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Commitments and Contingencies (Details) - Foreign Tax Authority R$ in Millions, $ in Millions, ₩ in Billions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2018 KRW (₩) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 KRW (₩) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 KRW (₩) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 BRL (R$)
Tax Authority, South Korea (SRTO) | Assessment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Pre-assessment notice, amount | $ 10.0 | ₩ 11.3 |  |  | $ 10.4 | ₩ 11.7 |  |
Tax Authority, South Korea (SRTO) | Additional Assessment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Pre-assessment notice, amount |  |  | $ 17.8 | ₩ 20.1 |  |  |  |
Federal, State and Municipal Tax Authorities in Brazil | Assessment |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  | $ 11.6 | R$ 57.3

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