Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net Sales	$ 457.4	$ 445.2	$ 1,415.8	$ 1,326.0
Costs and expenses:
Cost of sales	(378.6)	(418.7)	(1,198.3)	(1,212.8)
Selling, general and administrative expenses	(29.3)	(27.0)	(89.4)	(83.9)
Other operating charges, net	0.3	1.9	11.9	2.1
Total operating costs and expenses	408.2	447.6	1,299.6	1,298.7
Income from operations	49.2	(2.4)	116.2	27.2
Interest Expense, Net	(12.2)	(13.1)	(37.0)	(32.5)
Other Nonoperating Income (Expense)	(1.9)	(1.4)	(5.7)	(4.3)
Gain (Loss) on Extinguishment of Debt	(3.9)	(2.7)	(4.8)	(2.7)
Nonoperating Income (Expense)	(17.9)	(17.2)	(47.5)	(39.5)
Income (loss) before income taxes	31.3	(19.7)	68.7	(12.2)
Income tax provision (benefit)	(9.9)	8.7	(14.1)	4.7
Net income (loss)	$ 21.4	$ (11.0)	$ 54.5	$ (7.6)
Net income (loss) per common share:
Basic (in dollars per share)	$ 1.29	$ (0.66)	$ 3.29	$ (0.46)
Diluted (in dollars per share)	$ 1.28	$ (0.66)	$ 3.27	$ (0.46)
Weighted Average Number of Shares Outstanding, Basic	16,595	16,539	16,581	16,531
Weighted Average Number of Shares Outstanding, Diluted	16,783	16,539	16,689	16,531