Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 883.4	$ 1,012.3	$ 960.9
Cost of goods sold	(551.1)	(666.3)	(658.9)
Gross profit	332.3	346.0	302.0
Operating expenses:
Selling, general and administrative	(209.5)	(206.7)	(169.2)
Research and development	(25.4)	(25.3)	(22.2)
Adjustment to fair value of contingent consideration	9.4	40.7	1.9
(Loss)/profit on disposal of subsidiary	(1.4)	1.6	0.0
Total operating expenses	(226.9)	(189.7)	(189.5)
Operating income	105.4	156.3	112.5
Other net income	0.9	0.0	1.8
Interest expense, net	(3.2)	(4.0)	(3.4)
Income before income taxes	103.1	152.3	110.9
Income taxes	(21.8)	(32.8)	(26.8)
Net income	$ 81.3	$ 119.5	$ 84.1
Earnings per share:
Basic	$ 3.39	$ 4.96	$ 3.45
Diluted	$ 3.33	$ 4.86	$ 3.38
Weighted average shares outstanding (in thousands):
Basic	23,998	24,107	24,391
Diluted	24,442	24,612	24,878
Dividend declared per common share	$ 0.67	$ 0.61	$ 0.55