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Income Tax Matters, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Income tax provision | $ 9.6 | $ 9.8 |
Effective tax rate (percent) | 25.00% | 26.00% |
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount |  | $ (0.5) |
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent |  | 1.00% |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses |  | $ 0.7 |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses (percent) |  | 2.00% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount |  | $ 0.4 |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent |  | 1.00% |
Gross unrecognized tax benefits | $ 3.9 |  | $ 4.1
Gross unrecognized tax benefits that would impact effective tax rate | $ 0.4 |  | $ 0.9

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