Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 522.6	$ 475.7	$ 1,020.3	$ 947.5
Cost of sales	372.3	336.6	727.0	666.6
Gross margin	150.3	139.1	293.3	280.9
Selling, general and administrative expenses	38.6	38.1	86.0	84.8
Research and technology expenses	11.6	10.4	23.3	22.9
Operating income	100.1	90.6	184.0	173.2
Interest expense, net	5.7	2.5	11.3	4.4
Non-operating expense	0.4		0.4
Income before income taxes, and equity in earnings from affiliated companies	94.0	88.1	172.3	168.8
Provision for income taxes	28.7	27.0	51.4	39.9
Income before equity in earnings from affiliated companies	65.3	61.1	120.9	128.9
Equity in earnings from affiliated companies	0.8	0.6	1.2	0.9
Net income	$ 66.1	$ 61.7	$ 122.1	$ 129.8
Basic net income per common share:	$ 0.71	$ 0.64	$ 1.31	$ 1.35
Diluted net income per common share:	$ 0.70	$ 0.63	$ 1.29	$ 1.32
Weighted-average common shares:
Basic	93.1	96.6	93.3	96.4
Diluted	94.6	98.2	94.7	98.0