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Commitments and Contingencies - Legal, Tax, and Other Matters (Details) R$ in Millions, $ in Millions, ₩ in Billions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 KRW (₩) | Dec. 31, 2016 KRW (₩) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 BRL (R$)
South Korea (SRTO) | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Pre-assessment notice, amount |  |  | ₩ 11.7 |  |
South Korea (SRTO) | Tax authority additional assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Pre-assessment notice, amount | $ 18.5 | ₩ 20.1 |  |  |
Federal, state and municipal tax authorities in Brazil | Assessment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss |  |  |  | $ 11.0 | R$ 57.0

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