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Commitments and Contingencies - Legal, Tax, and Other Matters (Details) - Dec. 31, 2017 R$ in Millions, $ in Millions, ₩ in Billions | USD ($) | BRL (R$) | KRW (₩)
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South Koria (SRTO) | Assessment |  |  |
Loss Contingencies [Line Items] |  |  |
Estimate of possible loss | $ 10.6 |  | ₩ 11.9
South Koria (SRTO) | Pre-assessment |  |  |
Loss Contingencies [Line Items] |  |  |
Estimate of possible loss | 17.9 |  | ₩ 20.1
Federal, state and municipal tax authorities in Brazil | Assessment |  |  |
Loss Contingencies [Line Items] |  |  |
Estimate of possible loss | $ 13.7 | R$ 52.4 |

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