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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax expense | $ 4.9 | $ 3.9 | $ 2.9 | $ 5.5 |  |
Effective income tax rate (percent) | 25.10% | 26.70% | 15.70% | 26.30% |  |
Liability for gross unrecognized tax benefits | $ 2.1 |  | $ 2.1 |  |  | $ 2.3
Unrecognized tax benefit that would impact effective tax rate | $ 1.6 |  | $ 1.6 |  |  | $ 0.1
Forecast |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate (percent) |  |  |  |  | 21.00% |

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