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Income Tax Matters, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax provision | $ 2.2 | $ 15.7 | $ 20.7 | $ 30.8 |
Effective tax rate (percent) | 31.70% | 37.70% | 33.80% | 37.10% |
Effective tax rate reconciliation, decrease due to recognition of excess tax benefits from stock-based compensation | $ (0.1) |  | $ (1.7) |  |
Effective tax rate reconciliation, decrease due to recognition of excess tax benefits from stock-based compensation (percent) | (1.50%) |  | (2.70%) |  |
Effective tax rate reconciliation, decrease to the valuation allowance for certain state net operating losses | $ (0.1) |  | $ (0.5) |  |
Effective tax rate reconciliation, decrease to the valuation allowance for certain state net operating losses (percent) | (1.40%) |  | (0.90%) |  |
Effective tax rate reconciliation, decrease related to unrecognized tax benefits , including interest and penalties | $ (0.2) |  | $ (0.2) |  |
Effective tax rate reconciliation, decrease related to unrecognized tax benefits , including interest and penalties (percent) | (3.00%) |  | (0.30%) |  |
Gross unrecognized tax benefits | $ 1.5 |  | $ 1.5 |  | $ 1.8
Gross unrecognized tax benefits that would impact effective tax rate | $ 0.4 |  | $ 0.4 |  | $ 0.7

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