Segment Information (Segment Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 1,717.4	$ 1,599.1	$ 1,509.1
Operating profit	240.3	225.8	195.2
Interest expense	8.4	7.8	8.1
Interest income	(2.1)	(1.3)	(1.1)
Other nonoperating income	(6.7)	(3.1)	(1.6)
Income before income taxes	240.7	222.4	189.8
Segment assets	1,978.9	1,862.8	1,716.7
Capital expenditures	(104.7)	(130.8)	(170.2)
Depreciation and amortization expense	104.4	96.7	90.7
Proprietary Products [Member]
Segment Reporting Information [Line Items]
Net sales	1,308.6	1,236.9	1,189.9
Operating profit	266.4	243.8	243.1
Interest expense	0.0	0.0	0.0
Interest income	0.0	0.0	0.0
Other nonoperating income	0.0	0.0	0.0
Income before income taxes	266.4	243.8	243.1
Segment assets	1,342.3	1,321.3	1,173.9
Capital expenditures	(77.0)	(107.2)	(133.2)
Depreciation and amortization expense	83.9	77.1	71.7
Contract-Manufactured Products [Member]
Segment Reporting Information [Line Items]
Net sales	409.1	362.5	320.2
Operating profit	44.3	48.3	38.2
Interest expense	0.0	0.0	0.0
Interest income	0.0	0.0	0.0
Other nonoperating income	0.0	0.0	0.0
Income before income taxes	44.3	48.3	38.2
Segment assets	301.4	286.4	261.1
Capital expenditures	(20.7)	(18.6)	(34.0)
Depreciation and amortization expense	17.2	16.4	14.9
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(0.3)	(0.3)	(1.0)
Operating profit	(70.4)	(66.3)	(86.1)
Interest expense	8.4	7.8	8.1
Interest income	(2.1)	(1.3)	(1.1)
Other nonoperating income	(6.7)	(3.1)	(1.6)
Income before income taxes	(70.0)	(69.7)	(91.5)
Segment assets	335.2	255.1	281.7
Capital expenditures	(7.0)	(5.0)	(3.0)
Depreciation and amortization expense	$ 3.3	$ 3.2	$ 4.1