Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 478.8	$ 497.7
Cost of sales	344.7	354.7
Gross margin	134.1	143.0
Selling, general and administrative expenses	42.9	47.4
Research and technology expenses	12.6	11.7
Operating income	78.6	83.9
Interest expense, net	6.2	5.6
Income before income taxes, and equity in earnings from affiliated companies	72.4	78.3
Provision for income taxes	8.6	22.7
Income before equity in earnings from affiliated companies	63.8	55.6
Equity in earnings from affiliated companies	0.8	0.4
Net income	$ 64.6	$ 56.0
Basic net income per common share:	$ 0.71	$ 0.60
Diluted net income per common share:	$ 0.70	$ 0.59
Weighted-average common shares:
Basic	91.4	93.4
Diluted	92.9	94.8