CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net sales	$ 202.8	$ 214.2	$ 393.3	$ 427.6
Cost of sales	138.8	141.1	272.3	286.3
Gross margin	64.0	73.1	121.0	141.3
Selling, general and administrative expenses	48.5	50.9	93.0	98.4
Research and development expenses	7.0	9.5	14.1	18.4
Restructuring and impairment charges	76.1	1.4	82.0	1.5
Other operating (income) expense, net	(0.1)	0.0	(0.3)	0.0
Operating income (loss)	(67.5)	11.3	(67.8)	23.0
Equity income in unconsolidated joint ventures	0.0	0.5	0.0	0.8
Other income (expense), net	(2.2)	0.3	(3.8)	0.7
Interest income (expense), net	0.4	(0.2)	0.7	(1.0)
Income (loss) before income taxes	(69.3)	11.9	(70.9)	23.5
Income tax (benefit) expense	4.3	3.8	4.1	7.6
Net income (loss)	$ (73.6)	$ 8.1	$ (75.0)	$ 15.9
Basic earnings (loss) per share (in dollars per share)	$ (4.00)	$ 0.44	$ (4.08)	$ 0.85
Diluted earnings (loss) per share (in dollars per share)	$ (4.00)	$ 0.44	$ (4.08)	$ 0.85
Shares used in computing:
Basic earnings (loss) per share (in shares)	18.4	18.6	18.4	18.6
Diluted earnings (loss) per share (in shares)	18.4	18.6	18.4	18.6