CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 670.7	$ 491.5
Cost of goods and services sold	398.8	324.5
Gross profit	271.9	167.0
Research and development	12.2	10.7
Selling, general and administrative expenses	80.2	71.8
Other expense (income)	3.9	(3.5)
Operating profit	175.6	88.0
Interest expense	1.9	2.0
Interest income	(0.1)	(0.8)
Other nonoperating (income) expense	(1.1)	0.3
Income before income taxes	174.9	86.5
Income tax expense	28.7	15.0
Equity in net income of affiliated companies	(5.0)	(2.8)
Net income	$ 151.2	$ 74.3
Net income per share:
Basic (in dollars per share)	$ 2.04	$ 1.01
Diluted (in dollars per share)	$ 1.99	$ 0.99
Weighted average shares outstanding:
Basic (in shares)	73.9	73.9
Diluted (in shares)	75.8	75.5