Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 2,004.3	$ 1,861.2	$ 1,855.5
Cost of sales	1,439.7	1,328.4	1,346.7
Gross margin	564.6	532.8	508.8
Selling, general and administrative expenses	157.6	156.1	149.1
Research and technology expenses	46.9	44.3	47.9
Other operating expense			6.0
Operating income	360.1	332.4	305.8
Interest expense, net	22.1	14.2	8.0
Non-operating expense	0.4		0.5
Income before income taxes, and equity in earnings of affiliated companies	337.6	318.2	297.3
Provision for income taxes	90.3	83.0	89.3
Income before equity in earnings of affiliated companies	247.3	235.2	208.0
Equity in earnings from affiliated companies	2.5	2.0	1.4
Net income	$ 249.8	$ 237.2	$ 209.4
Basic net income per common share:	$ 2.69	$ 2.48	$ 2.16
Diluted net income per common share:	$ 2.65	$ 2.44	$ 2.12
Weighted-average common shares:
Basic	92.8	95.8	96.8
Diluted	94.2	97.2	98.7