Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 1,324.7	$ 1,502.4	$ 2,355.7
Cost of sales	1,074.6	1,262.7	1,715.3
Gross margin	250.1	239.7	640.4
Selling, general and administrative expenses	135.0	121.1	158.7
Research and technology expenses	45.1	46.6	56.5
Other operating expense	18.2	57.9
Operating income	51.8	14.1	425.2
Interest expense, net	38.3	41.8	45.5
Other income	(8.5)
Income (loss) income before income taxes, and equity in earnings from affiliated companies	22.0	(27.7)	379.7
Income tax expense (benefit)	5.9	(61.0)	76.8
Income before equity in earnings	16.1	33.3	302.9
Equity in earnings (losses) from affiliated companies	0.0	(1.6)	3.7
Net income	$ 16.1	$ 31.7	$ 306.6
Basic net income per common share:	$ 0.19	$ 0.38	$ 3.61
Diluted net income per common share:	$ 0.19	$ 0.38	$ 3.57
Weighted-average common shares:
Basic	84.1	83.8	84.9
Diluted	84.6	84.0	85.8