CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 415.7	$ 387.7
Cost of goods and services sold	281.3	253.5
Gross profit	134.4	134.2
Research and development	9.6	10.3
Selling, general and administrative expenses	68.3	62.5
Other expense (Note 13)	3.1	0.9
Operating profit	53.4	60.5
Interest expense	1.9	2.1
Interest income	(0.6)	(0.3)
Other nonoperating income	(1.6)	(0.8)
Income before income taxes	53.7	59.5
Income tax expense	12.5	2.2
Equity in net income of affiliated companies	(2.4)	(3.6)
Net income	$ 43.6	$ 60.9
Net income per share:
Basic (in dollars per share)	$ 0.59	$ 0.83
Diluted (in dollars per share)	$ 0.58	$ 0.81
Weighted average shares outstanding:
Basic (in shares)	73.9	73.3
Diluted (in shares)	75.5	74.9
Dividends declared per share	$ 0.14	$ 0.13