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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Operating Loss Carryforwards |  |  |  |  |  |
Tax benefit from changes in enacted taxes |  | $ 22.5 |  |  |  |
Provisional decrease of deferred tax liabilities |  | 26.9 |  |  |  |
Provisional deemed repatriation transition tax |  | 8.7 |  |  |  | $ 8.7
One-time provisional tax benefit |  |  |  |  |  | 26.9
Deferred foreign income tax adjustment | $ (0.6) |  |  | $ (0.6) |  |
Income tax expense | $ 4.2 |  | $ 0.7 | $ 9.7 | $ 0.6 |
Effective income tax rate (percent) | 16.00% |  | 100.00% | 20.60% | 120.00% |
Effective federal statutory rate (percent) | 21.00% |  | 35.00% | 21.00% |  |
Liability for gross unrecognized tax benefits | $ 1.7 | 0.8 |  | $ 1.7 |  | 0.8
Unrecognized tax benefit that would impact effective tax rate | 0.8 | 0.6 |  | 0.8 |  | 0.6
Accrual for interest and penalties | 0.2 | 0.1 |  | $ 0.2 |  | 0.1
Hudson |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |
Provisional deemed repatriation transition tax | (1.4) | 8.7 |  |  |  | $ 8.7
Additional taxes related to proposed merger | $ 1.5 | $ 4.5 |  |  |  |

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