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Income Tax Matters - Reconciliation of Income Tax Benefit (Provision) based on Effective Income Tax Rate and Statutory Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation between income tax provision and statutory income tax provision:
Amount of federal income tax benefit (provision) based on the statutory rate	$ 8.0	$ 5.0	$ (8.1)
Decrease in federal valuation allowances	1.1	0.2	0.0
Non-deductible compensation expense	(0.9)	(0.5)	(1.1)
Non-deductible (expense) benefit	(1.0)	(0.2)	0.4
State income tax (provision) benefit, net of federal benefit	(0.5)	1.0	(1.5)
Research and development credit	2.2	0.6	0.4
Gross decreases for tax positions from prior years	0.0	0.0	0.4
Foreign income tax expense	(0.3)	(0.3)	(0.4)
Foreign undistributed earnings	(0.3)	(0.3)	(0.1)
Income tax benefit (provision)	$ 8.3	$ 5.5	$ (10.0)

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Effective income tax rate reconciliation change in tax contingency prior year tax positions amount.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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