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Commitments and Contingencies (Details) R$ in Millions, $ in Millions, ₩ in Billions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 BRL (R$) | Jun. 30, 2017 KRW (₩) | Dec. 31, 2016 KRW (₩)
Tax Authority, South Korea (SRTO) | Assessment |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Income tax assessment notice, amount | $ |  | $ 9.4 |  |  |  |
Estimate of possible loss | ₩ |  |  |  |  |  | ₩ 11.3
Tax Authority, South Korea (SRTO) | Additional Assessment |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Income tax assessment notice, amount | $ | $ 16.8 |  |  |  |  |
Estimate of possible loss | ₩ |  |  |  |  | ₩ 20.1 |
Federal, State and Municipal Tax Authorities in Brazil | Assessment |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible loss |  |  | $ 9.0 | R$ 49.1 |  |

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