD per share)	$ 2.43	$ 1.90	$ 6.56	$ 4.41
Weighted average diluted common shares outstanding (in shares)	37.2	36.4	37.0	36.2