Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Flows from Operating Activities
Net loss	$ (38.3)	$ (21.5)	$ (27.1)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	66.7	65.3	69.6
Amortization of deferred financing costs	1.3	2.8	2.2
Loss on disposal of property, plant, and equipment	0.3	1.2	1.4
Loss on extinguishment of debt	0.0	4.8	0.0
Gain on sale of patents	0.0	(5.4)	0.0
Deferred income taxes	(7.7)	(6.9)	(5.9)
Amortization of initial value of interest rate swap	0.0	(1.2)	(2.4)
Foreign currency gain	(5.3)	(1.6)	(0.3)
Stock-based compensation expense	7.6	6.3	(10.2)
Provision for common stock warrants	5.1	0.0	0.0
Amortization of cloud-based software implementation costs	4.1	3.6	3.0
Unrealized (gain) loss on strategic investments	(5.8)	0.4	0.0
Changes in operating assets and liabilities:
Accounts receivable	(4.4)	(11.6)	6.9
Inventories	(7.5)	(4.8)	5.3
Income tax receivable	0.0	(1.0)	0.4
Prepaid expenses and other current assets	1.0	0.6	(2.3)
Accounts payable	8.5	9.1	(0.7)
Accrued liabilities and other	(6.9)	7.8	6.6
Change in other assets and liabilities	4.4	(6.5)	6.1
Net cash provided by operating activities	23.1	41.4	52.6
Cash Flows from Investing Activities
Purchases of converter equipment	(27.0)	(28.3)	(31.4)
Purchases of other property, plant, and equipment	(3.3)	(4.8)	(23.9)
Proceeds from sale of patents	0.0	5.4	0.0
Proceeds from sale of property, plant, and equipment	0.0	0.0	2.9
Cash paid for strategic investments	(2.5)	(4.8)	0.0
Net cash used in investing activities	(32.8)	(32.5)	(52.4)
Cash Flows from Financing Activities
Proceeds from debt facilities	0.0	410.0	0.0
Principal payments on term loans	(4.1)	(390.9)	(1.9)
Payment of exit costs related to debt facilities	0.0	(4.3)	0.0
Financing costs of debt facilities	0.0	(10.4)	(1.0)
Proceeds from hedging instruments	0.7	0.0	0.0
Proceeds from financing arrangements	1.1	0.7	3.2
Payments on financing arrangements	(1.2)	(1.5)	(0.5)
Payments on finance lease liabilities	(2.3)	(1.4)	(1.1)
Tax payments for withholdings on stock-based awards distributed	(1.2)	(0.4)	(0.5)
Net cash (used in) provided by financing activities	(7.0)	1.8	(1.8)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	3.6	3.4	0.8
Net (Decrease) Increase in Cash and Cash Equivalents	(13.1)	14.1	(0.8)
Cash and Cash Equivalents, beginning of period	76.1	62.0	62.8
Cash and Cash Equivalents, end of period	$ 63.0	$ 76.1	$ 62.0