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Income Tax Matters - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Income tax benefit (provision) | $ 0.3 | $ (9.6) |
Effective tax rate (percent) | (6.00%) | 25.00% |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses | $ (0.4) |  |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses (percent) | (10.00%) |  |
Effective tax rate reconciliation, change in state tax rate, amount | $ (0.6) |  |
Effective income tax rate reconciliation, change in state tax rate, percent | (15.00%) |  |
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, amount | $ (0.2) |  |
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, percent | (6.00%) |  |
Gross unrecognized tax benefits | $ 4.0 |  | $ 3.8
Gross unrecognized tax benefits that would impact effective tax rate | $ 1.5 |  | $ 1.5

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