Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales		$ 1,761.5	$ 1,724.2	$ 1,730.4
Costs and expenses:
Cost of sales		(1,597.0)	(1,536.7)	(1,521.2)
Selling, general and administrative expenses		(112.8)	(107.8)	(121.2)
Other Operating Income (Expense), Net		6.3	(17.5)	16.8
Goodwill, Impairment Loss		0.0	195.1	0.0
Total operating costs and expenses		1,716.1	1,822.1	1,659.2
Income (loss) from operations		45.4	(97.9)	71.2
Interest Income (Expense), Nonoperating, Net		(44.9)	(30.7)	(31.4)
Debt retirement costs		(2.7)	0.0	0.0
Net periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component		(5.7)	(4.9)	1.1
Earnings before income taxes		(7.9)	(133.5)	40.9
Income tax provision (benefit)		2.3	(10.3)	56.4
Net income (loss)		$ (5.6)	$ (143.8)	$ 97.3
Net earnings per common share:
Earnings per share, basic		$ (0.34)	$ (8.72)	$ 5.91
Earnings per share, diluted		$ (0.34)	$ (8.72)	$ 5.88
Weighted average number of shares outstanding, basic	[1]	16,533	16,487	16,464
Weighted average number of shares outstanding, diluted		16,533	16,487	16,556

[1] Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance. See Note 14 "Stockholders' Equity" for further discussion.