Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 2,178.0		$ 2,227.8		$ 2,032.5
Cost of sales	1,803.0	[1]	1,802.6	[1]	1,668.0
Gross profit	375.0		425.2		364.5
Operating costs and expenses:
Engineering, selling and administrative expenses	315.7		328.3		281.0
Asset impairment expense	0.0		0.0		171.9
Amortization of intangible assets	2.9		3.2		3.1
Restructuring expense	4.6		1.3		1.5
Total operating costs and expenses	323.2		332.8		457.5
Operating income (loss)	51.8		92.4		(93.0)
Other income (expense):
Interest expense	(38.3)		(33.9)		(31.6)
Amortization of deferred financing fees	(1.4)		(1.3)		(1.4)
Other income (expense) — net	(0.4)		(13.0)		5.8
Total other expense - net	(40.1)		(48.2)		(27.2)
Income (loss) before income taxes	11.7		44.2		(120.2)
Provision (benefit) for income taxes	(44.1)		5.0		3.4
Net income (loss)	$ 55.8		$ 39.2		$ (123.6)
Per Share Data
Basic income (loss) per common share	$ 1.58		$ 1.12		$ (3.51)
Diluted income (loss) per share	$ 1.56		$ 1.09		$ (3.51)

[1] The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.