CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net Sales	$ 431.7	$ 398.2	$ 1,294.9	$ 1,183.5
Cost of goods and services sold	296.1	273.1	882.7	799.2
Gross profit	135.6	125.1	412.2	384.3
Research and development	10.1	9.1	30.5	29.4
Selling, general and administrative expenses	64.9	62.6	203.2	186.4
Other (income) expense (Note 13)	(0.2)	(9.5)	4.0	3.1
Operating profit	60.8	62.9	174.5	165.4
Interest expense	2.0	1.4	6.1	5.7
Interest income	(0.5)	(0.3)	(1.4)	(0.9)
Other nonoperating income	(1.8)	(1.1)	(5.1)	(2.5)
Income before income taxes	61.1	62.9	174.9	163.1
Income tax expense	8.0	14.0	26.5	19.1
Equity in net income of affiliated companies	(2.1)	(2.1)	(6.5)	(6.7)
Net income	$ 55.2	$ 51.0	$ 154.9	$ 150.7
Net income per share:
Basic (in dollars per share)	$ 0.75	$ 0.69	$ 2.10	$ 2.04
Diluted (in dollars per share)	$ 0.73	$ 0.67	$ 2.05	$ 1.99
Weighted average shares outstanding:
Basic (in shares)	73.9	74.2	73.9	73.8
Diluted (in shares)	75.7	75.9	75.4	75.8
Dividends declared per share	$ 0.15	$ 0.14	$ 0.43	$ 0.40