Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 451.9	$ 412.3	$ 1,383.7	$ 1,251.4
Cost of sales	329.9	300.2	1,003.4	910.5
Gross margin	122.0	112.1	380.3	340.9
Selling, general and administrative expenses	32.9	32.9	111.0	105.7
Research and technology expenses	10.1	10.2	34.6	31.3
Other operating expense			6.0
Operating income	79.0	69.0	228.7	203.9
Interest expense, net	2.1	1.9	5.9	5.7
Non-operating expense	0.5		0.5	1.0
Income before income taxes and equity in earnings of affiliated companies	76.4	67.1	222.3	197.2
Provision for income taxes	21.2	18.7	66.9	57.2
Income before equity in earnings of affiliated companies	55.2	48.4	155.4	140.0
Equity in earnings of affiliated companies	0.6	0.3	1.1	0.8
Net income	$ 55.8	$ 48.7	$ 156.5	$ 140.8
Basic net income per common share:	$ 0.58	$ 0.49	$ 1.61	$ 1.41
Diluted net income per common share:	$ 0.57	$ 0.48	$ 1.58	$ 1.38
Weighted average common shares outstanding:
Basic	95.8	99.7	97.2	100.0
Diluted	97.7	101.7	99.2	102.1