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Income Tax Matters, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax provision | $ 8.2 | $ 16.1 | $ 21.9 | $ 36.8 |
Effective tax rate (percent) | 27.30% | 44.70% | 24.30% | 37.80% |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount |  |  | $ (2.0) | $ (1.7) |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent |  |  | (2.30%) | (1.70%) |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses | $ (0.4) |  | $ (0.9) | $ (0.5) |
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses (percent) | (1.30%) |  | (1.00%) | (0.60%) |
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount |  | $ 2.5 |  | $ 2.5 |
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent |  | 7.10% |  | 2.60% |
Effective Income Tax Rate Reconciliation, Unrecognized Tax Benefit Amount |  |  |  | $ (0.2) |
Effective Income Tax Rate Reconciliation Unrecognized Tax Benefit Percent |  |  |  | (0.20%) |
Effective Income Tax Rate Reconciliation Sequestration of AMT Credits Amount | $ 0.2 |  | $ 0.6 |  |
Effective Income Tax Rate Reconciliation Sequestration of AMT Credits Percent | 0.70% |  | 0.60% |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | $ 0.6 |  | $ 1.7 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent | 1.90% |  | 1.90% |  |
Effective Income Tax Rate Reconciliation Advance Pricing Agreement, Amount | $ 0.3 |  | $ 0.3 |  |
Effective Income Tax Rate Reconciliation Advance Pricing Agreement, Percent | 1.00% |  | 0.30% |  |
Gross unrecognized tax benefits | $ 1.5 |  | $ 1.5 |  | $ 1.5
Gross unrecognized tax benefits that would impact effective tax rate | $ 0.4 |  | $ 0.4 |  | $ 0.4

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