Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 448.8	$ 451.9	$ 1,396.3	$ 1,383.7
Cost of sales	324.7	329.9	991.3	1,003.4
Gross margin	124.1	122.0	405.0	380.3
Selling, general and administrative expenses	35.5	32.9	120.3	111.0
Research and technology expenses	10.6	10.1	33.5	34.6
Other operating expense				6.0
Operating income	78.0	79.0	251.2	228.7
Interest expense, net	4.6	2.1	9.0	5.9
Non-operating expense		0.5		0.5
Income before income taxes, and equity in earnings of affiliated companies	73.4	76.4	242.2	222.3
Provision for income taxes	20.7	21.2	60.6	66.9
Income before equity in earnings of affiliated companies	52.7	55.2	181.6	155.4
Equity in earnings from affiliated companies	0.8	0.6	1.7	1.1
Net income	$ 53.5	$ 55.8	$ 183.3	$ 156.5
Basic net income per common share:	$ 0.56	$ 0.58	$ 1.91	$ 1.61
Diluted net income per common share:	$ 0.55	$ 0.57	$ 1.88	$ 1.58
Weighted-average common shares:
Basic	95.8	95.8	96.2	97.2
Diluted	97.3	97.7	97.7	99.2