Consolidated Statements of Income - USD ($) shares in Thousands, $ 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	$ 242.9	$ 221.3	$ 512.1	$ 442.0
Cost of goods sold	(155.4)	(152.7)	(342.8)	(307.7)
Gross profit	87.5	68.6	169.3	134.3
Operating expenses:
Selling, general and administrative	(50.2)	(37.7)	(98.9)	(79.7)
Research and development	(6.5)	(5.6)	(12.7)	(11.3)
Adjustment to fair value of contingent consideration	26.6	0.0	23.1	0.0
Total operating expenses	(30.1)	(43.3)	(88.5)	(91.0)
Operating income	57.4	25.3	80.8	43.3
Other net income/(expense)	(4.7)	(0.7)	(3.2)	1.2
Interest expense, net	(0.9)	(0.8)	(1.9)	(1.7)
Income before income taxes	51.8	23.8	75.7	42.8
Income taxes	(17.3)	(5.3)	(23.3)	(7.4)
Net income	$ 34.5	$ 18.5	$ 52.4	$ 35.4
Earnings per share:
Basic	$ 1.43	$ 0.76	$ 2.16	$ 1.45
Diluted	$ 1.40	$ 0.75	$ 2.12	$ 1.44
Weighted average shares outstanding (in thousands):
Basic	24,202	24,401	24,251	24,382
Diluted	24,671	24,672	24,761	24,632