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Commitments and Contingencies - Legal, Tax, and Other Matters (Details) - Assessment R$ in Millions, $ in Millions, ₩ in Billions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 KRW (₩) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 KRW (₩) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 BRL (R$)
South Korea (SRTO) |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Pre-assessment notice, amount | $ 17.4 | ₩ 20.1 | $ 9.8 | ₩ 11.3 |  |
Federal, state and municipal tax authorities in Brazil |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible loss |  |  |  |  | $ 12.2 | R$ 49.1

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