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Income Tax Matters - Reconciliation of Income Tax (Provision) Benefit based on Effective Income Tax Rate and Statutory Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation between income tax provision and statutory income tax provision: |  |  |
Amount of federal income tax (provision) benefit based on the statutory rate | $ (11.8) | $ 8.0 | $ 5.0
Decrease in federal valuation allowances | 0.0 | 1.1 | 0.2
Non-deductible compensation expense | (1.6) | (0.9) | (0.5)
Non-deductible benefit (expense) | 0.2 | (1.0) | (0.2)
State income tax benefit (provision), net of federal benefit | 1.5 | (0.5) | 1.0
Research and development credit | 3.2 | 2.2 | 0.6
Foreign income tax expense | (0.3) | (0.3) | (0.3)
Foreign undistributed earnings | (0.3) | (0.3) | (0.3)
Income tax (provision) benefit | $ (9.1) | $ 8.3 | $ 5.5

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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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