Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net sales	$ 475.7	$ 470.1	$ 947.5	$ 931.8
Cost of sales	336.6	341.0	666.6	673.5
Gross margin	139.1	129.1	280.9	258.3
Selling, general and administrative expenses	38.1	37.1	84.8	78.1
Research and technology expenses	10.4	10.9	22.9	24.5
Other operating expense		6.0		6.0
Operating income	90.6	75.1	173.2	149.7
Interest expense, net	2.5	2.0	4.4	3.8
Income before income taxes, and equity in earnings of affiliated companies	88.1	73.1	168.8	145.9
Provision for income taxes	27.0	22.9	39.9	45.7
Income before equity in earnings of affiliated companies	61.1	50.2	128.9	100.2
Equity in earnings from affiliated companies	0.6	0.4	0.9	0.5
Net income	$ 61.7	$ 50.6	$ 129.8	$ 100.7
Basic net income per common share:	$ 0.64	$ 0.52	$ 1.35	$ 1.03
Diluted net income per common share:	$ 0.63	$ 0.51	$ 1.32	$ 1.01
Weighted-average common shares:
Basic	96.6	97.3	96.4	97.9
Diluted	98.2	99.2	98.0	99.9