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Income Taxes (Details) $ in Millions, ₩ in Billions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 KRW (₩)
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax provision | $ 20.0 |  | $ 12.4 | $ 34.0 | $ 19.7 |  |
Effective income tax rate | 34.70% |  | 29.70% | 31.20% | 24.60% |  |
Adjustment for discrete tax expense, change in legislation in several states | $ 3.0 |  |  |  |  |  |
Adjustment for discrete tax expense, change in legislation and other discrete tax items | $ 0.8 |  |  |  |  |  |
Adjustment for income tax benefit, adjustment for stock-based compensation and change in valuation allowance |  |  | $ 3.9 |  |  |  |
Adjustment for income tax benefit, amounts that should have been recognized in a prior period |  |  |  | $ 3.2 |  |  |
Adjustment for income tax benefit, amounts that should have been recognized in a prior period and other discrete tax items |  |  |  | $ 2.0 |  |  |
Adjustment for income tax benefit, adjustment pursuant to SAB-118, uncertain tax positions, adjustments for ASU 2016-09, and changes in valuation allowance |  |  |  |  | $ 8.8 |  |
Tax Authority, South Korea (SRTO) |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax assessment notice, amount |  |  |  |  |  | $ 9.8 | ₩ 11.3
Pro forma |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective income tax rate | 33.30% |  | 39.20% | 33.10% | 35.60% |  |
Adjustment for income tax benefit, amounts that should have been recognized in a prior period |  | $ (3.2) |  |  |  |  |

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