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Income Taxes (Details) $ in Millions, ₩ in Billions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 KRW (₩)
Income tax provision | $ 12.4 | $ 4.6 | $ 19.7 | $ 9.6 |  |
Effective income tax rate | 29.70% | 13.20% | 24.60% | 13.50% |  |
Income tax expense, adjustments for ASU 2016-09, adjustment pursuant to SAB-118, and changes in valuation allowance | $ 3.9 |  |  |  |  |
Income tax expense, uncertain tax positions |  | $ 2.7 |  |  |  |
Income tax benefit, adjustment pursuant to SAB-118, uncertain tax positions, adjustments for ASU 2016-09, and changes in valuation allowance |  |  | $ 8.8 |  |  |
Income tax expense due to change in estimate related to uncertain tax position and adjustment for ASU 2016-09 |  |  |  | $ 3.9 |  |
Tax Authority, South Korea (SRTO) |  |  |  |  |  |
Income tax assessment notice, amount |  |  |  |  | $ 10.6 | ₩ 11.3
Without income tax benefit adjustment and valuation allowance |  |  |  |  |  |
Effective income tax rate | 39.20% | 5.40% | 35.60% | 8.10% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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