Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ 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	$ 480.5	$ 452.0	$ 958.4	$ 880.8
Costs and expenses:
Cost of sales	(396.7)	(409.8)	(819.7)	(794.1)
Selling, general and administrative expenses	(32.6)	(26.5)	(60.1)	(56.9)
Other operating charges, net	3.0	0.4	11.5	0.1
Total operating costs and expenses	432.4	436.7	891.4	851.1
Income from operations	48.1	15.3	67.0	29.7
Interest Expense, Net	(12.0)	(10.9)	(24.9)	(19.4)
Other Nonoperating Income (Expense)	(2.0)	(1.5)	(3.8)	(2.8)
Gain (Loss) on Extinguishment of Debt	(1.0)	0.0	(1.0)	0.0
Nonoperating Income (Expense)	(14.9)	(12.4)	(29.6)	(22.2)
Income before income taxes	33.2	2.9	37.3	7.5
Income tax provision	(10.4)	(3.3)	(4.2)	(4.0)
Net income (loss)	$ 22.8	$ (0.4)	$ 33.1	$ 3.4
Net income (loss) per common share:
Basic (in dollars per share)	$ 1.37	$ (0.03)	$ 2.00	$ 0.21
Diluted (in dollars per share)	$ 1.36	$ (0.03)	$ 1.99	$ 0.21
Weighted Average Number of Shares Outstanding, Basic	16,594	16,539	16,575	16,528
Weighted Average Number of Shares Outstanding, Diluted	16,686	16,539	16,644	16,552