CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 469.7	$ 447.5	$ 913.2	$ 863.2
Cost of goods and services sold	311.8	305.3	608.5	586.6
Gross profit	157.9	142.2	304.7	276.6
Research and development	9.6	10.8	19.4	20.4
Selling, general and administrative expenses	70.3	70.0	138.9	138.3
Other (income) expense (Note 15)	(2.5)	1.1	(4.8)	4.2
Operating profit	80.5	60.3	151.2	113.7
Interest expense	2.0	2.2	4.3	4.1
Interest income	(0.6)	(0.3)	(1.5)	(0.9)
Other nonoperating income	(0.5)	(1.7)	(1.1)	(3.3)
Income before income taxes	79.6	60.1	149.5	113.8
Income tax expense	15.5	6.0	31.6	18.5
Equity in net income of affiliated companies	(2.0)	(2.0)	(3.6)	(4.4)
Net income	$ 66.1	$ 56.1	$ 121.5	$ 99.7
Net income per share:
Basic (in dollars per share)	$ 0.90	$ 0.76	$ 1.64	$ 1.35
Diluted (in dollars per share)	$ 0.88	$ 0.75	$ 1.61	$ 1.33
Weighted average shares outstanding:
Basic (in shares)	73.7	73.6	73.9	73.8
Diluted (in shares)	75.1	75.0	75.3	75.2