CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 397.6	$ 388.0	$ 785.3	$ 750.1
Cost of goods and services sold	272.6	254.7	526.2	493.5
Gross profit	125.0	133.3	259.1	256.6
Research and development	10.0	8.8	20.3	18.2
Selling, general and administrative expenses	60.6	62.5	122.2	120.6
Other expense (Note 12)	11.7	0.8	12.6	26.6
Operating profit	42.7	61.2	104.0	91.2
Interest expense	2.3	2.0	4.4	4.5
Interest income	0.3	0.3	0.6	0.6
Income before income taxes	40.7	59.5	100.2	87.3
Income tax expense	2.9	17.0	5.1	23.9
Equity in net income of affiliated companies	1.0	2.2	4.6	3.5
Net income	$ 38.8	$ 44.7	$ 99.7	$ 66.9
Net income per share:
Basic (in dollars per share)	$ 0.53	$ 0.61	$ 1.35	$ 0.92
Diluted (in dollars per share)	$ 0.51	$ 0.60	$ 1.32	$ 0.90
Weighted average shares outstanding:
Basic (in shares)	73.9	73.3	73.6	72.9
Diluted (in shares)	75.8	74.8	75.7	74.5
Dividends declared per share	$ 0.13	$ 0.12	$ 0.26	$ 0.24