Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 328.8	$ 254.6	$ 595.9	$ 479.6
Operating expenses:
Cost of sales	233.0	180.4	423.3	340.9
Selling, general and administrative expense	58.0	46.6	111.9	94.0
Research and development expense	5.9	4.3	11.4	8.0
Restructuring expense	1.9	0.0	9.1	0.0
Other expense (income), net	0.1	0.1	0.6	(0.2)
Operating income	29.9	23.2	39.6	36.9
Interest income	0.3	0.2	0.7	0.5
Interest expense	(2.5)	(2.2)	(4.9)	(4.3)
Income from continuing operations before income taxes	27.7	21.2	35.4	33.1
Provision for income taxes	8.9	6.8	11.4	10.7
Income from continuing operations	18.8	14.4	24.0	22.4
Loss from discontinued operations, net	0.0	0.0	(0.1)	0.0
Net income	$ 18.8	$ 14.4	$ 23.9	$ 22.4
Basic earnings per share:
Income from continuing operations (in dollars per share)	$ 0.64	$ 0.49	$ 0.81	$ 0.76
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Net income (in dollars per share)	0.64	0.49	0.81	0.76
Diluted earnings per share:
Income from continuing operations (in dollars per share)	0.63	0.48	0.80	0.75
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Net income (in dollars per share)	0.63	0.48	0.80	0.75
Cash dividends declared per share (in dollars per share)	$ 0.1	$ 0.09	$ 0.2	$ 0.18