Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 1,834.1	$ 1,846.8	$ 1,581.3
Cost of sales	1,490.0	1,518.7	1,299.4
Gross profit	344.1	328.1	281.9
Operating costs and expenses:
Engineering, selling and administrative expenses	225.6	251.6	245.3
Asset impairment expense	0.0	82.6	0.1
Amortization of intangible assets	0.3	0.3	0.8
Restructuring expense	9.8	12.9	27.2
Other operating expenses	0.0	0.0	0.1
Total operating costs and expenses	235.7	347.4	273.5
Operating income (loss)	108.4	(19.3)	8.4
Other income (expense):
Interest expense	(32.7)	(39.1)	(39.2)
Amortization of deferred financing fees	(1.5)	(1.8)	(1.9)
Loss on debt extinguishment	(25.0)	0.0	0.0
Other income (expense) — net	9.8	(11.5)	(6.8)
Total other expense	(49.4)	(52.4)	(47.9)
Income (loss) from continuing operations before income taxes	59.0	(71.7)	(39.5)
Provision (benefit) for income taxes	12.4	(4.8)	(49.5)
Net income (loss) from continuing operations	46.6	(66.9)	10.0
Discontinued operations:
Loss from discontinued operations, net of income taxes of $0.0, $0.0 and $0.0, respectively	0.0	(0.2)	(0.6)
Net income (loss)	$ 46.6	$ (67.1)	$ 9.4
Basic net income (loss) per common share:
Net income (loss) from continuing operations	$ 1.31	$ (1.88)	$ 0.28
Loss from discontinued operations	0	(0.01)	(0.02)
Basic net income (loss) per share	1.31	(1.89)	0.26
Diluted net income (loss) per common share:
Net income (loss) from continuing operations	1.31	(1.88)	0.28
Loss from discontinued operations	0	(0.01)	(0.02)
Diluted net income (loss) per share	$ 1.31	$ (1.89)	$ 0.26