Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements of Operations
Net sales	$ 416.5	$ 400.1
Cost of sales	304.5	293.7
Gross margin	112.0	106.4
Selling, general and administrative expenses	38.0	36.6
Research and technology expenses	11.0	9.2
Operating income	63.0	60.6
Interest expense, net	1.7	3.0
Income before income taxes and equity in earnings of affiliated companies	61.3	57.6
Provision for income taxes	17.9	18.4
Income before equity in earnings of affiliated companies	43.4	39.2
Equity in earnings of affiliated companies	0.2	0.4
Net income	$ 43.6	$ 39.6
Basic net income per common share: (in dollars per share)	$ 0.43	$ 0.40
Diluted net income per common share: (in dollars per share)	$ 0.43	$ 0.39
Weighted average common shares outstanding:
Basic (in shares)	100.4	99.8
Diluted (in shares)	102.1	101.7