Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities
Net loss	$ (21.5)	$ (27.1)	$ (41.4)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	65.3	69.6	69.0
Amortization of deferred financing costs	2.8	2.2	1.5
Loss on disposal of property, plant, and equipment	1.2	1.4	1.1
Loss on extinguishment of debt	4.8	0.0	0.0
Gain on sale of patents	(5.4)	0.0	0.0
Deferred income taxes	(6.9)	(5.9)	(19.7)
Amortization of initial value of interest rate swap	(1.2)	(2.4)	(0.8)
Foreign currency gain	(1.6)	(0.3)	(2.2)
Stock-based compensation expense	6.3	(10.2)	18.3
Amortization of cloud-based software implementation costs	3.6	3.0	2.8
Unrealized (gain) loss on strategic investments	0.4	0.0	(3.9)
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(11.6)	6.9	9.1
(Increase) decrease in inventories	(4.8)	5.3	7.6
(Increase) decrease in income tax receivable	(1.0)	0.4	0.6
(Increase) decrease in prepaid expenses and other current assets	0.6	(2.3)	(1.6)
Increase (decrease) in accounts payable	9.1	(0.7)	(12.4)
Increase (decrease) in accrued liabilities and other	7.8	6.6	(14.4)
Change in other assets and liabilities	(6.5)	6.1	(12.5)
Net cash provided by operating activities	41.4	52.6	1.1
Cash Flows from Investing Activities
Purchases of converter equipment	(28.3)	(31.4)	(31.6)
Purchases of other property, plant, and equipment	(4.8)	(23.9)	(13.2)
Proceeds from sale of patents	5.4	0.0	0.0
Proceeds from sale of property, plant, and equipment	0.0	2.9	0.0
Cash paid for strategic investments	(4.8)	0.0	(2.1)
Cash inflow from settlement of net investment hedges	0.0	0.0	10.0
Patent and trademark expenditures	0.0	0.0	(1.0)
Net cash used in investing activities	(32.5)	(52.4)	(37.9)
Cash Flows from Financing Activities
Proceeds from debt facilities	410.0	0.0	0.0
Principal payments on term loans	(390.9)	(1.9)	(1.1)
Payment of exit costs related to debt facilities	(4.3)	0.0	0.0
Financing costs of debt facilities	(10.4)	(1.0)	0.0
Proceeds from equipment financing	0.7	3.2	0.0
Payments on equipment financing	(1.5)	(0.5)	0.0
Payments on finance lease liabilities	(1.4)	(1.1)	(0.9)
Tax payments for withholdings on stock-based awards distributed	(0.4)	(0.5)	(2.5)
Net cash provided by (used in) financing activities	1.8	(1.8)	(4.5)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	3.4	0.8	0.2
Net Increase (Decrease) in Cash and Cash Equivalents	14.1	(0.8)	(41.1)
Cash and Cash Equivalents, beginning of period	62.0	62.8	103.9
Cash and Cash Equivalents, end of period	$ 76.1	$ 62.0	$ 62.8