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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Operating Loss Carryforwards |  |  |
Tax benefit from changes in enacted taxes |  |  | $ 22.5
One-time provisional tax benefit |  |  | 26.9
Provisional deemed repatriation transition tax |  |  | 8.7
Provisional decrease of deferred tax liabilities |  |  | 26.9
Income tax expense (benefit) | $ 2.3 | $ (1.8) |
Effective income tax rate (percent) | 26.70% | 37.40% |
Effective federal statutory rate (percent) | 21.00% | 35.00% |
Liability for gross unrecognized tax benefits | $ 1.1 |  | 0.8
Unrecognized tax benefit that would impact effective tax rate | 1.0 |  | 0.6
Accrual for interest and penalties | $ 0.2 |  | 0.1
Hudson |  |  |
Operating Loss Carryforwards |  |  |
Provisional deemed repatriation transition tax |  |  | (4.5)
One-time provisional tax benefit |  |  | $ 8.7

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