Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 3,839.6	$ 3,641.6	$ 3,467.4
Cost of goods sold	2,714.4	2,565.1	2,520.0
Gross profit	1,125.2	1,076.5	947.4
Operating expenses:
Selling, general and administrative expenses	637.7	621.0	580.5
Losses and other expenses, net	8.2	11.3	21.7
Restructuring charges	3.2	1.8	3.2
Goodwill impairment	0.0	0.0	5.5
Asset impairment	0.0	0.0	44.5
Pension settlement	0.0	31.4	0.0
Income from equity method investments	(18.4)	(18.4)	(13.4)
Operating income	494.5	429.4	305.4
Interest expense, net	30.6	27.0	23.6
Other income, net	(0.1)	(0.3)	(0.8)
Income from continuing operations before income taxes	464.0	402.7	282.6
Provision for income taxes	156.9	124.1	95.4
Income from continuing operations	307.1	278.6	187.2
Discontinued operations:
Loss from discontinued operations before income taxes	(2.2)	(1.3)	(1.0)
Benefit from income taxes	(0.8)	(0.5)	(0.4)
Loss from discontinued operations	(1.4)	(0.8)	(0.6)
Net income	$ 305.7	$ 277.8	$ 186.6
Earnings per share – Basic:
Income from continuing operations (in usd per share)	$ 7.28	$ 6.41	$ 4.17
Loss from discontinued operations (in usd per share)	(0.03)	(0.02)	(0.01)
Net income (in usd per share)	7.25	6.39	4.16
Earnings per share – Diluted:
Income from continuing operations (in usd per share)	7.17	6.34	4.11
Loss from discontinued operations (in usd per share)	(0.03)	(0.02)	(0.02)
Net income (in usd per share)	$ 7.14	$ 6.32	$ 4.09
Average shares outstanding:
Basic (in shares)	42.2	43.4	44.9
Diluted (in shares)	42.8	44.0	45.6
Cash dividends declared per share (in usd per share)	$ 1.96	$ 1.65	$ 1.38