Segment Information (Segment Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 1,839.9	$ 1,717.4	$ 1,599.1
Operating profit	296.6	240.3	225.8
Interest expense	8.5	8.4	7.8
Interest income	(3.8)	(2.1)	(1.3)
Other nonoperating expense (income)	0.1	(6.7)	(3.1)
Income before income taxes	291.8	240.7	222.4
Segment assets	2,341.4	1,978.9	1,862.8
Capital expenditures	(126.4)	(104.7)	(130.8)
Depreciation and amortization expense	103.4	104.4	96.7
Proprietary Products [Member]
Segment Reporting Information [Line Items]
Net sales	1,398.6	1,308.6	1,236.9
Operating profit	313.6	266.4	243.8
Interest expense	0.0	0.0	0.0
Interest income	0.0	0.0	0.0
Other nonoperating expense (income)	0.0	0.0	0.0
Income before income taxes	313.6	266.4	243.8
Segment assets	1,480.6	1,342.3	1,321.3
Capital expenditures	(91.2)	(77.0)	(107.2)
Depreciation and amortization expense	82.2	83.9	77.1
Contract-Manufactured Products [Member]
Segment Reporting Information [Line Items]
Net sales	441.5	409.1	362.5
Operating profit	49.1	44.3	48.3
Interest expense	0.0	0.0	0.0
Interest income	0.0	0.0	0.0
Other nonoperating expense (income)	0.0	0.0	0.0
Income before income taxes	49.1	44.3	48.3
Segment assets	386.0	301.4	286.4
Capital expenditures	(37.2)	(20.7)	(18.6)
Depreciation and amortization expense	17.9	17.2	16.4
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(0.2)	(0.3)	(0.3)
Operating profit	(66.1)	(70.4)	(66.3)
Interest expense	8.5	8.4	7.8
Interest income	(3.8)	(2.1)	(1.3)
Other nonoperating expense (income)	0.1	(6.7)	(3.1)
Income before income taxes	(70.9)	(70.0)	(69.7)
Segment assets	474.8	335.2	255.1
Capital expenditures	2.0	(7.0)	(5.0)
Depreciation and amortization expense	$ 3.3	$ 3.3	$ 3.2