Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income
Net sales	$ 4,089.9	$ 3,675.4	$ 3,543.2
Cost of goods sold	2,941.9	2,518.1	2,536.5
Selling and administrative expenses	589.4	532.0	461.9
Research and development expenses	54.9	48.1	42.8
Impairment charges	0.0	141.5	0.0
Other operating (income) expense, net	(2.0)	(2.4)	(1.3)
Operating income	505.7	438.1	503.3
Interest expense, net	33.5	30.6	34.0
Other non-operating expense (income), net	4.0	(3.0)	1.4
Income from continuing operations before income taxes	468.2	410.5	467.9
Provision for income taxes	102.9	159.7	148.3
Income from continuing operations	365.3	250.8	319.6
Discontinued operations:
Income (loss) before income taxes	0.3	(1.1)	0.1
Income tax provision (benefit)	0.1	(0.4)	0.0
Income (loss) from discontinued operations	0.2	(0.7)	0.1
Net income	$ 365.5	$ 250.1	$ 319.7
Basic earnings per share attributable to common shares:
Income from continuing operations	$ 5.75	$ 3.87	$ 4.89
Loss from discontinued operations	0	(0.01)	0
Basic earnings per share	5.75	3.86	4.89
Diluted earnings per share attributable to common shares:
Income from continuing operations	5.71	3.83	4.82
Loss from discontinued operations	0	(0.01)	0
Diluted earnings per share	$ 5.71	$ 3.82	$ 4.82
Average shares outstanding (in thousands):
Basic (shares)	63,073	64,226	64,844
Diluted (shares)	63,551	64,883	65,804
Dividends declared and paid per share (in dollars per share)	$ 1.44	$ 1.30	$ 1.10
Comprehensive Income:
Net income	$ 365.5	$ 250.1	$ 319.7
Other comprehensive income (loss):
Change in foreign currency translation	46.6	(36.7)	(29.6)
Change in accrued post-retirement benefit liability, net of tax	(5.2)	1.0	4.6
Other, net of tax	(4.9)	0.6	(0.3)
Other comprehensive income (loss)	36.5	(35.1)	(25.3)
Comprehensive income	$ 402.0	$ 215.0	$ 294.4