Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 786	$ 767
Cost of products sold	647	608
Gross profit	139	159
Selling and administrative expenses	93	75
Operating profit	46	84
Income from equity method investments	9	13
Interest expense	(14)	(20)
Interest income	1	1
Other income, net	3	6
Income from continuing operations before income taxes	45	84
Income tax expense	(9)	(29)
Income from continuing operations	36	55
Income from discontinued operations, net of tax	1	0
Net income	$ 37	$ 55
Basic earnings per average common share (in usd per share)	$ 0.26	$ 0.38
Diluted earnings per average common share (in dollars per share)	$ 0.25	$ 0.37
Average common shares (in shares)	141,105,228	146,309,994
Dilutive awards under long-term incentive plan (in shares)	2,703,126	2,420,360
Average diluted common shares (in shares)	143,808,354	148,730,354