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Income Tax Matters, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income tax provision | $ 9.8 | $ 5.9 |
Effective tax rate (percent) | 26.00% | 19.00% |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount |  | $ (1.8) |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent |  | (6.00%) |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses | $ 0.7 | $ (0.8) |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses (percent) | 2.00% | (3.00%) |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount | $ (0.5) |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent | (1.00%) |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | $ 0.4 | $ 0.6 |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent | 1.00% | 2.00% |
Gross unrecognized tax benefits | $ 1.5 |  | $ 1.5
Gross unrecognized tax benefits that would impact effective tax rate | $ 0.4 |  | $ 0.4

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