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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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
One-time provisional tax benefit |  |  |  |  | 26.9
Income tax expense | $ 5.0 | $ 2.2 | $ 7.3 | $ 0.4 |
Effective income tax rate (percent) | 27.60% | 39.80% | 27.30% | 53.60% |
Effective federal statutory rate (percent) | 21.00% | 35.00% | 21.00% | 35.00% |
Liability for gross unrecognized tax benefits | $ 1.1 |  | $ 1.1 |  | 0.8
Unrecognized tax benefit that would impact effective tax rate | 1.0 |  | 1.0 |  | 0.6
Accrual for interest and penalties | $ 0.2 |  | $ 0.2 |  | 0.1
Hudson |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Provisional deemed repatriation transition tax |  |  |  |  | 8.7
Additional taxes related to proposed merger |  |  |  |  | $ 4.5

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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