CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 491.5	$ 443.5
Cost of goods and services sold	324.5	296.7
Gross profit	167.0	146.8
Research and development	10.7	9.8
Selling, general and administrative expenses	71.8	68.6
Other income (Note 15)	(3.5)	(2.3)
Operating profit	88.0	70.7
Interest expense	2.0	2.3
Interest income	(0.8)	(0.9)
Other nonoperating expense (income)	0.3	(0.6)
Income before income taxes	86.5	69.9
Income tax expense	15.0	16.1
Equity in net income of affiliated companies	(2.8)	(1.6)
Net income	$ 74.3	$ 55.4
Net income per share:
Basic (in dollars per share)	$ 1.01	$ 0.75
Diluted (in dollars per share)	$ 0.99	$ 0.73
Weighted average shares outstanding:
Basic (in shares)	73.9	74.1
Diluted (in shares)	75.5	75.3