Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Consolidated Statements of Operations
Net sales	$ 461.7	$ 416.5
Cost of sales	332.5	304.5
Gross margin	129.2	112.0
Selling, general and administrative expenses	41.0	38.0
Research and technology expenses	13.6	11.0
Operating income	74.6	63.0
Interest expense, net	1.8	1.7
Income before income taxes and equity in earnings of affiliated companies	72.8	61.3
Provision for income taxes	22.8	17.9
Income before equity in earnings of affiliated companies	50.0	43.4
Equity in earnings of affiliated companies	0.1	0.2
Net income	$ 50.1	$ 43.6
Basic net income per common share: (in dollars per share)	$ 0.51	$ 0.43
Diluted net income per common share: (in dollars per share)	$ 0.50	$ 0.43
Weighted average common shares outstanding:
Basic (in shares)	98.5	100.4
Diluted (in shares)	100.6	102.1