Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 541.0	$ 609.9
Cost of sales	400.1	442.7
Gross margin	140.9	167.2
Selling, general and administrative expenses	46.5	49.5
Research and technology expenses	14.0	14.9
Other operating expense	14.7
Operating income	65.7	102.8
Interest expense, net	12.0	12.0
Income before income taxes, and equity in earnings from affiliated companies	53.7	90.8
Provision for income taxes	11.8	20.6
Income before equity in earnings from affiliated companies	41.9	70.2
Equity in earnings from affiliated companies	0.5	2.0
Net income	$ 42.4	$ 72.2
Basic net income per common share	$ 0.51	$ 0.85
Diluted net income per common share	0.50	0.84
Dividends per share	$ 0.17	$ 0.15
Weighted-average common shares:
Basic	83.7	85.0
Diluted	84.3	86.0