Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales		$ 378.7	$ 609.0	$ 919.7	$ 1,218.9
Cost of sales		323.8	440.2	723.9	882.9
Gross margin		54.9	168.8	195.8	336.0
Selling, general and administrative expenses		24.1	39.5	70.6	89.0
Research and technology expenses		11.3	14.2	25.3	29.1
Other operating expense		13.1		27.8
Operating income		6.4	115.1	72.1	217.9
Interest expense, net		10.7	11.9	22.7	23.9
Income (loss) before income taxes, and equity in earnings from affiliated companies		(4.3)	103.2	49.4	194.0
Provision for (benefit from) income taxes		(3.6)	23.6	8.2	44.2
Income (loss) before equity in earnings from affiliated companies		(0.7)	79.6	41.2	149.8
Equity in earnings (loss) from affiliated companies		(0.3)	1.3	0.2	3.3
Net income (loss)		$ (1.0)	$ 80.9	$ 41.4	$ 153.1
Basic net income (loss) per common share		$ (0.01)	$ 0.95	$ 0.49	$ 1.80
Diluted net income (loss) per common share	[1]	$ (0.01)	0.94	0.49	1.78
Dividends per share			$ 0.15	$ 0.17	$ 0.30
Weighted-average common shares:
Basic		83.7	85.2	83.7	85.1
Diluted	[1]	83.7	86.2	84.1	86.1

[1] For the quarter ended June 30, 2020, the dilutive impact of outstanding options and restricted stock units was excluded from the dilutive share count as a result of the Company’s net loss for the period.