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Income Tax Matters - Reconciliation of Income Tax Provision based on Effective Income Tax Rate and Statutory Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation between income tax provision and statutory income tax provision: |  |  |
Amount of federal income tax provision based on the statutory rate | $ (8.1) | $ (16.9) | $ (25.2)
(Increase) decrease in federal valuation allowances | 0.0 | (0.1) | 1.7
Non-deductible compensation expense | (1.1) | (1.7) | (0.6)
Non-deductible benefit (expense) | 0.4 | 0.1 | (1.5)
State income tax provision, net of federal benefit | (1.5) | (4.5) | (2.5)
Research and development credit | 0.4 | 7.7 | 0.0
Gross increases for tax positions from current year | 0.0 | (0.3) | 0.0
Gross decreases (increases) for tax positions from prior years | 0.4 | (2.4) | 0.0
Foreign income tax expense | (0.4) | (0.1) | (0.5)
Foreign undistributed (earnings) loss | (0.1) | (0.2) | 0.4
Tax rate change | 0.0 | 0.0 | (0.1)
Income tax provision | $ 10.0 | $ 18.4 | $ 28.3

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