Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 500.5	$ 448.8	$ 1,520.8	$ 1,396.3
Cost of sales	364.8	324.7	1,091.8	991.3
Gross margin	135.7	124.1	429.0	405.0
Selling, general and administrative expenses	35.1	35.5	121.1	120.3
Research and technology expenses	11.5	10.6	34.8	33.5
Operating income	89.1	78.0	273.1	251.2
Interest expense, net	5.5	4.6	16.8	9.0
Non-operating expense			0.4
Income before income taxes, and equity in earnings from affiliated companies	83.6	73.4	255.9	242.2
Provision for income taxes	16.1	20.7	67.5	60.6
Income before equity in earnings from affiliated companies	67.5	52.7	188.4	181.6
Equity in earnings from affiliated companies	0.7	0.8	1.9	1.7
Net income	$ 68.2	$ 53.5	$ 190.3	$ 183.3
Basic net income per common share:	$ 0.74	$ 0.56	$ 2.04	$ 1.91
Diluted net income per common share:	$ 0.72	$ 0.55	$ 2.01	$ 1.88
Weighted-average common shares:
Basic	92.7	95.8	93.1	96.2
Diluted	94.1	97.3	94.6	97.7