Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 572.5	$ 540.5	$ 1,791.4	$ 1,628.1
Cost of sales	414.6	397.5	1,297.5	1,197.7
Gross margin	157.9	143.0	493.9	430.4
Selling, general and administrative expenses	33.8	32.6	122.8	114.3
Research and technology expenses	14.2	13.9	43.3	40.7
Operating income	109.9	96.5	327.8	275.4
Interest expense, net	11.0	10.6	34.9	27.3
Income before income taxes, and equity in earnings/(loss) from affiliated companies	98.9	85.9	292.9	248.1
Provision for income taxes	18.2	7.8	62.4	41.9
Income before equity in earnings/(loss) from affiliated companies	80.7	78.1	230.5	206.2
Equity in earnings/(loss) from affiliated companies	(0.4)	2.0	2.9	4.3
Net income	$ 80.3	$ 80.1	$ 233.4	$ 210.5
Basic net income per common share	$ 0.94	$ 0.92	$ 2.74	$ 2.37
Diluted net income per common share	0.93	0.91	2.71	2.35
Dividends per share	$ 0.17	$ 0.15	$ 0.47	$ 0.40
Weighted-average common shares:
Basic	85.1	87.0	85.1	88.6
Diluted	86.1	88.1	86.1	89.7